title: Medical necessity: making sense out of nonsense.
authors.affiliation: Institute of Medicine, National Academy of Sciences, Washington, DC 20418, USA.
authors.forename: K
authors.initials: K
authors.lastname: Hein
mesh_terms: D000328:Adult; D014487:Centers for Medicare and Medicaid Services, U.S. / Q000458:organization & administration; D002648:Child; D003657:Decision Making; D005194:Family Practice; D006801:Humans; D007349:Insurance, Health, Reimbursement; D008329:Managed Care Programs / Q000458:organization & administration; D008483:Medical Assistance; D014481:United States