Located in Irumagawa, Sayama City, Saitama Prefecture, Sato Internal Medicine is a clinic specializing in internal medicine, marking its 13th anniversary as of April 2025. Since opening, the clinic has focused on treating diabetes, thyroid disorders, and endocrine diseases, with a track record over the past 13 years of 1,130 patients who underwent testing or treatment for suspected diabetes, 874 for various thyroid disorders, 680 for dyslipidemia, and 570 for hypertension. In addition to internal medicine, the clinic also treats hay fever, with once-daily nasal sprays and eye drops that don't sting. As a Saitama Prefecture-designated medical institution, the clinic offers free rubella antibody and hepatitis virus testing without appointments, and provides appropriate guidance based on test results. The clinic also performs arteriosclerosis testing, allowing simple assessment of arterial sclerosis caused by lifestyle diseases. Four staff members are certified as Saitama Prefecture diabetes counselors, ensuring a system that can respond to patient questions and consultations. English language services are available, and parking is provided with 5 spaces on the right side of the clinic and 4 and 8 spaces across the street. The clinic does not examine patients with infectious symptoms such as fever, diarrhea, sore throat, or cough, and does not accept smartphone insurance cards, so patients must bring conventional insurance cards, eligibility verification certificates, or My Number insurance cards. Closed on Wednesdays, Sundays, holidays, year-end and New Year holidays, and Obon holidays.