How Medicare HMOs manipulate the market.
D003625:Data Collection; D018588:Fee-for-Service Plans / Q000191:economics* / Q000706:statistics & numerical data; D005102:Health Expenditures / Q000639:trends; D006279:Health Maintenance Organizations / Q000191:economics* / Q000706:statistics & numerical data; D006278:Medicare / Q000706:statistics & numerical data*; D014481:United States