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When a PBM's maximum allowable cost pays less than the pharmacy paid its wholesaler, state law gives the pharmacy a right to appeal. Most pharmacies file far fewer than they could.
Published 2026-10-15 · AYAANIS Technologies, Philadelphia
For information only. This guide is general background for operators and their teams. It is not legal, regulatory or financial advice, and rules change by state and by payer. Check the current source documents linked at the bottom, and your own contracts, before acting.
A MAC (maximum allowable cost) list is the PBM's ceiling price for a generic. When the pharmacy's acquisition cost is above that ceiling, the claim is "underwater". Every state now regulates PBMs in some form, and MAC appeal provisions are among the most common: a defined appeal channel, a deadline for the PBM to respond, and an outcome that is either a price adjustment or a documented denial that names the wholesaler the PBM relied on[1][2].
The deadlines are short and they vary. Oklahoma allows an appeal within ten business days of the final adjusted payment date and requires a PBM response within ten business days; Mississippi allows thirty business days each way[1]. Other states use calendar days. A pharmacy operating across state lines cannot rely on one state's rule.
The filing window starts at adjudication or final payment. A claim found in a month-end report is often already out of time.
Deadline, business or calendar days, and the PBM's required channel (portal, form, email). Put them in a table and keep it current.
The wholesaler invoice matched to the claim date, showing NDC, quantity, unit price and invoice date. Several fills showing a pattern beat one invoice. Multiple wholesalers, where you have them, beat one.
Attach the invoice. Name the wholesaler. Keep a copy of the submission with its timestamp.
Adjusted: reverse and rebill. Denied: the PBM must disclose the NDC and wholesaler it says is available at MAC. Check whether that drug was actually available to you at that price.
If the cited wholesaler was wrong or the product was not available, complain to the state board of pharmacy or insurance regulator. Keep the record.
Late filing: a correct appeal filed late is rejected on timing alone. Incomplete record: a recoupment record instead of a pricing record. Thin evidence: one favorable invoice rather than a pattern. And the window simply closing before the invoices were gathered[1].
The common thread is that MAC appeals are a daily process that most pharmacies run as a quarterly project. The claims are there every morning. The invoices are already in the system. What is missing is the routine that matches them before the window closes.
RXLens reviews every claim every day, matches each one to the pharmacy's acquisition cost, and lists the underwater claims with the invoice evidence attached and the state deadline counting down. The pharmacist decides which to file; the record is already built. The same daily review covers the other money a pharmacy is owed: manufacturer and Medicare MFP refunds, unreversed scripts to return to stock, and audit exposure.
A free place to start: the RXLens money-leak check estimates what a pharmacy is losing each month in below-cost claims, refunds and unreversed scripts. Three minutes.
It depends on the state and the contract. Examples: ten business days in Oklahoma, thirty business days in Mississippi[1]. Many states fall between those, some in calendar days. Confirm your state's statute and your PBM contract.
A wholesaler invoice matched to the claim date showing NDC, quantity, unit price and invoice date. A pattern across several fills, and more than one wholesaler source where available, makes a stronger appeal.
In most states the PBM must identify the NDC and the wholesaler it says has the drug available at or below MAC. If that source is wrong, or the drug was not available to you at that price, the denial can be challenged with the state regulator[1].
Usually not. Filing windows run from adjudication or final payment and are measured in days, not months. This is why the review has to be daily.
RXLens builds the record (claim, cost, invoice, deadline) and presents it ready to file through the PBM's channel. The pharmacy files and keeps control of what goes to the PBM.
RXLens matches every claim to your cost every morning and lists the appeals with the evidence attached. Start with the free money-leak check.