(a) On and after February 1, 2008, any pharmaceutical manufacturer of a prescription drug covered by the Department of Social Services under a state medical assistance program administered by the department that is a federally qualified state pharmacy assistance program shall provide rebates to the department for prescription drugs paid for by the department under such program in unit rebate amounts equal to the unit rebate amounts paid under the Medicaid program.

(b) On and after February 1, 2008, any pharmaceutical manufacturer of a prescription drug covered by the department under a state medical assistance program that is not a federally qualified state pharmacy assistance program shall provide rebates to the department. The unit rebate amount shall be calculated as follows: (1) For noninnovator multiple source drugs, the average manufacturer’s price multiplied by eleven per cent, and (2) for single source or innovator drugs, the greater of the average manufacturer’s price multiplied by fifteen and one-tenth per cent or the average manufacturer’s price minus best price. In the event the calculated rebate would establish a new Medicaid best price, the unit rebate amount will be capped at the average manufacturer’s price minus best price.

(c) The department may enter into contracts for supplemental rebates for drugs that are on a preferred drug list or formulary established by the department.

(d) Pharmaceutical manufacturers shall submit written confirmation of participation on a form prescribed by the Commissioner of Social Services, that states the terms of participation, including, but not limited to, the process by which a manufacturer may discontinue participation. The department shall provide advance notice to participating manufacturers if a new pharmacy assistance program is established and shall provide the manufacturers with the opportunity to discontinue participation. The department shall promptly notify participating manufacturers if a state pharmacy assistance program becomes disqualified. If a program becomes disqualified and a manufacturer has paid rebates at the rate for a qualified program, the department shall reimburse the manufacturer the amount overpaid as a result of disqualification.

(e) A manufacturer shall not be required to provide a rebate for a prescription drug that is new to the marketplace until the quarter in which the manufacturer has established a Medicaid best price for the product.

(f) No payment shall be made by the department for the prescription drugs of a manufacturer that does not provide rebates to the department pursuant to this section unless a specific drug is determined by the department to be medically necessary for an individual client.