Nakajima Naika Clinic, operated by Medical Corporation Nanzanju-kai, is an internal medicine specialty clinic located in Kokubunji City, Tokyo, a 5-minute walk from Kokubunji Station on the JR and Seibu lines. Since its opening in 1994, the clinic has served as a community primary care physician, providing comprehensive general internal medicine. Its most notable feature is a specialized outpatient department dedicated to diabetes and endocrine-metabolic medicine. Director Dr. Yasushi Nakajima holds certifications as a Diabetes Specialist from the Japan Diabetes Society and an Endocrine-Metabolic Specialist from the Japan Endocrine Society, offering specialized care for diabetes, thyroid disorders (Graves' disease, Hashimoto's disease), and various hormonal abnormalities. The diabetes outpatient clinic goes beyond simply aiming to improve test values, practicing team-based care tailored to each patient's individual lifestyle, with regular diabetes education sessions also held. The clinic places strong emphasis on the prevention and management of lifestyle-related diseases such as hypertension and dyslipidemia, and has established a continuous care management system utilizing electronic medical records and PHR. The clinic accepts credit cards and electronic payments, and is fully equipped with parking and barrier-free facilities, creating an accessible environment for a wide range of patients.