Objective. The prevalence of four Diabetes Quality Improvement Project (DQIP) measures was explored in Maine diabetics enrolled in the state Medicaid program or the Maine Health Management Coalition (MHMC) Methods. Diabetics were identified in the billing claims database for Medicaid and the MHMC. The four DQIP measures being studied were glycosylated hemoglobin (HbA1c) test, lipid profiles, dilated eye exam, and nephropathy monitoring. These measures were calculated for three separate analyses: (1) using different denominator entry criteria, (2) trends from 1994--1999, and (3) comparing hypertensive with non-hypertensive diabetics. The chi-square test, multiple logistic regression, and the Mantel-Haenszel chi-square test for trend were used for these analyses Results. The DQIP measure rates varied widely among denominators within each cohort and diabetics in the MHMC cohort had significantly higher rates than those in the Medicaid cohort (p < 0.001). All DQIP measure rates had a positive trend over tire (p < 0.05) in both cohorts with the exception of nephropathy monitoring in the Medicaid cohort, which had a negative trend (p < 0.05). These trends were more prominent in the MHMC cohort. Within the Medicaid cohort, 36 percent of the diabetics also had hypertension. These hypertensive diabetics were significantly more likely to have had the DQIP measures than non-hypertensive diabetics (p < 0.001) Conclusions. The DQIP measures reported here confirm the urgency in identifying effective mechanisms for delivering preventive care and ongoing monitoring that are congruent with defined standards of benefit to all diabetics. The rates of these DQIP measures are improving, but remain less than optimal This research was supported by the Maine Diabetes Control Program through a Centers for Disease Control and Prevention/Division of Diabetes Translation grant (Cooperative Agreement U32-CCU100335), the Maine Health Management Coalition, and the Maine Medicaid Program