| Sumario: | Part of a special section on dually eligible Medicare and Medicaid beneficiaries. A study was conducted to examine use of the principal inpatient diagnostic cost groups (PIPDCG) and hierarchical coexisting conditions (HCC) risk-adjustment methodologies for a population of dually eligible beneficiaries receiving chronic long-term care. It was argued that measures of individual predictive accuracy for this population compared with the total Medicare population were similar for the PIPDCG models but somewhat smaller for the HCC models. In addition, it was contended that incorporating measures of functional status raised the R2 values by only a small amount for Medicare expenditures but by a somewhat larger amount for total expenditures. Finally, it was noted that the addition of other variables further enhanced the predictive power.
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