HMOs: organizational and financial models.
D003153:Community Health Services; D003237:Connecticut; D003695:Delivery of Health Care; D004219:District of Columbia; D005381:Financing, Organized; D006123:Group Practice; D006279:Health Maintenance Organizations; D007348:Insurance, Health; D008962:Models, Theoretical; D009518:New York; D009934:Organization and Administration