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ARTICLE |

Evidence for Self-selection Among Health Maintenance Organization Enrollees

Marilyn Jackson-Beeck, PhD; John H. Kleinman, MD
JAMA. 1983;250(20):2826-2829. doi:10.1001/jama.1983.03340200060029.
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Inpatient utilization and health care costs of employees and their families were studied for 11 employee groups covered by Blue Cross and Blue Shield in the Minneapolis-St Paul area during the year before optional health maintenance organization (HMO) enrollment. Before enrolling in HMOs, those joining averaged 53% fewer inpatient days (470 days/1,000 v 994 days/1,000) than those retaining fee-for-service (FFS) coverage. Both hospital and professional expenditures were lower among HMO enrollees. Age-specific analysis showed higher inpatient use of continuing FFS subscribers in every category. Self-selection may be an important determinant of differences in use and costs when comparing HMOs with FFS coverage.

(JAMA 1983;250:2826-2829)

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