Located in Yumura, Kofu City, Yamanashi Prefecture, Medical Corporation Naitokai Junsei Clinic provides comprehensive medical services with a focus on internal medicine. In addition to general internal medicine, the clinic has a rehabilitation department, supporting everything from routine health management to recovery care for local residents. Specialized outpatient services include sleep apnea syndrome, fever outpatient care, hyperhidrosis treatment, and smoking cessation. The sleep apnea clinic is offered on Saturdays, making it convenient for patients who prefer weekend appointments. However, as Saturdays tend to be busy, the clinic recommends weekday visits for those who can come during the week. The clinic also provides health screenings and various vaccinations, supporting preventive healthcare in the community. Additionally, the clinic offers 'Ferguard M,' a medical supplement certified by the Japanese Society for Dementia Prevention, addressing concerns about dementia prevention. The facility has a parking lot and is barrier-free, ensuring easy access for patients arriving by car or those requiring physical assistance. Clinic hours include weekday mornings and afternoons, with Wednesday and Saturday offering morning-only sessions.