California Code, Business and Professions Code - BPC § 2395.5

(1) Consideration in any form was provided to the licensee for serving, or the licensee was required to serve, on an on-call basis to the hospital emergency room. In either event, the protections of subdivision (a) shall not apply unless the hospital expressly, in writing, accepts liability for the licensee's negligent acts or omissions.

(2) The licensee had provided prior medical diagnosis or treatment to the same patient for a condition having a bearing on or relevance to the treatment of the obstetrical condition which required emergency services.

(3) Before rendering emergency obstetrical services, the licensee had a contractual obligation or agreement with the patient, another licensee, or a third-party payer on the patient's behalf to provide obstetrical care for the patient, or the licensee had a reasonable expectation of payment for the emergency services provided to the patient.