Cal. Health & Safety Code § 1374.721
(c) In conducting utilization review involving level of care placement decisions or any other patient care decisions that are within the scope of the sources specified in subdivision (b), a health care service plan shall not apply different, additional, conflicting, or more restrictive utilization review criteria than the criteria and guidelines set forth in those sources. This subdivision does not prohibit a health care service plan from applying utilization review criteria to health care services and benefits for mental health and substance use disorders that meet either of the following criteria:
(e) To ensure the proper use of the criteria described in subdivision (b), every health care service plan shall do all of the following:
(f) The following definitions apply for purposes of this section:
(3) “Utilization review” means either of the following: