Sec. 4. (a) The department, with the approval of the budget agency, shall establish, implement, and maintain an aggregate prescription drug purchasing program through which terms are negotiated related to the purchase of prescription drugs by:
(1) an entity described in section 5(a) or 5(b) of this chapter; or
(2) an individual who is covered under a health benefit plan that includes a prescription drug benefit.
(b) The budget agency may contract with a pharmacy benefit manager or other person to conduct the negotiations of the program established under subsection (a).
(c) The terms and conditions of the program are subject to the approval of the budget agency.