Every contract between an HMO and a participating provider shall be in writing and shall contain the following hold harmless provision: The provider agrees that in no event shall the provider have a right to seek any type of payment from, bill or charge the member other than the HMO for services provided pursuant to this contract except for the payment of applicable co-payment, co-insurance or deductibles for services covered by the HMO. See definition section Mass. Gen. Laws ch. 176G, § 1.