N.M. Stat. § 27-2-12.21

A. In accordance with federal law, the secretary shall adopt and promulgate rules that allow a recipient to fill or refill a prescription for less than a thirty-day supply of a prescription drug and apply a prorated daily copayment or coinsurance, if applicable, for the fill or refill, if:

(1) the prescribing practitioner or the pharmacist determines the fill or refill to be in the best interest of the patient;

(2) the recipient requests or agrees to receive less than a thirty-day supply of the prescription drug; and

(3) the reduced fill or refill is made for the purpose of synchronizing the recipient's prescription drug fills.

B. Medical assistance coverage shall not:

(1) deny coverage for the filling of a chronic medication when the fill is made in accordance with a plan to synchronize multiple prescriptions for the recipient pursuant to Subsection A of this section established among the department or the recipient's managed care plan, the prescribing practitioner and a pharmacist. The medical assistance coverage shall allow a pharmacy to override any denial indicating that a prescription is being refilled too soon for the purposes of medication synchronization; and

(2) prorate a dispensing fee to a pharmacy that fills a prescription with less than a thirty-day supply of prescription drug pursuant to Subsection A of this section. The medical assistance coverage shall pay in full a dispensing fee for a partially filled or refilled prescription for each prescription dispensed, regardless of any prorated copayment or coinsurance that the recipient may pay for prescription synchronization services.