Persons who qualify for Medicaid and receive care from a qualifying community health center will be charged for services based on a sliding fee schedule. In awarding contracts, the department of health services may give preference to qualifying community health centers that have a sliding fee schedule. Monies shall be used for the number of patients that exceeds the number of uninsured sliding fee schedule patients that the qualifying community health center served during fiscal year 1994. Each qualifying community health center shall make its sliding fee schedule available to the public on request. The contract shall require the qualifying community health center to apply a sliding fee schedule to all of its uninsured patients.