Hospital outpatient therapeutic services, such as ED or clinic visits, that are paid under the OPPS or to critical access hospitals (CAH) on a cost basis must be furnished "incident to" a physician's service to be covered.
In the Medicare Claims Processing Transmittal 2903, April 2014 Update of the Hospital Outpatient Prospective Payment System (OPPS), CMS discusses the current policy regarding billing for certain devices that are received by facilities at no cost, full credit, or partial credit.