Cal. Ins. Code § 10133.641
(a) A contract between a health insurer and a provider of health care services shall not contain any term that would result in termination or nonrenewal of the contract or otherwise penalize the provider, based solely on either of the following:
(b) A health insurer shall not discriminate, with respect to the provision of, or contracts for, professional services, against a licensed provider solely on the basis of either of the following: