Cal. CCP § 93

(a) The plaintiff has the option to serve case questionnaires with the complaint, using forms approved by the Judicial Council. The questionnaires served shall include a completed copy of the plaintiff’s completed case questionnaire, and a blank copy of the defendant’s case questionnaire.

(b) Any defendant upon whom a case questionnaire is served shall serve a completed defendant’s case questionnaire upon the requesting plaintiff with the answer.

(c) The case questionnaire shall be designed to elicit fundamental information about each party’s case, including names and addresses of all witnesses with knowledge of any relevant facts, a list of all documents relevant to the case, a statement of the nature and amount of damages, and information covering insurance coverages, injuries and treating physicians. The Judicial Council shall design and develop forms for case questionnaires.

(d) Approved forms shall be made available by the clerk of the court.

(e) If a party on whom a case questionnaire has been served under subdivision (a) or (b) fails to serve a timely or a complete response to that questionnaire, the party serving the questionnaire may move for an order compelling a response or a further response and for a monetary sanction under Chapter 7 (commencing with Section 2023.010) of Title 4 of Part 4. If a party then fails to obey an order compelling a response or a further response, the court may make those orders that are just, including the imposition of an issue sanction, an evidence sanction, or a terminating sanction under Chapter 7 (commencing with Section 2023.010) of Title 4 of Part 4. In lieu of or in addition to that sanction, the court may impose a monetary sanction under Chapter 7 (commencing with Section 2023.010) of Title 4 of Part 4.