title: Looking for changes in retroactive HCFA directives.
authors.forename: D E
authors.initials: DE
authors.lastname: Harrop
mesh_terms: D014487:Centers for Medicare and Medicaid Services, U.S. / Q000458:organization & administration*; D010414:Pennsylvania; D011366:Professional Review Organizations / Q000458:organization & administration*; D012955:Societies, Medical; D014481:United States