While some services for specific groups and diseases are covered to 100% by the compulsory health insurance other services are covered only in a certain share of the total value of the service. The range of coverage is defined by the Act allowing HIIS to propose exact level of co-payments but within the legal framework. For example the level of co-payments varies from a minimum of 15% to a maximum of 90%, thus determines the minimum or maximum level of co-payments to be paid by the patients.