Any physician or physician assistant licensed in this State who treats a Medicaid recipient patient suffering from the human immunodeficiency virus, acquired immune deficiency syndrome, or hepatitis C, or who is a patient in need of transplant immunosuppressives, may prescribe any medications approved by the United States Food and Drug Administration and that are eligible for Omnibus Budget Reconciliation Rebates Act (OBRA), that are necessary to treat the condition, without having to comply with the requirements of any preauthorization procedure established by any other provision of this chapter. This section shall not apply to Medicaid managed care medical plans.