Yokoyama ENT Clinic, located in Komagane City, Nagano Prefecture, is a specialized medical facility for otolaryngology and allergy that opened in November 1999. The clinic primarily offers otolaryngology and allergy services, providing comprehensive ENT care along with sublingual immunotherapy for Japanese cedar pollen allergy and mite-induced allergic rhinitis. Consultation hours are 8:30 AM to 12:00 PM and 3:00 PM to 6:00 PM, with reception opening at 8:15 AM and 2:45 PM respectively. The clinic is closed on Wednesday afternoons, Saturday afternoons, Sundays, holidays, year-end/New Year period, and during the Obon season. Infection prevention measures include temperature checks and medical questionnaires upon arrival, with arrangements allowing patients who arrive by car to wait in their vehicles. The clinic accepts both appointments and walk-in patients. English language services, parking, and barrier-free accessibility are available. The director holds a Doctor of Medicine degree and is a board-certified specialist in Otolaryngology and Bronchoesophagology.