| Sumario: | Part of a special section on dually eligible Medicare and Medicaid beneficiaries. The writers employ a two-part model of demand to model the effect of qualified Medicare beneficiary (QMB) enrollment on medical care use. Assuming QMB enrollment to be exogenous, they report that Part B utilization is 12 percent higher and Part B expenditures 44 percent greater among QMBs than among eligible non-enrollees. In addition, they argue that there is no difference between these two groups in overall Part A expenditures. Furthermore, they point out that, modeling the possibility that QMB enrollment is endogenous, they find qualitatively similar findings, although they note that the estimates are not precisely estimated.
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