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Purpose – To examine potential sex differences among American Indian and Alaska Native peoples (AIANs) in diabetes prevalence, comorbidities, healthcare utilization, and treatment costs within the Indian Health Services (IHS).

Methodology/Approach – Data were drawn from the IHS Improving Healthcare Delivery Data Project with 437,608 persons in our analytical sample. We described sex and age differences in diabetes, comorbidities, healthcare utilization, and treatment costs among the adults with diabetes. We evaluated the statistical differences between men and women using confidence intervals calculated at the 95% level, with nonoverlapping confidence intervals indicating statistical significance.

Findings – The prevalence of diabetes among females was somewhat higher than that of males (10.82 vs 9.16%, respectively, p < 0.05). Among adults with diabetes, males had statistically higher prevalence of hypertension, cardiovascular disease, and substance use disorders and fewer mental health disorders compared to females. Although males had overall lower average cost of services than females, males had higher utilization for hospital inpatient services than females, and females used more outpatient services.

Research limitations/implications – We are limited to one fiscal year of data and thus cannot predict the influence of healthcare utilization patterns on the overall health of this population. Although a large sample, the findings are only generalizable to the active users of the participating IHS Service Units.

Originality/Value of Paper – This study fills a major gap in our knowledge of sex differences in diabetes prevalence, comorbidities, healthcare utilization, and treatment costs among AIANs. Differences in the comorbidities that characterized the AIAN adult males and females with diabetes in this sample have important implications for mortality and cost of care. Diabetes management that addresses such gender-specific comorbidities, particularly substance use disorders among men and mental health disorders among women, promises to reduce these comorbidities and related complications.