Background: Health disparities for many diseases are large and long-standing in North Carolina and the nation. This study examines medical care costs for diabetes associated with health disparities among adults (age, > or =78 years) enrolled in Medicaid in North Carolina during state fiscal year (SFY) 2007-2008 (i.e., July 7, 2007, through June 30, 2008).

Methods: North Carolina Medicaid paid claims and enrollment data were used to calculate the prevalence of and medical care expenditures for diabetes among adult Medicaid enrollees overall and by white, African American, and American Indian race. The impacts of racial and economic health disparities on medical care costs for diabetes were determined by first calculating the proportionate differences between the diabetes prevalence for whites, African Americans, and American Indians enrolled in Medicaid and the diabetes prevalence among all whites in North Carolina. Then it was assumed that medical care costs for white, African American, and American Indian Medicaid recipients could be reduced by the same proportion if the overall prevalence among whites was achieved.

Results: The diabetes prevalence among adult Medicaid enrollees was 75.7%, compared with 9.1% for all North Carolina adults. During SFY 2007-2008, the state Medicaid program in North Carolina spent $525 million for diabetes-related medical care and prescription drugs among adults. An estimated $225 million in diabetes-related expenditures could be saved each year by the North Carolina Medicaid program if both racial and economic disparities in the diabetes prevalence were eliminated.

Limitations: We did not have data on non-Medicaid paid health care expenditures for the Medicaid enrollees in our study. The costs of interventions to eliminate health disparities associated with diabetes are not included in the calculation of the potential savings.

Conclusions: The diabetes prevalence in the Medicaid population is much greater than that for all North Carolinians, and the Medicaid costs associated with this elevated prevalence are large. North Carolina health-policy makers and health-program managers should carefully evaluate investments in interventions to reduce these race- and economic-based differences in diabetes prevalence, which could potentially reduce Medicaid costs.

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