title: Determination of medical necessity for air and critical care medical transportation.
mesh_terms: D003657:Decision Making; D004632:Emergency Medical Services / Q000592:standards* / Q000706:statistics & numerical data; D006801:Humans; D020380:Needs Assessment; D012955:Societies, Medical; D014187:Transportation of Patients / Q000592:standards* / Q000706:statistics & numerical data; D014481:United States; D014600:Utilization Review