Cal. Health & Safety Code § 1372

Subject to the applicable provisions of this chapter, a plan may offer one or more plan contracts or specialized health care service plan contracts, except that a specialized health care service plan contract shall not offer one or more basic health care services except as may be permitted by rule or order of the director. Advertising, disclosure forms, contract forms, and evidences of coverage for more than one type of plan contract or specialized health care service plan contract, or both, may not be used except as authorized by the director pursuant to this chapter.