California Code, Business and Professions Code - BPC § 2334

(a) Notwithstanding any other provision of law, with respect to the use of expert testimony in matters brought by the Medical Board of California, no expert testimony shall be permitted by any party unless the following information is exchanged in written form with counsel for the other party, as ordered by the Office of Administrative Hearings:

(b) The exchange of the information described in subdivision (a) shall be completed no later than 90 calendar days prior to the originally scheduled commencement date of the hearing, or as determined by an administrative law judge when Section 11529 of the Government Code applies.  Upon motion to extend the deadline based on a showing of good cause, the administrative law judge may extend the time for the exchange of information for a period not to exceed 100 calendar days cumulatively, but in no case shall the exchange take place less than 30 calendar days before the hearing date, whichever comes first.

(c) The Office of Administrative Hearings may adopt regulations governing the required exchange of the information described in this section.