Development of health insurance.
D054598:Blue Cross Blue Shield Insurance Plans; D002681:China; D003669:Deductibles and Coinsurance; D003695:Delivery of Health Care; D005060:Europe; D005249:Fees and Charges; D005381:Financing, Organized; D006279:Health Maintenance Organizations; D006296:Health Services / Q000706:statistics & numerical data; D049670:History, 17th Century; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D049690:History, Ancient; D006801:Humans; D007348:Insurance, Health / Q000266:history; D007350:Insurance, Hospitalization; D007357:Insurance, Physician Services; D006278:Medicare; D009313:National Health Programs; D014481:United States