Category M clawback: margin that leaks after the dispensing is done
Category M is the mechanism by which NHSBSA retrospectively adjusts Drug Tariff reimbursement prices to reflect actual drug costs to dispensing contractors. The adjustment happens in later periods, not at the time of dispensing. If your monthly accounts do not reconcile the Tariff adjustment to your ledger, the margin leakage is invisible until year-end, by which point the opportunity to act on it has passed.