Cal. CIV § 43.96

(a) Any medical or podiatric society, health facility licensed or certified under Division 2 (commencing with Section 1200) of the Health and Safety Code, state agency as defined in Section 11000 of the Government Code, or local government agency that receives written complaints related to the professional competence or professional conduct of a physician and surgeon or doctor of podiatric medicine from the public shall inform the complainant that the Medical Board of California or the California Board of Podiatric Medicine, as the case may be, is the only authority in the state that may take disciplinary action against the license of the named licensee, and shall provide to the complainant the address and toll-free telephone number of the applicable state board.

(b) The immunity provided in Section 2318 of the Business and Professions Code and in Section 47 shall apply to complaints and information made or provided to a board pursuant to this section.