HMOs strive to prove savings, battle HCFA payment system.
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D000368:Aged; D014487:Centers for Medicare and Medicaid Services, U.S.; D017046:Cost Savings; D006279:Health Maintenance Organizations / Q000191:economics*; D006801:Humans; D006278:Medicare / Q000639:trends*; D011907:Rate Setting and Review / Q000379:methods; D012051:Reimbursement Mechanisms; D014481:United States