Oka Clinic is an internal medicine clinic located in Shihachiishicho, Nikko City, just a 10-minute walk from Tobu Nikko Station. Centered on diabetes care specializing in lifestyle disease management, the clinic provides general outpatient care. With a strong focus on home healthcare, they conduct home visit services on Monday, Tuesday, and Friday afternoons. Starting October 2024, the clinic began online consultations, offering both insured and non-insured care for patients who have difficulty visiting in person. Outpatient hours are from 9:00 AM to 12:00 PM, with consultations available on weekdays and Saturdays. Wednesday and Thursday mornings operate on an appointment-only basis. The clinic is closed on Sundays, holidays, year-end and New Year's, Golden Week, and Obon holidays. The clinic features doctors certified as Dementia Orange Doctors and Specified Intractable Disease Physicians, and provides consultations regarding long-term care insurance. They maintain close medical cooperation with Dokkyo Medical University Nikko Medical Center, NHO Tochigi Medical Center, and NHO Utsunomiya Hospital, enabling timely referrals for hospitalization or detailed examinations when needed. The clinic has on-site parking and offers English language services.