CD Medical Oshima Station Clinic is conveniently located just a one-minute walk from Oshima Station on the Toei Shinjuku Line. Specializing in internal medicine, the clinic places particular emphasis on gastroenterology. Director Dr. Kenji Kondo is a board-certified gastroenterologist who has made the diagnosis and treatment of ulcerative colitis—a designated intractable disease—a key area of focus, and has performed over 30,000 gastrointestinal endoscopic examinations and procedures. The clinic is equipped with a state-of-the-art endoscopy system, offering both oral and transnasal gastroscopy. Sedation is available for both upper and lower endoscopy to ensure a comfortable experience with minimal discomfort. Same-day combined gastric and colonoscopy examinations are also available, which reduces the need for repeated dietary restrictions and hospital visits. Polyps detected during colonoscopy can be removed on the spot as a same-day outpatient procedure. The clinic also functions as a community primary care provider, addressing a wide range of internal medicine symptoms and conditions. consultations are available on weekends, including Saturdays and Sundays, making it accessible for patients who have difficulty visiting on weekdays. The clinic accepts major credit cards, debit cards, and electronic payments, and features barrier-free facilities. General consultations are available for patients aged 15 and above.