Koyaba Clinic, located in Koyaba, Kawaguchi City, Saitama Prefecture, is a community-based medical clinic specializing in internal medicine. The clinic relocated and reopened at its current location in July 2025, providing care in a newly renovated facility. Operating hours are from 9:00 AM to 12:00 PM and 3:30 PM to 6:30 PM, with morning sessions available on Monday, Tuesday, Thursday, Friday, and Saturday. The clinic is closed on Wednesday, Sunday, national holidays, and Saturday afternoons, so patients are advised to confirm the schedule before visiting. The clinic offers fever outpatient services, with a system requiring patients with fevers of 37.5°C or higher to contact the clinic before arriving. Influenza vaccinations are also available, including a nasal spray vaccine (FluMist) for children who are uncomfortable with injections, demonstrating thoughtful consideration for patients. English language support is available, making the clinic accessible to those who require non-Japanese communication. A parking lot is available for those arriving by car. As a general internal medicine clinic addressing a wide range of needs from routine health management to infectious disease care, the clinic supports healthcare in the northern Kawaguchi City area.