Maryland Code, Insurance § 15-1628.3

(a) A pharmacy benefits manager or a carrier may not directly or indirectly charge a contracted pharmacy, or hold a contracted pharmacy responsible for, a fee or performance-based reimbursement related to the adjudication of a claim or an incentive program.

(b) A pharmacy benefits manager or carrier may not make or allow any reduction in payment for pharmacy services by a pharmacy benefits manager or carrier or directly or indirectly reduce a payment for a pharmacy service under a reconciliation process to an effective rate of reimbursement, including generic effective rates, brand effective rates, direct and indirect remuneration fees, or any other reduction or aggregate reduction of payments.