Cal. Health & Safety Code § 11217.5

Notwithstanding the provisions of Section 11217, a licensed physician and surgeon may treat a person with substance use disorder for addiction in any office or medical facility which, in the professional judgment of the physician and surgeon, is medically proper for the rehabilitation and treatment of the person. A licensed physician and surgeon may administer to a person with substance use disorder, under their direct care, those medications and therapeutic agents which, in the judgment of the physician and surgeon, are medically necessary, provided that nothing in this section shall authorize the administration of any narcotic drug.