title: AHA tries to block Medicare billing change.
mesh_terms: D000573:American Hospital Association; D014487:Centers for Medicare and Medicaid Services, U.S.; D007349:Insurance, Health, Reimbursement / Q000331:legislation & jurisprudence*; D007351:Insurance, Liability; D006278:Medicare / Q000331:legislation & jurisprudence*; D014481:United States