The Outpatient Hospital Utilization and Payment Public Use File (Outpatient Hospital PUF) presents information on comprehensive APC (C-APC) services provided to Medicare fee-for-service beneficiaries. The Outpatient Hospital PUF presents information on the number of beneficiaries, number of APC services, hospitals' average total estimated submitted charges, the average Medicare allowed charges (which includes Medicare regular provider payments and beneficiary cost-sharing payments), the average Medicare regular provider payments, the number of APC services with outlier payments, and the average Medicare outlier provider payments among those services for 60 C-APC Groups paid under the Medicare Outpatient Prospective Payment System (OPPS) for calendar year (CY) 2018 by hospital provider. The estimated average charges and the average Medicare payments are provided at the individual hospital level. The actual charges at an individual hospital for an individual service within these APC groups may differ.