The quality of ambulatory care in Medicare health maintenance organizations.
S M Retchin and
B Brown
Department of Internal Medicine, Medical College of Virginia, Virginia Commonwealth University, Richmond 23298.
The quality of ambulatory care received by Medicare recipientswho enrolled in health maintenance organizations (HMOs) wascompared to the care received by fee-for-service (FFS) Medicarerecipients, in a quasi-experimental, non-randomized design.Both samples were drawn from the four major geographic areasin the country, and included two types of HMO practices: staff/groupmodels, and independent practice associations (IPAs). A panelof expert physicians developed criteria for evaluating ambulatorycare, and medical record abstractions using these criteria wereperformed on 1,590 outpatient records: 777 FFS and 813 HMO (441staff/group, 372 IPA). While individual items of medical historiesand physical examinations were performed most often for staff/groupHMO patients and least often in FFS patients, odds ratios (OR)for performance in staff/group HMO patients were particularlylarge for health maintenance items: tonometry (OR = 8.4), mammography(OR = 2.7), pelvic examination (OR = 5.3), rectal examination(OR = 2.9), fecal occult blood test (OR = 3.3). The resultssuggest that recommended elements of routine and preventivecare are more likely to be performed for Medicare enrolleesin staff/group HMOs than in FFS settings.
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