Ambulatory Payment Classifications (APC) are the United States government's method of paying facilities for outpatient services for the Medicare program. A part of the Federal Balanced Budget Act of 1997 required HCFA (now CMS) to create a new Medicare “Outpatient Prospective Payment System” (OPPS) for hospital outpatient services -analogous to the Medicare prospective payment system for hospital inpatients known as “Diagnosis Related Groups” or DRGs. APCs are an outpatient prospective payment system applicable only to hospitals.
All ATC concepts belong to the “Observation” domain.
All ATC concepts belong to the “APC” concept class