The commercial health insurance industry in transition.
D004465:Economic Competition; D005251:Fees, Medical; D006279:Health Maintenance Organizations / Q000191:economics; D006801:Humans; D007193:Independent Practice Associations; D007341:Insurance / Q000191:economics*; D007343:Insurance Carriers / Q000191:economics*; D007348:Insurance, Health / Q000639:trends*; D011243:Preferred Provider Organizations / Q000191:economics; D012051:Reimbursement Mechanisms; D014481:United States