Interrogatories in California PI Cases.

Overview

Interrogatories are written questions that the other side must answer under oath. They are one of the basic discovery tools in every personal injury case.

CCP 2030: Statutory Framework

Interrogatories are governed by CCP sections 2030.010 through 2030.410. Key provisions include:

Provision	CCP Section	Summary
Right to propound	2030.010	Any party may propound interrogatories to any other party
Form interrogatories	2030.020	Judicial Council approved; no limit on number
Special interrogatories	2030.030	Party-drafted; 35-limit without declaration
Content restrictions	2030.060	Must be full and complete; no preface or instructions exceeding one page
Response time	2030.260	30 days from service
Verification	2030.250	Responses must be verified under oath by the party
Supplemental interrogatories	2030.070	Permitted twice before trial setting; unlimited after

Form Interrogatories

Overview

Form interrogatories are Judicial Council-approved standardized questions that do not count toward the 35-interrogatory limit for special interrogatories. They are the most efficient way to obtain baseline information about the opposing party and their contentions.

Form Interrogatory Sets Available

Form Number	Title	Use
DISC-001	Form Interrogatories -- General	Standard in all civil cases
DISC-002	Form Interrogatories -- Limited Civil Cases	Cases under $35,000
DISC-003	Form Interrogatories -- Employment Law	FEHA and employment cases
DISC-004	Form Interrogatories -- Construction Litigation	Construction defect cases
DISC-005	Form Interrogatories -- Family Law	Not applicable to PI

Key Form Interrogatories for PI Cases (DISC-001)

Must-Use Form Interrogatories:

• 2.1-2.13 (Complaints): Prior and current medical complaints -- critical for preexisting conditions defense
• 4.1-4.2 (Insurance): Identity of all insurance policies that may cover the incident. This is often the most important interrogatory in the case.
• 6.1-6.7 (Incident): Detailed facts of the incident from the defendant's perspective
• 7.1-7.3 (Property Damage): Vehicle damage details and repair history
• 8.1-8.8 (Injuries): All injuries claimed, treatment history, and medical providers
• 9.1-9.2 (Other Damages): Loss of income, property damage, other economic losses
• 11.1-11.2 (Denials): Facts supporting each denial in the answer -- extremely powerful
• 12.1-12.7 (Affirmative Defenses): Facts supporting each affirmative defense
• 14.1-14.2 (Experts): Currently retained experts and their opinions
• 15.1 (Responses to RFAs): Facts, witnesses, and documents supporting each RFA response that was not an unqualified admission
• 16.1-16.10 (Defendant's Contentions): Contention interrogatories about the defendant's claims
• 17.1 (Supplemental): Supplemental response to identify additional facts and witnesses

Propounding Form Interrogatories

When serving form interrogatories:

• [ ] Check the appropriate boxes on the Judicial Council form
• [ ] Attach definitions and instructions (limited to one page of additional instructions)
• [ ] Include Form Interrogatory 15.1 whenever you serve RFAs
• [ ] Include Form Interrogatory 17.1 as a supplemental demand
• [ ] Do not modify the text of form interrogatories -- use special interrogatories for custom questions

Special Interrogatories

The 35-Interrogatory Limit

CCP 2030.030 limits each party to 35 specially prepared interrogatories per opposing party in a single set, without a supporting declaration. To propound more than 35:

• Attach a declaration of necessity under CCP 2030.050
• The declaration must state that the additional interrogatories are necessary and that the number propounded is consistent with the interest of justice
• The declaration must be based on the complexity of the case, not just the desire for more information

Drafting Effective Special Interrogatories

Principles of Good Interrogatory Drafting:

1. One topic per interrogatory: Keep each interrogatory focused on a single fact or issue
2. Use defined terms: Define key terms at the outset (INCIDENT, VEHICLE, SUBJECT PROPERTY) to avoid ambiguity objections
3. Be specific but not overly narrow: Broad enough to capture all responsive information, narrow enough to resist overbreadth objections
4. Avoid compound questions: Each interrogatory should ask for one category of information
5. Use the contention interrogatory strategically: Ask the opposing party to state all facts supporting specific contentions
6. Reference documents: Ask the party to identify documents that support or relate to specific facts
7. Target affirmative defenses: Draft specific interrogatories targeting each affirmative defense pled

Sample Special Interrogatories for PI Cases

Liability-Focused:

1. State ALL FACTS known to YOU that relate to the cause of the INCIDENT.
2. IDENTIFY each PERSON who witnessed any part of the INCIDENT.
3. State ALL FACTS that support YOUR contention that Plaintiff was negligent.
4. IDENTIFY all DOCUMENTS that relate to the maintenance or repair of [the VEHICLE/the PREMISES] in the TWO YEARS preceding the INCIDENT.
5. IDENTIFY each PERSON who inspected [the VEHICLE/the PREMISES] in the TWELVE MONTHS preceding the INCIDENT.

Damages-Related:

1. State ALL FACTS known to YOU that YOU contend demonstrate Plaintiff's injuries were preexisting.
2. IDENTIFY all surveillance conducted of Plaintiff, including dates, locations, and the PERSONS who conducted it.
3. State ALL FACTS that support YOUR contention that Plaintiff's medical treatment was unreasonable or unnecessary.

Procedural:

1. IDENTIFY all experts YOU have retained or consulted in connection with this litigation.
2. IDENTIFY all statements obtained from any witness to the INCIDENT.

Responding to Interrogatories

Response Requirements

Responses to interrogatories must be served within 30 days of service (plus additional time for mailing/electronic service). Each response must include:

1. A specific, complete, and straightforward answer to each interrogatory
2. An exercise of due diligence to obtain responsive information
3. Any objections stated with specificity, including the basis for each objection
4. A verification -- signed under oath by the party (not the attorney)

Common Objections to Interrogatories

Objection	When Proper	How to Overcome
Overbroad	No temporal or subject-matter limitation	Add reasonable time period or narrow scope
Vague and ambiguous	Terms genuinely unclear	Define terms in a definitions section
Compound	Multiple discrete questions in one interrogatory	Separate into individual questions
Burdensome and oppressive	Disproportionate effort relative to case value	Show proportionality -- damages justify the burden
Calls for legal conclusion	Asks for pure legal opinion	Reframe as contention interrogatory (factual basis)
Premature expert opinion	Asks for expert opinion before designation	Serve after expert designation deadline
Exceeds 35-limit	More than 35 without declaration	Include declaration of necessity or reduce count
Attorney-client privilege	Seeks privileged communications	Narrow to facts (not communications with counsel)
Work product	Seeks attorney's mental impressions	Narrow to facts known to the party

Responding on Behalf of Your Client

When preparing your client's interrogatory responses:

• [ ] Schedule a meeting with the client to go through each interrogatory
• [ ] Draft responses based on client input, medical records, and documents
• [ ] Ensure responses are consistent with prior statements, pleadings, and deposition testimony
• [ ] Assert objections where warranted but always provide substantive responses subject to and without waiving objections
• [ ] Verify that the response to each interrogatory is complete -- partial responses invite motions to compel
• [ ] Have the client review, correct, and verify the final responses under oath
• [ ] Maintain a copy of verified responses for impeachment preparation

Meet-and-Confer on Interrogatory Disputes

The Process

Before filing a motion to compel further responses to interrogatories, CCP 2030.300(b) requires a reasonable and good faith meet-and-confer effort. The process should include:

1. Written correspondence: Send a detailed letter identifying each deficient response and the specific reasons further response is required. Cite applicable code sections.
2. Telephone or in-person conference: Discuss each disputed response and attempt to reach agreement. Document the date, time, participants, and substance of the conference.
3. Follow-up correspondence: Confirm any agreements reached and identify any remaining disputes.
4. Allow reasonable time: Give the responding party at least 7-10 days to provide further responses before filing a motion.

The 45-Day Motion Deadline

Informal Discovery Conference

Many courts (especially LASC) require an Informal Discovery Conference (IDC) before hearing discovery motions. Check local rules and the assigned department's standing orders. Request the IDC promptly to preserve your ability to file a motion if the IDC does not resolve the dispute.

Supplemental Interrogatory Responses

Duty to Supplement

CCP 2030.310 imposes a continuing duty to supplement interrogatory responses when:

• The responding party obtains additional information that makes a prior response incomplete
• The responding party discovers that a prior response was incorrect

However, this duty applies only to information obtained after the initial responses were served. There is no obligation to conduct ongoing investigations.

Supplemental Interrogatories (CCP 2030.070)

Supplemental interrogatories are a separate discovery tool that asks the responding party to update all prior responses to include information discovered since the original responses. Key rules:

• A party may propound supplemental interrogatories twice before the initial trial date is set
• After the trial date is set, a party may propound supplemental interrogatories at any time, subject to the discovery cutoff
• Supplemental interrogatories do not count toward the 35-limit

Using Interrogatory Answers at Trial

Impeachment

Interrogatory responses signed under oath may be used to impeach a witness at trial. If the opposing party testifies inconsistently with their verified interrogatory responses, you may:

1. Confront the witness with the prior interrogatory response
2. Read the specific response into the record
3. Ask the witness to explain the inconsistency
4. Argue the inconsistency to the jury during closing

Admissions of a Party-Opponent

Under Evidence Code 1220, interrogatory responses are admissions of a party-opponent and may be introduced as substantive evidence at trial -- not just for impeachment. This means you can read interrogatory responses to the jury as affirmative evidence, even without calling the party as a witness.

Establishing Lack of Evidence

If the opposing party failed to identify facts, witnesses, or documents in their interrogatory responses, you can argue at trial that:

• They had a duty to disclose all responsive information
• Their failure to identify the evidence in discovery means it did not exist at the time
• Any newly raised evidence should be excluded as a discovery sanction or given reduced weight

Special Considerations in PI Cases

Plaintiff's Interrogatory Responses: Common Pitfalls

Pitfall	Problem	Prevention
Incomplete injury list	Defense argues undisclosed injuries are not claimed	List every injury, even minor ones
Vague treatment history	Defense argues treatment gaps mean recovery	Detailed chronological treatment timeline
Failure to disclose prior injuries	Devastating impeachment at trial	Full disclosure with explanation of differences
Inconsistent wage loss figures	Credibility attack on economic damages	Verify with tax returns and pay stubs before responding
Failure to update	New treating doctors or treatment not disclosed	Regular supplementation throughout the case

Defense Interrogatory Responses: What to Watch For

When reviewing the defendant's interrogatory responses, watch for:

• Boilerplate objections without substantive responses: Move to compel further responses
• Failure to identify witnesses: Seek order precluding undisclosed witnesses at trial
• Vague or evasive answers to contention interrogatories: Indicates weak defense positions
• Failure to identify facts supporting affirmative defenses: Basis for summary adjudication motion
• Failure to disclose insurance coverage: Follow up immediately -- CCP 2017.210 mandates disclosure

Related Pages

• Discovery -- Comprehensive California discovery guide
• Requests for Admission -- RFA strategy and the FI 15.1 combination
• Depositions -- Using interrogatory responses to prepare for depositions
• Law and Motion -- Motion to compel further responses
• Trial Practice -- Using interrogatory answers at trial
• Summary Judgment -- Using contention interrogatories to support opposition

Cross-References

• Discovery
• Depositions
• Requests for Admission
• Defense Medical Exams
• Evidence Rules
• Trial Practice

Common Questions

Sources & Legal Citations

1. California Code of Civil Procedure § 2030.010-2030.410. Interrogatory procedures and requirements.
2. California Code of Civil Procedure § 2030.030. Limit of 35 specially drafted interrogatories.
3. California Code of Civil Procedure § 2030.260. 30-day response deadline for interrogatories.
4. California Code of Civil Procedure § 2030.300. Motion to compel interrogatory responses.
5. California Code of Civil Procedure § 2030.070. Supplemental interrogatory responses.
6. California Rules of Court, Appendix — Form Interrogatories. Judicial Council approved form interrogatories.