Cal. Code of Civil Procedure § 2032.650

(a) If a party who has demanded and received delivery of medical reports under Section 2032.610 fails to deliver existing or later reports of previous or subsequent examinations under Section 2032.640, a party who has complied with Section 2032.610 may move for an order compelling delivery of medical reports. This motion shall be accompanied by a meet and confer declaration under Section 2016.040. (b) The court shall impose a monetary sanction under Chapter 7 (commencing with Section 2023.010) against any party, person, or attorney who unsuccessfully makes or opposes a motion to compel delivery of medical reports under this section, unless it finds that the one subject to the sanction acted with substantial justification or that other circumstances make the imposition of the sanction unjust. (c) If a party then fails to obey an order compelling delivery of medical reports, 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). In lieu of or in addition to the sanction, the court may impose a monetary sanction under Chapter 7 (commencing with Section 2023.010). The court shall exclude at trial the testimony of any health care practitioner whose report has not been provided by a party ordered to do so by the court.