California Code, Insurance Code - INS § 10133.3

When any self-insured governmental plan, as defined in Section 12671, negotiates and enters into a contract with professional or institutional providers to provide services at alternative rates of payment of the type described in Sections 10133 and 11512  [FN1] of the Insurance Code, the amount of patient copayment shall be calculated exclusively from the negotiated alternative rate for the service rendered.  No self-insured governmental plan or professional or institutional provider, negotiating and entering into a contract pursuant to this section, shall charge or collect copayment amounts greater than those calculated in accordance with this section.

This section shall become operative on January 1, 1993.