Health care distribution and third-party payment for nurses' services.
D000574:American Medical Association; D054598:Blue Cross Blue Shield Insurance Plans; D003695:Delivery of Health Care; D004471:Economics, Nursing; D005381:Financing, Organized; D049672:History, 19th Century; D049673:History, 20th Century; D006761:Hospitals; D007348:Insurance, Health / Q000266:history; D007883:Legislation, Medical; D008484:Medicaid; D006278:Medicare; D009732:Nursing Care; D012952:Societies; D014481:United States