title: HCFA requires use of modifiers for hospital outpatient services.
authors.forename: D
authors.initials: D
authors.lastname: Willard
mesh_terms: D000043:Abstracting and Indexing / Q000592:standards; D014487:Centers for Medicare and Medicaid Services, U.S.; D004496:Education, Continuing; D006801:Humans; D007344:Insurance Claim Reporting / Q000145:classification*; D010044:Outpatient Clinics, Hospital / Q000191:economics*; D013514:Surgical Procedures, Operative / Q000145:classification* / Q000191:economics; D014481:United States