Utsunomiya Central Clinic: ransomware attack

A February 10 system failure was traced to ransomware, with information on up to about 300,000 patients and staff potentially exposed. Clinical and screening services were restricted. The March 31 update said investigation continued and no misuse had been confirmed. A June 5, 2026 notice from a referring health-insurance association said outpatient and screening services had resumed in a secured environment and affected members had been notified.