(a) A health maintenance organization shall pay per capita maintenance taxes under this chapter on the correctly reported gross revenues collected from issuing health maintenance certificates or contracts in this state.
(b) The amount of maintenance tax assessed may not be computed based on:
(1) enrollees who as individual certificate holders or their dependents are covered by a master group policy paid for by revenues received from the United States for insurance contracted for by the United States in accordance with or in furtherance of Title XVIII of the Social Security Act (42 U.S.C. § 1395c et seq.) and its subsequent amendments; or
(2) revenues paid on group health, accident, and life certificates or contracts in which the group covered by the certificate or contract consists of a single nonprofit trust established to provide coverage primarily for employees of:
(A) a municipality, county, or hospital district in this state; or
(B) a county or municipal hospital, without regard to whether the employees are employees of the county or municipality or of an entity operating the hospital on behalf of the county or municipality.