(a) The department shall develop a voluntary drug manufacturer rebate program for drugs purchased by or on behalf of a client of the Kidney Health Care Program or the Children with Special Health Care Needs Services Program for which rebates are not available under the Medicaid drug manufacturer rebate program.
(b) The department shall consult with drug manufacturers to develop rebate amounts for the new voluntary rebate program. The average percentage savings from rebates in the new program may not be less than the average percentage savings from rebates in the Medicaid drug manufacturer rebate program.

(c) Amounts received by the department under the drug rebate program established under this section may be appropriated only for the Kidney Health Care Program or the Children with Special Health Care Needs Services Program.