This subchapter does not apply to maximum allowable costs for pharmacy benefits provided under:
(1) a Medicaid managed care program operated under Chapter 540 or 540A, Government Code, as applicable;
(2) a Medicaid program operated under Chapter 32, Human Resources Code;
(3) the child health plan program under Chapter 62, Health and Safety Code;
(4) the health benefits plan for children under Chapter 63, Health and Safety Code;
(5) a health benefit plan issued under Chapter 1551, 1575, 1579, or 1601; or
(6) a workers' compensation insurance policy or other form of providing medical benefits under Title 5, Labor Code.