Cal. PROB § 4731

(a) A supervising health care provider who knows of the existence of an advance health care directive, a revocation of an advance health care directive, or a designation or disqualification of a surrogate, shall promptly record its existence in the patient’s health care record and, if it is in writing, shall request a copy. If a copy is furnished, the supervising health care provider shall arrange for its maintenance in the patient’s health care record. (b) A supervising health care provider who knows of a revocation of a power of attorney for health care or a disqualification of a surrogate shall make a reasonable effort to notify the agent or surrogate of the revocation or disqualification.