Within the United States healthcare reimbursement system administered by the Centers for Medicare and Medicaid Services, PFS stands for the Physician Fee Schedule. The Medicare Physician Fee Schedule is a comprehensive, federally regulated payment system that dictates how much participating physicians, clinicians, and outpatient providers are reimbursed for thousands of distinct medical services, surgical procedures, and diagnostic tests provided to Medicare beneficiaries, serving as a critical cornerstone of national healthcare policy and medical economics.