(a) For any insurance contracts entered into after January 1, 1990, where any private insurer, certified medical plan, or private health service plan is liable to pay or reimburse a professional provider or institutional provider for the costs of medically necessary mental health services provided to the patient, the costs of the clinical review required by Sections 6002.10 to 6002.40, inclusive, including, but not limited to, the costs of the interpreter, if any, and the costs of the patients' rights advocate, shall be borne by the insurer, certified medical plan, or the health service plan. Payments to providers for the costs of the independent clinical review shall be made promptly. For Medi-Cal eligible patients placed in these private facilities, the costs of the clinical review required by Sections 6002.10 to 6002.40, inclusive, including the costs of the patients rights advocate, shall be borne by the county.