Coding: make or break for APCs.
D000043:Abstracting and Indexing; D000556:Ambulatory Surgical Procedures / Q000145:classification* / Q000191:economics; D014487:Centers for Medicare and Medicaid Services, U.S.; D006801:Humans; D007344:Insurance Claim Reporting / Q000145:classification*; D008499:Medical Records / Q000145:classification*; D006278:Medicare; D013531:Surgicenters / Q000191:economics* / Q000706:statistics & numerical data; D014481:United States