By the numbers. Insurers and managed care.
D054598:Blue Cross Blue Shield Insurance Plans; D003625:Data Collection; D006276:Health Facility Size; D006279:Health Maintenance Organizations / Q000706:statistics & numerical data; D007182:Income / Q000706:statistics & numerical data; D007341:Insurance / Q000331:legislation & jurisprudence; D008329:Managed Care Programs / Q000145:classification / Q000191:economics / Q000706:statistics & numerical data*; D008484:Medicaid / Q000458:organization & administration / Q000706:statistics & numerical data; D013219:State Government; D014481:United States