California Code, Health and Safety Code - HSC § 1798.172

(a) The local EMS agency shall establish guidelines and standards for completion and operation of formal transfer agreements between hospitals with varying levels of care in the area of jurisdiction of the local EMS agency consistent with Sections 1317 to 1317.9a, inclusive, and Chapter 5 (commencing with Section 1798). Each local EMS agency shall solicit and consider public comment in drafting guidelines and standards. These guidelines shall include provision for suggested written agreements for the type of patient, initial patient care treatments, requirements of interhospital care, and associated logistics for transfer, evaluation, and monitoring of the patient.

(b) Notwithstanding subdivision (a), and in addition to Section 1317, a general acute care hospital licensed under Chapter 2 (commencing with Section 1250) of Division 2 shall not transfer a person for nonmedical reasons to another health facility unless that other facility receiving the person agrees in advance of the transfer to accept the transfer.