This study presents a case of add-on traditional Korean medical treatments in a 77-year-old male patient with uncontrolled type 2 diabetes mellitus with conventional oral hypoglycemic agents. Chief complaints were uncontrolled glucose level and weight loss. The patient was treated with electroacupuncture (on ST36, CV4, and CV12), herbal medication, and lifestyle advice. The conventional oral hypoglycemic medications were maintained. After 12 weeks, the glycated hemoglobin A1c (HbA1c) decreased from 11.0% to 8.4%. There were significant abnormalities in the liver function and renal function tests, but no adverse event was reported. Further studies are needed to confirm the findings of this case.