Nagaoka City Oguni Clinic, located in Narasawa, Oguni Town, Nagaoka City, Niigata Prefecture, is a clinic primarily focusing on internal medicine and orthopedic surgery. The clinic places emphasis on treating lifestyle diseases and chronic conditions, providing support for diabetes and hypertension. They have introduced a new measurement device that allows patients to learn their HbA1c levels, an indicator of blood sugar control, on the same day of their visit, enabling rapid diagnosis. In addition to general internal medicine and orthopedic treatments, the clinic provides rehabilitation by physical therapists, offering support for declining physical function in daily life. The clinic is equipped with a parking lot and is working on barrier-free accessibility, making it considerate in terms of access as well. The clinic also offers English language services. It provides services in preventive medicine, including COVID-19 and influenza vaccinations, specific health checkups, and cancer screenings. In November 2025, the clinic hosted the health event "1st Health Exchange Festival," creating an opportunity for interaction with local residents. The clinic also offers home-based and center-based rehabilitation using long-term care insurance.