Legal Glossary for California PI.

Overview

Plain-language definitions of the legal, medical, and insurance terms you will encounter in a California personal injury case.

A

Abuse of Process

: The misuse of legal process for an improper purpose, such as filing a lawsuit solely to harass or coerce a settlement. Distinguished from malicious prosecution, which involves filing without probable cause.

Accident Reconstruction

: The scientific analysis of a collision or incident using physical evidence, mathematics, and engineering principles to determine how and why it occurred. Accident reconstructionists often serve as expert witnesses in auto accident cases.

Accrual (of Cause of Action)

: The point at which a plaintiff's right to file a lawsuit begins. Under California law, a cause of action generally accrues when the plaintiff suffers injury. The statute of limitations begins running from the date of accrual. See Key California Statutes.

Actual Damages

: See compensatory damages. The real, measurable losses suffered by a plaintiff, as opposed to nominal or punitive damages.

Additur

: A court's increase of a jury's damages award when the court determines the award was inadequate as a matter of law. The opposite of remittitur. Rarely granted in California.

Adjuster

: An insurance company employee or independent contractor who investigates, evaluates, and negotiates insurance claims. See also claims adjuster.

Admission

: A statement or acknowledgment by a party that a particular fact is true. Admissions can be made in pleadings, discovery (requests for admission under CCP 2033.010), or during testimony.

ADR (Alternative Dispute Resolution)

: Methods of resolving disputes outside of court, including mediation, arbitration, and settlement conferences.

Affidavit

: A written statement of facts made under oath or penalty of perjury. In California, most affidavits have been replaced by declarations under CCP 2015.5.

Affirmative Defense

: A defense raised by the defendant that, even if the plaintiff's allegations are true, provides a legal excuse or justification. Common PI affirmative defenses include comparative fault, assumption of risk, and statute of limitations.

Agent

: A person authorized to act on behalf of another (the principal). In PI cases, agency relationships are critical for establishing vicarious liability (respondeat superior).

Aggravation of Pre-existing Condition

: The worsening of a medical condition that existed before the incident. Under California law, a defendant is liable for any aggravation of a pre-existing condition, even if the plaintiff was already symptomatic. See CACI 3927.

Allegations

: The claims or assertions made by a party in a pleading, such as a complaint or answer.

Alternative Liability

: A doctrine allowing a plaintiff to shift the burden of proof on causation to multiple defendants when each acted negligently but only one caused the injury, and the plaintiff cannot determine which one. See Summers v. Tice (1948) 33 Cal.2d 80.

Ambulance Chasing

: The unethical solicitation of legal business from accident victims, prohibited under California Rules of Professional Conduct Rule 7.3 and Bus. & Prof. Code 6152.

Answer

: The defendant's formal written response to a complaint, admitting or denying each allegation and asserting affirmative defenses.

Anti-SLAPP Motion

: A special motion to strike under CCP 425.16, designed to dismiss lawsuits that arise from protected free speech or petition activity. The defendant must show the claims arise from protected activity; the plaintiff must then show a probability of prevailing.

Apportionment

: The allocation of fault or damages among multiple parties. In California, Proposition 51 (CC 1431.2) apportions non-economic damages based on each defendant's percentage of fault. See Comparative Fault.

Arbitration

: A form of ADR where a neutral third party (arbitrator) hears evidence and renders a binding or non-binding decision. Common in UM/UIM disputes per Insurance Code 11580.2.

Assumption of Risk

: A defense asserting that the plaintiff voluntarily encountered a known danger. California recognizes primary assumption of risk (complete bar, no duty owed) and secondary assumption of risk (a form of comparative fault). See Knight v. Jewett (1992) 3 Cal.4th 296.

Attractive Nuisance

: A dangerous condition on property that is likely to attract children. Property owners owe a heightened duty of care to child trespassers regarding such conditions. See Civ. Code 847; Restatement (Second) of Torts 339.

B

Bad Faith

: An insurer's unreasonable failure to fulfill its obligations to its insured, including unreasonable denial of claims, delay in payment, or failure to investigate. Gives rise to tort damages. See Key California Statutes -- Insurance Code and Important Case Law.

Bates Numbering

: A sequential numbering system applied to documents produced in discovery for identification and reference purposes. Format typically: PLAINTIFF000001, DEF000001, etc.

Battery

: An intentional, harmful, or offensive touching of another person without consent. A battery claim in PI can arise from physical assaults or, in medical contexts, treatment performed without informed consent.

Bench Trial

: A trial before a judge without a jury. Either party in a California civil case may demand a jury trial; otherwise, the case is tried to the bench.

Billing Rate vs. Paid Rate

: In PI, the distinction between the amount a medical provider bills (the "chargemaster" or retail rate) and the amount actually paid or accepted as payment. Critical under Howell v. Hamilton Meats (2011) 52 Cal.4th 541 for calculating medical specials. See Economic Damages.

Biomechanics

: The study of the mechanics of movement and forces on the human body. Biomechanical engineers testify about the forces involved in an incident and their relationship to the claimed injuries.

Bodily Injury (BI)

: An insurance term referring to physical harm to a person. BI coverage in liability policies pays for damages the insured is legally obligated to pay for injuries to others.

Breach of Duty

: The failure to exercise the standard of care that a reasonably prudent person would have exercised under the same circumstances. The second element of a negligence claim, after duty of care. See Duty of Care.

Burden of Proof

: The obligation to prove facts in dispute. In most PI cases, the plaintiff bears the burden by a preponderance of the evidence. For punitive damages, the standard is clear and convincing evidence.

C

CACI (California Civil Jury Instructions)

: The standard jury instructions approved by the California Judicial Council for use in civil trials. CACI instructions are the primary source for jury charges in PI cases. Key series include 400 (negligence), 1200 (products liability), and 3900 (damages).

Carrier

: The insurance company providing coverage under an insurance policy. Also called the insurer.

Case-in-Chief

: The main portion of a party's presentation of evidence at trial. The plaintiff presents their case-in-chief first, followed by the defendant.

Causation

: The element of a tort claim requiring the plaintiff to prove that the defendant's conduct was a cause of the plaintiff's injuries. California uses the substantial factor test (CACI 430, 431) rather than the traditional "but for" test. Includes both cause-in-fact and proximate cause (legal cause).

Cause of Action

: A legal theory on which a lawsuit is based. A single complaint may contain multiple causes of action (e.g., negligence, strict liability, breach of warranty).

Cervical

: Relating to the neck region of the spine (C1-C7 vertebrae). Cervical injuries are among the most common in auto accident cases.

Cervical Radiculopathy

: Nerve root compression in the cervical spine causing pain, numbness, tingling, or weakness radiating into the arms and hands. Often diagnosed with MRI and EMG/NCV studies.

Chiropractic

: A healthcare discipline focused on the diagnosis and treatment of musculoskeletal disorders, particularly spinal manipulation. Chiropractic treatment is common in PI cases but may be scrutinized by defense for over-treatment.

Chronic Pain Syndrome

: A condition where pain persists beyond the expected healing time, often becoming a diagnosis in its own right. Relevant to non-economic damages and future medical needs.

Claim

: A demand for compensation or assertion of a right. In PI, this refers to both the administrative insurance claim and the legal cause of action.

Claims Adjuster

: See adjuster. The insurance professional responsible for evaluating and resolving claims.

Clear and Convincing Evidence

: A standard of proof higher than preponderance of the evidence but lower than "beyond a reasonable doubt." Required for punitive damages under Civil Code 3294. See Key California Statutes.

Closing Argument

: The final statements made by attorneys to the jury (or judge in a bench trial) summarizing the evidence and arguing why a verdict should be entered in their client's favor.

COBRA

: The Consolidated Omnibus Budget Reconciliation Act, a federal law allowing employees to continue employer-sponsored health insurance after job loss. Relevant to PI damages when a plaintiff loses employment and health benefits due to injury.

Collateral Source Rule

: The rule preventing a defendant from reducing damages based on the plaintiff's receipt of compensation from independent sources (e.g., insurance). In California, see Civ. Code 3333.1 (medical malpractice exception) and Howell v. Hamilton Meats. See Collateral Source Rule.

Comparative Fault

: California's system of apportioning fault among all parties, including the plaintiff. Under Li v. Yellow Cab Co. (1975) 13 Cal.3d 804, California adopted pure comparative fault, meaning a plaintiff's recovery is reduced by their percentage of fault but not eliminated. See Comparative Fault.

Compensatory Damages

: Damages intended to make the plaintiff whole by compensating for actual losses. Includes both economic damages (medical bills, lost wages) and non-economic damages (pain and suffering). See Economic Damages.

Complaint

: The initial pleading filed by the plaintiff to commence a lawsuit, setting forth the facts and legal theories supporting the claims.

Compulsory Cross-Complaint

: Under CCP 426.30, a defendant must assert any related cause of action against the plaintiff in a cross-complaint in the same action or lose it.

Concussion

: A mild traumatic brain injury (mTBI) caused by a blow to the head or violent shaking. Symptoms include headache, confusion, memory problems, and dizziness.

Contingency Fee

: A fee arrangement where the attorney's compensation is a percentage of the recovery, paid only if the case is successful. Standard in California PI practice. Governed by Rules of Professional Conduct 1.5.

Contribution

: The right of one tortfeasor who has paid more than their share of a judgment to recover the excess from other responsible parties. See CCP 875-880 (equitable contribution among joint tortfeasors).

Contusion

: A bruise; an injury where blood vessels are damaged beneath the skin or within tissue without a break in the skin surface.

Conversion

: The intentional tort of exercising unauthorized control over another person's personal property. Can arise in PI contexts involving property damage or theft.

Corroborating Evidence

: Evidence that supports or strengthens other evidence. Important in PI to corroborate subjective complaints with objective medical findings.

Cost Bill

: A memorandum of costs filed after judgment to recover litigation expenses. Governed by CCP 1032-1034 and California Rules of Court 3.1700.

Cross-Complaint

: A claim filed by a defendant against the plaintiff, a co-defendant, or a third party within the same lawsuit.

Cross-Examination

: The questioning of a witness by the opposing party after direct examination. A critical skill in PI litigation for challenging defense medical examiners and adverse witnesses.

CT Scan (Computed Tomography)

: A diagnostic imaging test using X-rays and computer processing to create detailed cross-sectional images of the body. Commonly used to identify fractures, internal bleeding, and organ damage in PI cases.

D

Damages

: The monetary compensation sought or awarded to a plaintiff for injuries and losses caused by the defendant. Categories include economic damages, non-economic damages, and punitive damages. See Economic Damages.

Day-in-the-Life Video

: A documentary-style video showing the plaintiff's daily challenges, limitations, and struggles resulting from their injuries. A powerful demonstrative exhibit for trial. Admissibility governed by Evid. Code 352.

Declaration

: A written statement of facts made under penalty of perjury under California law (CCP 2015.5). Functionally equivalent to an affidavit but does not require notarization.

Decubitus Ulcer

: A pressure sore or bedsore caused by prolonged pressure on the skin. Common in elder abuse and nursing home negligence cases. Staging: I (redness), II (partial skin loss), III (full skin loss), IV (tissue destruction to bone/muscle).

Default Judgment

: A judgment entered against a defendant who fails to respond to a complaint within the required time. CCP 585.

Defendant

: The party against whom a lawsuit is brought.

Degenerative Disc Disease (DDD)

: Age-related wear and tear on the spinal discs. A common pre-existing condition defense argument in PI cases. Important to establish aggravation through before-and-after imaging.

Demand Letter

: A written communication from the plaintiff's attorney to the defendant or insurer setting forth the claim, supporting evidence, and a monetary demand for settlement. See Practice Checklists.

Demonstrative Evidence

: Evidence used to illustrate or explain other evidence, such as charts, diagrams, models, animations, or medical illustrations. Not independently admitted as substantive evidence.

De Novo

: "Anew" or "from the beginning." A de novo trial or review starts fresh without regard to prior proceedings.

Deposition

: Sworn testimony taken outside of court, typically in an attorney's office, recorded by a court reporter. Used for discovery, witness preservation, and impeachment. Governed by CCP 2025.010 et seq. See Practice Checklists.

Dermatomal Pattern

: The area of skin supplied by a single spinal nerve root. Pain, numbness, or tingling following a dermatomal pattern supports a diagnosis of nerve root compression (radiculopathy).

Diminished Value

: The reduction in a vehicle's market value after being repaired from collision damage. Recoverable as property damages in California.

Directed Verdict

: A judgment entered by the court during trial, before the case goes to the jury, when the opposing party has failed to present sufficient evidence. In California civil practice, this is a motion for nonsuit (CCP 581c) or a motion for judgment (CCP 630).

Disc Bulge

: A broad-based extension of disc material beyond the normal margins of the intervertebral disc space. Less severe than a disc herniation and may be age-related.

Disc Herniation

: A condition where the soft inner material (nucleus pulposus) of an intervertebral disc pushes through the tougher outer ring (annulus fibrosus). Can compress nearby nerves causing pain, numbness, and weakness. Commonly diagnosed with MRI.

Discovery

: The pre-trial process by which parties obtain evidence and information from each other and third parties. Includes interrogatories, requests for production, requests for admission, depositions, and subpoenas. Governed by CCP 2016.010 et seq. See Practice Checklists.

Discography (Discogram)

: A diagnostic procedure involving injection of contrast dye into a spinal disc to determine if the disc is the source of back pain. Somewhat controversial and increasingly replaced by MRI studies.

Doe Defendants

: Fictitious defendants named in a complaint when the plaintiff does not yet know their true identity. California permits naming up to 50 Doe defendants under CCP 474. Doe amendments permitted under CCP 474 when true identity is discovered.

Dram Shop Liability

: The liability of an establishment that serves alcohol to an intoxicated person who then causes injury to a third party. California generally does not recognize dram shop liability for adults (Bus. & Prof. Code 25602), but liability exists for serving minors (Bus. & Prof. Code 25602.1).

Durable Medical Equipment (DME)

: Medical equipment prescribed for long-term home use, such as wheelchairs, hospital beds, braces, and CPAP machines. Costs are recoverable as economic damages.

Duty of Care

: The legal obligation to exercise reasonable care to prevent foreseeable harm to others. Established by Civ. Code 1714(a) and analyzed under the Rowland factors. See Duty of Care.

E

Economic Damages

: Objectively verifiable monetary losses, including medical expenses, lost wages, loss of earning capacity, property damage, and household services. Not subject to a cap in standard PI cases (capped in medical malpractice under MICRA). See Economic Damages.

Eggshell Plaintiff Rule

: The principle that a defendant takes the plaintiff as they find them, including pre-existing conditions and vulnerabilities. A defendant is liable for the full extent of the plaintiff's injuries even if a normal person would not have been injured as severely. See CACI 3927.

Elder Abuse

: Physical abuse, neglect, financial exploitation, or abandonment of a person 65 years or older. California's Elder Abuse and Dependent Adult Civil Protection Act (Welf. & Inst. Code 15600 et seq.) provides enhanced remedies including attorney fees and punitive damages. See Key California Statutes.

Electroneuromyography

: See EMG/NCV.

EMG/NCV (Electromyography / Nerve Conduction Velocity)

: Diagnostic tests that measure electrical activity in muscles (EMG) and the speed of nerve signal conduction (NCV). Used to diagnose nerve damage, radiculopathy, carpal tunnel syndrome, and other neurological conditions.

Emotional Distress

: Mental suffering, including anxiety, fear, grief, depression, and humiliation. Recoverable as non-economic damages. May be the basis of an independent tort claim: intentional infliction of emotional distress (IIED) or negligent infliction of emotional distress (NIED).

Epidural Steroid Injection (ESI)

: A minimally invasive procedure injecting corticosteroid medication into the epidural space of the spine to reduce inflammation and relieve pain. Common treatment in PI cases for disc herniations and radiculopathy.

ERISA (Employee Retirement Income Security Act)

: A federal law governing employee benefit plans, including health insurance. ERISA plans have subrogation rights that are generally not subject to the common fund doctrine, making lien resolution more complex.

Essential Factual Elements

: The facts that a plaintiff must prove to establish each cause of action. Listed in the relevant CACI instructions.

Evidence Code

: The California Evidence Code, governing the admissibility of evidence in court proceedings. Key sections for PI include 352 (undue prejudice), 1115-1128 (mediation confidentiality), 1152 (settlement offers), 1157 (peer review privilege). See Key California Statutes.

Excess Verdict

: A jury award that exceeds the applicable insurance policy limits, exposing the defendant personally. Creates potential bad faith liability for the insurer if it unreasonably failed to settle within limits.

Exclusion

: A provision in an insurance policy that eliminates coverage for specified risks, conditions, or circumstances.

Exemplary Damages

: See punitive damages.

Expert Witness

: A person with specialized knowledge, skill, experience, or education who is permitted to testify in the form of opinions. Governed by Evid. Code 720. Expert designation and discovery governed by CCP 2034.210 et seq.

F

Facet Joint

: Small stabilizing joints located between and behind adjacent vertebrae in the spine. Facet joint injuries and inflammation are common in whiplash injuries and can cause chronic pain.

Failure to Warn

: A products liability theory holding a manufacturer liable for injuries caused by inadequate warnings about a product's risks. Evaluated under both strict liability and negligence. See Anderson v. Owens-Corning Fiberglas Corp. (1991) 53 Cal.3d 987.

Fair Market Value

: The price that a willing buyer would pay a willing seller for property in an arm's-length transaction. The measure of property damage for destroyed vehicles.

FEHA (Fair Employment and Housing Act)

: California Government Code 12900 et seq. Prohibits discrimination and harassment in employment and housing. Relevant when PI intersects with workplace injury claims.

Fiduciary Duty

: A heightened legal duty of care, trust, and loyalty owed by one party to another. Insurance companies owe a quasi-fiduciary duty to their insureds when handling claims.

Flexion-Extension Injury

: See whiplash.

FMLA/CFRA

: The federal Family and Medical Leave Act and California Family Rights Act, providing eligible employees with job-protected leave for medical conditions. Relevant to PI damages calculations for lost employment.

Foreseeability

: The reasonable anticipation that harm may result from certain acts or omissions. A key factor in both duty of care and proximate cause analysis. See Duty of Care.

Form Interrogatories

: Standardized discovery questions approved by the Judicial Council (Form DISC-001). In PI cases, key form interrogatories address the incident, injuries, damages, insurance, and witnesses.

Fracture

: A break in a bone. Types commonly seen in PI include: simple (clean break), compound/open (bone breaks through skin), comminuted (bone shattered into pieces), compression (vertebral body collapse), stress (hairline), and avulsion (bone fragment pulled away by tendon/ligament).

Fraud

: Intentional misrepresentation of a material fact, made with knowledge of its falsity, intended to induce reliance, and causing damages. Can arise in insurance contexts (insurance fraud) or as an independent cause of action.

G

General Damages

: See non-economic damages. Damages that do not have a precise monetary value, such as pain and suffering and emotional distress.

Glasgow Coma Scale (GCS)

: A neurological scale used to assess a patient's level of consciousness after brain injury. Scores range from 3 (deep coma) to 15 (fully alert). Used to classify TBI severity: mild (13-15), moderate (9-12), severe (3-8).

Good Faith Settlement

: A settlement between the plaintiff and one or more defendants that is made in good faith. A defendant who settles in good faith is entitled to a bar order protecting them from contribution claims by other defendants. Governed by CCP 877.6. See Tech-Bilt, Inc. v. Woodward-Clyde & Associates (1985) 38 Cal.3d 488.

Government Claim

: A prerequisite to suing a California government entity, requiring the claimant to file an administrative claim within six months of the incident (Gov. Code 911.2). Failure to file a timely government claim generally bars the lawsuit. See Key California Statutes.

Government Code Immunity

: Statutory provisions protecting government entities and employees from liability. California follows the rule that government entities are immune from liability except where a statute imposes liability. Gov. Code 815.

Guardian Ad Litem

: A person appointed by the court to represent the interests of a minor or incompetent person in a lawsuit. Required for settlements involving minors under CCP 372.

H

Hearsay

: An out-of-court statement offered to prove the truth of the matter asserted. Generally inadmissible under Evid. Code 1200, subject to numerous exceptions (business records 1271, medical records 1271, party admissions 1220, etc.).

Herniated Disc

: See disc herniation.

HIPAA (Health Insurance Portability and Accountability Act)

: Federal law governing the privacy and security of protected health information (PHI). Requires patient authorization before medical records can be released. Standard HIPAA authorizations are obtained during intake.

Hit and Run

: A traffic collision where a driver flees the scene without providing identification or rendering aid. A criminal offense under Vehicle Code 20001-20003. Triggers UM coverage for the injured party.

Hospital Lien

: A lien filed by a hospital against a personal injury settlement or judgment for the reasonable and necessary charges of the patient's care. Governed by Civ. Code 3045.1-3045.6.

Hostile Witness

: A witness who is antagonistic or uncooperative during examination. A party may request the court declare a witness hostile, allowing leading questions on direct examination. Evid. Code 776.

Howell

: Shorthand for Howell v. Hamilton Meats & Provisions, Inc. (2011) 52 Cal.4th 541, the landmark California Supreme Court case holding that a plaintiff's recoverable medical damages are limited to amounts actually paid or incurred, not the full billed amount. See Economic Damages.

Hypothetical Question

: A question posed to an expert witness that asks the expert to assume certain facts and render an opinion based on those assumptions. A standard method of eliciting expert testimony. Evid. Code 802.

I

IME (Independent Medical Examination)

: A medical examination of the plaintiff conducted by a physician selected by the defense. In California, more accurately called a DME (Defense Medical Examination). Governed by CCP 2032.020. The plaintiff's attorney may have an observer present.

Impeachment

: The process of challenging a witness's credibility through prior inconsistent statements, bias, character evidence, or contradictory evidence.

Implied Consent

: Consent inferred from a person's actions or circumstances rather than expressed verbally or in writing. In medical contexts, implied consent may apply in emergencies when the patient is unable to consent.

Indemnity

: The obligation of one party to compensate another for a loss. Equitable indemnity allows one tortfeasor to shift liability to another based on relative fault. See American Motorcycle Assn. v. Superior Court (1978) 20 Cal.3d 578.

Independent Contractor

: A person who performs work for another but is not an employee. The hiring entity is generally not vicariously liable for the negligence of an independent contractor, subject to numerous exceptions (nondelegable duties, peculiar risk doctrine).

Informed Consent

: A patient's voluntary agreement to a medical procedure after being informed of the risks, benefits, alternatives, and consequences of refusing treatment. Failure to obtain informed consent can give rise to a medical malpractice claim or a battery claim.

Injunction

: A court order requiring a party to do or refrain from doing a specific act.

Insurance Bad Faith

: See bad faith.

Insurance Code

: The California Insurance Code, governing insurance companies and policies. Key PI sections include 11580 (minimum coverage), 11580.2 (UM/UIM), and various bad faith provisions. See Key California Statutes.

Intentional Infliction of Emotional Distress (IIED)

: A tort claim requiring proof that the defendant's extreme and outrageous conduct intentionally or recklessly caused the plaintiff severe emotional distress. Higher threshold than NIED.

Interrogatories

: Written questions served on a party in litigation that must be answered under oath. Includes form interrogatories and special interrogatories. CCP 2030.010 et seq.

Intervertebral Disc

: The fibrocartilage cushion between vertebrae in the spine. Composed of a tough outer layer (annulus fibrosus) and soft inner core (nucleus pulposus). Common site of injury in PI (see disc bulge, disc herniation).

J

Joint and Several Liability

: The principle that each defendant may be held liable for the entire amount of economic damages, regardless of their percentage of fault. Modified in California by Proposition 51 for non-economic damages only. See Comparative Fault.

Judgment

: The final decision of a court in a lawsuit, determining the rights and obligations of the parties.

Judgment Notwithstanding the Verdict (JNOV)

: A judgment entered by the court overriding the jury's verdict when no reasonable jury could have reached the verdict. CCP 629.

Jury Instructions

: The legal principles and rules provided to the jury by the judge to guide their deliberations. California uses CACI for civil cases.

K

Kyphoplasty

: A minimally invasive spinal procedure to treat vertebral compression fractures by inflating a balloon to create space and then filling it with bone cement. A form of vertebroplasty.

Kyphosis

: An excessive outward curvature of the thoracic spine, creating a hunched or rounded back appearance. Can result from compression fractures or degenerative conditions.

L

Laminectomy

: A surgical procedure to remove part of the vertebral bone (lamina) to relieve pressure on the spinal cord or nerves. A common surgical treatment for spinal stenosis or severe disc herniation.

Letter of Protection (LOP)

: An agreement between a plaintiff's attorney and a medical provider in which the attorney guarantees payment from the case proceeds in exchange for the provider treating the plaintiff on a deferred-payment basis. Also called a lien.

Liability

: Legal responsibility for one's acts or omissions. In PI, the defendant's liability is the threshold question before damages are assessed.

Lien

: A legal claim on a settlement or judgment for the payment of a debt. In PI, liens commonly arise from medical providers, health insurers, MediCal, Medicare, workers' compensation carriers, and hospitals. See Practice Checklists.

Life Care Plan

: A comprehensive plan developed by a qualified professional (usually a registered nurse or rehabilitation counselor) projecting the plaintiff's future medical and non-medical needs and associated costs over their lifetime. Used in catastrophic injury cases.

Ligament

: A tough band of connective tissue connecting bones at a joint. Common ligament injuries in PI include ACL tears (knee), rotator cuff tears (shoulder), and ligamentous injuries in the cervical spine.

Litigation

: The process of resolving a dispute through the court system, including all proceedings from filing of the complaint through trial and any appeal.

Loss of Consortium

: A claim by the spouse (or domestic partner) of an injured plaintiff for the loss of companionship, affection, sexual relations, and society resulting from the injuries. A derivative claim under CACI 3920.

Loss of Earning Capacity

: The diminished ability to earn income in the future as a result of injuries. Distinguished from lost wages (actual past earnings lost). Does not require proof of actual employment. See Economic Damages.

Lost Wages

: Income the plaintiff actually lost as a result of being unable to work due to injuries. Proven through employment records, tax returns, and employer verification. See Economic Damages.

Lumbar

: Relating to the lower back region of the spine (L1-L5 vertebrae). Lumbar injuries are extremely common in PI cases, particularly auto accidents.

M

Malingering

: The intentional fabrication or exaggeration of symptoms for secondary gain (such as a lawsuit or insurance payout). A common defense argument. Addressed through IME/DME findings and surveillance.

Malpractice

: See medical malpractice or legal malpractice.

Maxillofacial

: Relating to the jaw and face. Maxillofacial injuries are common in auto accidents and assaults and may require specialized surgical treatment.

Maximum Medical Improvement (MMI)

: The point at which a patient's condition has stabilized and is unlikely to improve further with additional treatment. A critical milestone for evaluating damages and preparing a demand letter.

Medial Branch Block

: A diagnostic injection of anesthetic near the medial branch nerves that supply a facet joint to determine if the facet joint is the source of pain. If effective, may be followed by radiofrequency ablation.

Mediation

: A form of ADR where a neutral mediator facilitates settlement negotiations between the parties. Mediation communications are confidential under Evid. Code 1115-1128.

Mediation Brief

: A written submission to the mediator summarizing a party's case, evidence, and settlement position. May be confidential (shared only with mediator) or shared with both sides.

MediCal

: California's Medicaid program providing health coverage to low-income individuals. MediCal has statutory lien rights against PI settlements under Welf. & Inst. Code 14124.70 et seq.

Medical Malpractice

: Professional negligence by a healthcare provider that causes injury to a patient. Subject to special rules in California under MICRA (Medical Injury Compensation Reform Act), including a cap on non-economic damages and shortened statute of limitations (CCP 340.5). See Key California Statutes.

Medical Specials

: The total amount of medical expenses incurred as a result of the injury. A key component of economic damages. Under Howell, limited to amounts actually paid or incurred.

Medicare

: The federal health insurance program for people age 65+, certain younger disabled persons, and people with end-stage renal disease. Medicare has strong subrogation rights under the Medicare Secondary Payer Act (42 USC 1395y). Medicare conditional payments must be repaid from PI settlements.

Medicare Set-Aside (MSA)

: A financial arrangement that allocates a portion of a settlement to pay for future medical care that would otherwise be covered by Medicare. Required in certain settlements to protect Medicare's interests.

Meniscus

: The C-shaped cartilage in the knee joint that acts as a shock absorber. Meniscus tears are common PI injuries, often requiring arthroscopic surgery.

MICRA (Medical Injury Compensation Reform Act)

: California's 1975 medical malpractice reform legislation, including a cap on non-economic damages (originally $250,000, increased by AB 35 effective 2023 to $350,000 for non-death cases, $500,000 for death cases, increasing annually through 2033), shortened statute of limitations (CCP 340.5), periodic payment of future damages, and limitations on contingency fees.

Minor's Compromise

: A court-approved settlement of a claim on behalf of a minor or incompetent person. Required under CCP 372 and Probate Code 3500-3502 and Cal. Rules of Court 7.950-7.955.

Mitigation of Damages

: The plaintiff's duty to take reasonable steps to minimize their losses after an injury. Failure to mitigate (e.g., refusing recommended medical treatment) can reduce the plaintiff's recovery. CACI 3930.

Motion for Summary Judgment/Adjudication

: A pre-trial motion arguing that there are no disputed material facts and the moving party is entitled to judgment as a matter of law. CCP 437c.

Motion in Limine

: A pre-trial motion seeking to exclude (or include) specific evidence at trial. Filed before trial to resolve evidentiary disputes outside the jury's presence.

Motion to Compel

: A discovery motion asking the court to order the opposing party to respond to discovery requests or to provide further responses. CCP 2030.300 (interrogatories), 2031.310 (document requests), 2033.290 (admissions).

MRI (Magnetic Resonance Imaging)

: A diagnostic imaging technique using strong magnetic fields and radio waves to produce detailed images of soft tissues, including the brain, spinal cord, muscles, ligaments, and intervertebral discs. The gold standard for diagnosing disc herniations, ligament tears, and soft tissue injuries.

Myofascial Pain

: Pain originating in the muscles and surrounding connective tissue (fascia), often characterized by trigger points. A common diagnosis in PI cases involving neck and back injuries.

N

Negligence

: The failure to exercise the degree of care that a reasonably prudent person would have exercised under the same or similar circumstances. The most common tort theory in PI cases. Elements: duty, breach, causation, damages. See Duty of Care.

Negligence Per Se

: A doctrine establishing that the violation of a statute or regulation constitutes negligence as a matter of law if the statute was designed to prevent the type of harm that occurred and the plaintiff is within the class of persons the statute was intended to protect. Evid. Code 669. See CACI 418.

Negligent Infliction of Emotional Distress (NIED)

: A negligence claim for emotional distress. In California, a bystander may recover under Thing v. La Chusa (1989) 48 Cal.3d 644 if they are closely related to the victim, present at the scene, and contemporaneously aware of the injury-producing event. A direct victim may recover if the defendant owed them a duty of care.

Nerve Conduction Velocity (NCV)

: See EMG/NCV.

No-Fault Insurance

: An insurance system where each party's own insurance pays for their losses regardless of fault. California is not a no-fault state; it follows the tort/fault system.

Non-Economic Damages

: Subjective, non-monetary losses including pain and suffering, emotional distress, loss of enjoyment of life, disfigurement, and inconvenience. Subject to apportionment under Proposition 51 but not subject to caps in standard PI (capped in medical malpractice under MICRA).

Nonsuit

: A judgment against the plaintiff entered when the plaintiff fails to present sufficient evidence to go to the jury. CCP 581c.

Notice of Lien

: A formal written notice filed by a medical provider, health insurer, or government entity asserting a claim against the plaintiff's recovery.

Nucleus Pulposus

: The gel-like center of an intervertebral disc. Herniation occurs when the nucleus pulposus extrudes through the annulus fibrosus.

O

Objective Findings

: Clinical or diagnostic findings that can be independently measured or observed (e.g., MRI results showing a herniated disc, X-ray showing a fracture). Contrasted with subjective complaints reported by the patient.

Offer of Judgment

: See CCP 998 Offer.

Opening Statement

: The initial statement made by each attorney at the beginning of a trial, outlining the facts and evidence they intend to present. Not argument; a preview of the evidence.

Orthopedics

: The medical specialty dealing with the musculoskeletal system, including bones, joints, muscles, tendons, and ligaments. Orthopedic surgeons and specialists are among the most common treaters in PI cases.

P

Pain and Suffering

: A category of non-economic damages compensating the plaintiff for physical pain and emotional suffering caused by their injuries. Calculated subjectively; common approaches include the per diem method and the multiplier method.

Paralegal

: A legal professional who assists attorneys with case preparation but cannot provide legal advice or represent clients. Critical team members in PI practice for case management, document organization, and discovery support.

Pebley

: Shorthand for Pebley v. Santa Clara Organics (2018) 22 Cal.App.5th 1266, which extended Howell to allow a plaintiff to present evidence of the full billed amount of medical expenses to show the reasonable value of services, even when less was paid. See Economic Damages.

Per Diem Argument

: A damages argument assigning a daily dollar value to the plaintiff's pain and suffering and multiplying by the number of days affected. A common strategy for quantifying non-economic damages for the jury.

Peremptory Challenge

: The right to dismiss a prospective juror during voir dire without stating a reason. Each side receives a limited number. CCP 231. Cannot be used to discriminate by race or gender (Batson/Wheeler).

Permanent Disability

: A lasting impairment that is not expected to improve further. Assessed through MMI determinations and disability ratings. Increases the value of non-economic damages and supports claims for loss of earning capacity and future medical needs.

Personal Injury Protection (PIP)

: Insurance coverage that pays for medical expenses and lost wages regardless of fault. California does not require PIP but does require MedPay to be offered.

Plaintiff

: The party who initiates a lawsuit by filing a complaint.

Pleadings

: The formal documents filed with the court by the parties, including the complaint, answer, cross-complaint, and demurrer.

PMK (Person Most Knowledgeable)

: A corporate deponent designated to testify on behalf of an entity regarding specified topics. The entity must designate the most qualified person for each topic. CCP 2025.230.

Policy Limits

: The maximum amount an insurance company will pay under a specific insurance policy. Relevant to settlement strategy; a policy limits demand is a demand for the full amount of available coverage.

Policy Limits Demand

: A formal demand letter seeking payment of the defendant's full insurance policy limits, often with a time-limited response period. Creates pressure on the insurer and may expose bad faith liability if unreasonably rejected.

Post-Concussion Syndrome

: A complex disorder involving persistent symptoms (headaches, dizziness, cognitive difficulties, mood changes) after a concussion/mTBI. Symptoms can last weeks to years.

Premises Liability

: The liability of a property owner or possessor for injuries occurring on their property due to dangerous conditions. Under California's Rowland framework, the general duty of care applies regardless of the plaintiff's status as invitee, licensee, or trespasser. See Duty of Care.

Preponderance of the Evidence

: The standard of proof in most civil cases, requiring the plaintiff to show that their version of the facts is more likely true than not. Sometimes described as "50% plus a feather."

Prognosis

: A medical opinion regarding the expected course and outcome of a patient's condition. Critical for establishing future damages.

Products Liability

: The liability of manufacturers, distributors, and retailers for injuries caused by defective products. California recognizes three theories: strict liability (manufacturing defect, design defect, failure to warn), negligence, and breach of warranty. See Important Case Law.

Proposition 51 (Several Liability for Non-Economic Damages)

: The 1986 ballot initiative (Civ. Code 1431.2) providing that each defendant is liable for non-economic damages only in proportion to their percentage of fault, while remaining jointly and severally liable for economic damages. See Comparative Fault.

Protective Order

: A court order limiting the disclosure or use of information obtained in discovery. Often sought by defendants to protect financial records, trade secrets, or proprietary information. CCP 2030.090.

Proximate Cause

: A legal concept limiting liability to consequences that are reasonably foreseeable. Also called "legal cause." Distinguished from cause-in-fact (substantial factor).

Punitive Damages

: Damages awarded to punish the defendant and deter similar conduct, beyond compensatory damages. Require proof of malice, oppression, or fraud by clear and convincing evidence under Civ. Code 3294. See Key California Statutes.

Q

Qualified Medical Examiner (QME)

: A physician certified by the California Division of Workers' Compensation to perform medical-legal evaluations. Relevant when PI cases have overlapping workers' compensation claims.

R

Radiculopathy

: Dysfunction of a spinal nerve root causing pain, weakness, numbness, or tingling in the areas served by that nerve. Cervical radiculopathy affects the arms; lumbar radiculopathy affects the legs (sciatica). Diagnosed with MRI and EMG/NCV studies.

Radiofrequency Ablation (RFA)

: A procedure using radio waves to heat and destroy nerve tissue, reducing pain signals from a specific area. Commonly used for facet joint pain after a positive medial branch block.

Range of Motion (ROM)

: The full movement potential of a joint, measured in degrees. Limited ROM is an objective finding supporting injury claims. Measured during physical examination and documented in medical records.

Remittitur

: A court's reduction of a jury's damages award when the court determines the award was excessive. The opposite of additur. More common than additur in California practice.

Request for Admission (RFA)

: A discovery device requiring the responding party to admit or deny specific facts or the genuineness of documents. CCP 2033.010 et seq. Failure to respond results in deemed admissions.

Request for Production of Documents (RPD)

: A discovery device requiring the responding party to produce specified documents, electronically stored information, or tangible things. CCP 2031.010 et seq.

Res Ipsa Loquitur

: "The thing speaks for itself." A doctrine allowing an inference of negligence when the injury is of a kind that ordinarily does not occur without negligence, the instrumentality was in the defendant's exclusive control, and the plaintiff did not contribute. Evid. Code 646.

Respondeat Superior

: "Let the master answer." The doctrine holding an employer vicariously liable for the torts of its employees committed within the scope of employment. See Hinman v. Westinghouse Elec. Co. (1970) 2 Cal.3d 956.

Retainer Agreement

: The written contract between attorney and client setting forth the terms of representation, including fee arrangement, scope of services, and obligations. Required to be in writing for contingency fees under Bus. & Prof. Code 6147.

ROM

: See Range of Motion.

Rotator Cuff

: A group of four muscles and their tendons that stabilize the shoulder joint. Rotator cuff tears are common PI injuries, particularly in falls and impacts. May require surgical repair (arthroscopic or open).

Rowland Factors

: The multi-factor balancing test from Rowland v. Christian (1968) 69 Cal.2d 108 used to determine whether to recognize or limit a duty of care. Factors include foreseeability, certainty of injury, connection between conduct and injury, moral blame, policy of preventing harm, burden on the defendant, consequences to the community, and insurance availability. See Duty of Care.

S

Scarring

: Permanent marks left on the skin after healing from a wound or surgery. A component of non-economic damages (disfigurement). Documented through photographs at various stages of healing.

Sciatica

: Pain radiating along the sciatic nerve from the lower back through the hip and buttock down the leg. Usually caused by lumbar disc herniation or spinal stenosis compressing the nerve root.

Scope of Employment

: The range of activities an employee is authorized to perform for the employer. Determines whether an employer is vicariously liable under respondeat superior. Includes authorized acts and acts incidental to employment.

Section 998 Offer

: See CCP 998 Offer.

Settlement

: An agreement between the parties to resolve a dispute without a trial or further litigation. In PI, typically involves a monetary payment in exchange for a release of claims.

Soft Tissue Injury

: An injury to muscles, ligaments, tendons, or other non-bony tissues. Includes sprains, strains, contusions, and whiplash injuries. Often challenged by defense as subjective or exaggerated because they may not appear on imaging.

Special Damages

: See economic damages. Damages that can be specifically calculated and documented.

Special Interrogatories

: Written discovery questions drafted by a party (as opposed to form interrogatories). Limited to 35 without a declaration of necessity. CCP 2030.030.

Special Verdict

: A verdict in which the jury answers specific factual questions rather than simply finding for the plaintiff or defendant. Common in PI trials and used with the corresponding CACI special verdict forms.

Spinal Cord Injury (SCI)

: Damage to the spinal cord resulting in loss of function, sensation, or mobility below the level of injury. Categories include complete (total loss) and incomplete (partial loss). Tetraplegia affects all four limbs; paraplegia affects the lower limbs.

Spinal Fusion

: A surgical procedure joining two or more vertebrae to eliminate motion between them. Used to treat severe disc disease, fractures, and instability. Types include anterior (ACDF), posterior, and lateral approaches.

Spinal Stenosis

: The narrowing of the spinal canal, which can compress the spinal cord or nerve roots. Often age-related but can be caused or aggravated by trauma. Symptoms include pain, numbness, and weakness.

Standard of Care

: The level of care, skill, and treatment that a reasonably competent healthcare provider would provide under similar circumstances. The benchmark for medical malpractice claims.

Statute of Limitations (SOL)

: The time period within which a lawsuit must be filed. In California PI, the general SOL is two years from the date of injury (CCP 335.1). Exceptions include one year for medical malpractice (CCP 340.5), six months for government claims (Gov. Code 911.2), and tolling for minors and incapacitated persons. See Key California Statutes.

Statute of Repose

: A fixed time limit measured from a specific event (like product manufacture or construction completion) after which no claim can be brought, regardless of when the injury occurred. Distinguished from statute of limitations (which runs from discovery/injury). See CCP 337.15 (construction -- 10 years).

Strict Liability

: Liability imposed without proof of negligence or fault. In California PI, strict liability applies to products liability (Greenman v. Yuba Power Products (1963) 59 Cal.2d 57), abnormally dangerous activities, and certain animal owner liability. See Important Case Law.

Structured Settlement

: A settlement paid through periodic payments over time rather than a lump sum. Funded by an annuity. Tax advantages under IRC 104(a)(2). Useful in catastrophic injury cases.

Subpoena

: A court order compelling a person to appear and testify (subpoena ad testificandum) or to produce documents (subpoena duces tecum). CCP 2020.010 et seq.

Subrogation

: The right of a party (typically an insurer) who has paid a loss to step into the shoes of the insured and recover from the responsible third party. See ERISA, MediCal, Medicare liens.

Subjective Complaints

: Symptoms reported by the patient that cannot be independently measured or observed (e.g., pain, dizziness, fatigue). Contrasted with objective findings.

Substantial Factor

: The causation standard in California negligence law. A defendant's conduct is a cause of the plaintiff's harm if it was a substantial factor in bringing about the harm. CACI 430, 431. Replaced the traditional "but for" test.

Summary Judgment

: See Motion for Summary Judgment/Adjudication.

Surveillance

: The monitoring and recording of a plaintiff's activities, typically by the defense, to detect exaggeration or inconsistency in claimed injuries. Legal if conducted in public places. Defense surveillance footage is subject to discovery.

Survival Action

: A cause of action that survives the death of the injured person and may be maintained by their personal representative. Under CCP 377.20-377.30, the decedent's estate can recover damages the decedent would have recovered had they survived (pre-death pain and suffering, medical expenses, lost earnings). Distinguished from wrongful death (which compensates the heirs for their own losses).

T

Tendon

: A tough cord of fibrous tissue connecting a muscle to a bone. Common PI tendon injuries include Achilles tendon rupture, rotator cuff tears, and tendinitis/tendinosis.

Thoracic

: Relating to the mid-back region of the spine (T1-T12 vertebrae).

TBI (Traumatic Brain Injury)

: Brain damage caused by external mechanical force. Classified as mild (concussion, GCS 13-15), moderate (GCS 9-12), or severe (GCS 3-8). Even mild TBI can cause lasting cognitive, emotional, and behavioral changes.

Tort

: A civil wrong, other than breach of contract, for which the law provides a remedy. Personal injury law is primarily concerned with torts.

Tortfeasor

: A person or entity who commits a tort.

Total Disability

: A disability that prevents the individual from performing any substantial gainful activity. Relevant to Social Security Disability and loss of earning capacity calculations.

Traumatic Brain Injury

: See TBI.

Treatment Gap

: A period of time during which the plaintiff did not receive medical treatment. Defense commonly argues that treatment gaps indicate the injuries are not as serious as claimed. Must be addressed and explained in the demand narrative.

Trigger Point Injection

: A procedure where medication (anesthetic, corticosteroid, or botox) is injected directly into a painful muscle trigger point to provide relief. Common treatment for myofascial pain.

Trust Account (IOLTA)

: A client trust account (Interest on Lawyer Trust Account) where settlement funds and client money are held separately from the firm's operating funds. Required under California Rules of Professional Conduct 1.15 and Bus. & Prof. Code 6211.

U

UCL (Unfair Competition Law)

: California's Business & Professions Code 17200 et seq., prohibiting unlawful, unfair, or fraudulent business acts or practices. Used in some PI contexts, particularly against insurance companies.

UM/UIM (Uninsured/Underinsured Motorist)

: Insurance coverage that pays for the insured's injuries when the at-fault driver has no insurance (UM) or insufficient insurance (UIM). Required to be offered in California under Ins. Code 11580.2. Disputes resolved by arbitration. See Key California Statutes.

Unconscionability

: A legal doctrine rendering a contract or contract term unenforceable because it is excessively one-sided. Relevant when challenging arbitration clauses or insurance policy provisions.

V

Vehicle Code

: The California Vehicle Code, governing the operation of motor vehicles. Key PI sections include 17150-17159.5 (owner liability), 22350 (basic speed law), 21453 (red light), 22107 (unsafe lane change), 23152-23153 (DUI), and 27315 (seatbelt). See Key California Statutes.

Venue

: The specific court or geographic location where a case is heard. In California PI, proper venue is generally where the injury occurred, where the defendant resides, or where the defendant's principal place of business is located. CCP 395.

Verdict

: The formal decision or finding made by a jury (or a judge in a bench trial) on the matters submitted to them.

Vertebroplasty

: A minimally invasive procedure injecting bone cement into a fractured vertebral body to stabilize it. See also kyphoplasty.

Vicarious Liability

: The imposition of liability on one party for the acts of another based on their relationship. Includes respondeat superior (employer-employee), parental liability, and vehicle owner liability (Veh. Code 17150).

Voir Dire

: The examination of prospective jurors by the court and attorneys to determine their qualifications and potential biases. CCP 222.5.

W

Wage Loss

: See lost wages.

Waiver

: The voluntary and intentional relinquishment of a known right. In PI, defenses may be waived if not timely raised.

Whiplash

: A neck injury caused by rapid back-and-forth movement of the head, commonly occurring in rear-end collisions. Technically termed "cervical acceleration-deceleration injury." Can involve injury to muscles, ligaments, discs, and nerves. A common soft tissue injury diagnosis.

Workers' Compensation

: The state-mandated insurance system providing benefits to employees injured on the job, regardless of fault. Workers' compensation is generally the exclusive remedy against the employer, but a PI claim may exist against third parties. Workers' comp liens must be resolved in PI settlements.

Wrongful Death

: A cause of action brought by the heirs (spouse, domestic partner, children, or dependents) of a person killed by the defendant's wrongful act or neglect. CCP 377.60 et seq. Distinguished from survival action. Damages include loss of financial support, loss of love and companionship, and funeral/burial expenses. See Key California Statutes.

X-Z

X-ray

: A diagnostic imaging test using radiation to produce images of bones and certain tissues. Useful for detecting fractures, dislocations, and degenerative changes. Does not show soft tissue detail (use MRI for soft tissue).

998 Offer (CCP 998)

: A statutory offer to compromise under Code of Civil Procedure section 998. If the offeree rejects a 998 offer and fails to obtain a more favorable result at trial, they may be subject to cost-shifting, including the opposing party's expert witness fees. A powerful settlement tool. See Key California Statutes.

Related Pages

• Key California Statutes -- Statutory citations referenced throughout this glossary
• Important Case Law -- Leading cases defining key legal concepts
• Practice Checklists -- Step-by-step workflows using these terms
• Duty of Care -- Deep dive on the foundational negligence element
• Comparative Fault -- California's pure comparative fault system
• Economic Damages -- Calculating and proving economic losses

Cross-References

• Trial Practice
• Evidence Rules
• Key California Statutes
• Leading Cases
• Practice Checklists
• Discovery

Common Questions

Sources & Legal Citations

1. California Code of Civil Procedure § 335.1. Two-year statute of limitations for personal injury.
2. California Civil Code § 1714(a). General duty of care standard.
3. Li v. Yellow Cab Co. (1975) 13 Cal.3d 804. California's pure comparative negligence system.
4. CACI 400 — Negligence Essential Factual Elements. Standard negligence instruction.
5. California Evidence Code § 1200. Hearsay definition and general rule.
6. California Government Code § 911.2. Government claims filing deadline.