Mississippi’s Pharmacy Benefit Prompt Pay Act enforces an acquisition-cost floor through its appeals mechanism, much like Arkansas. A pharmacy may challenge a MAC reimbursement as being below its pharmacy acquisition cost — the wholesaler invoice price — and when the appeal is upheld the PBM must raise the payment to at least that acquisition cost. Separately, a PBM may not pay a pharmacy less than it pays its own affiliate for the same service.
The statute requires a reasonable appeals procedure with dedicated contact methods, allows up to about 30 business days to file, requires the PBM to respond within 30 business days, and requires MAC lists to be updated within 3 calendar days. It does not set a fixed NADAC-plus-dispensing-fee schedule.