This study investigated the effects of a diabetes outpatient intensive management program (DOIMP) on glycosylated hemoglobin (HbA(1)c) levels and adherence to diabetes control recommendations over a 12-week follow-up period for patients with diabetes. The DOIMP was composed of multidisciplinary diabetes education, complication monitoring, and telephone counseling. Twenty-five patients in the intervention group participated in the DOIMP, whereas 24 in the control group were briefed on the conventional description of diabetes mellitus by diabetes education nurses. Patients in the intervention group decreased their mean HbA(1)c levels by 2.3%, as compared with 0.4% in the control group. There was a significant increase in adherence to diet for the intervention group as compared with the control group. These findings indicate that the DOIMP can improve HbA(1)c levels and adherence to diet in patients with type 2 diabetes.