Billing Medicare for services requires the correct POS code on the claim form. Improper use of the POS code has been a problem, especially when services are provided in out-patient hospitals and surgery centers. The OIG has found many circumstances where such services were provided in those facilities were billed as though services were provided in the physician office. The POS code is intended to identify where the physician is physically present and has a face to face encounter with a Medicare patient when covered services are provided.
CMS has issues revised and clarified POS coding instructions. They give multiple examples, including one where a Medicare patient receives MRI services at a hospital. The hospital bills the technical component . The physician is to submit a claim showing the professional component POS as his/her office (code 22), since that is where the physician performed the covered service, not the MRI center at the hospital. The Instructions describe the proper use of POS modifiers and are invaluable in avoiding liability to Medicare.