Cal. INS § 10112.6

(a) Consistent with federal law, a sponsor of a prescription drug plan authorized by the federal Medicare Prescription Drug, Improvement, and Modernization Act of 2003 (P.L. 108-173) shall hold a valid license as a life and disability insurer issued by the department or as a health care service plan issued by the Department of Managed Health Care. (b) An entity that is licensed as a life and disability insurer and that operates a prescription drug plan shall be subject to the provisions of this code, unless preempted by federal law.