A track record. When it comes to assuring quality and protecting consumers, HMOs have an established track record.
Carneal
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Group Health Association of America, Washington, DC, USA.
D000068:Accreditation; D014487:Centers for Medicare and Medicaid Services, U.S.; D006279:Health Maintenance Organizations / Q000331:legislation & jurisprudence / Q000592:standards*; D008484:Medicaid; D006278:Medicare; D011785:Quality Assurance, Health Care / Q000331:legislation & jurisprudence / Q000458:organization & administration*; D014481:United States