Maximum Allowable Actual Charge (MAAC)

A limitation on billed charges for Medicare services provided by nonparticipating physicians. For physicians with charges exceeding 115 percent of the prevailing charge for nonparticipating physicians, MAACs limit increases in actual charges to 1 percent a year. For physicians whose charges are less than 115 percent of the prevailing, MAACs limit actual charge increases so they may not exceed 115 percent.