When any disability insurer 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 of the Insurance Code, the amount of patient copayment shall be calculated exclusively from the negotiated alternative rate for the service rendered. No disability insurer 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.