Notwithstanding any other provision of this chapter, the records of a health plan that is licensed pursuant to the Knox-Keene Health Care Service Plan Act of 1975 (Chapter 2.2 (commencing with Section 1340) of Division 2 of the Health and Safety Code) and that is governed by a county board of supervisors, whether paper records, records maintained in the management information system, or records in any other form, that relate to provider rate or payment determinations, allocation or distribution methodologies for provider payments, formulas or calculations for these payments, and contract negotiations with providers of health care for alternative rates are exempt from disclosure for a period of three years after the contract is fully executed.