If you get sick or injured in Japan, their service will definitely help you a lot more than anyone in the country. The AMDA International Medical Information Center is providing non-Japanese-speaking people medical information in Japan and amazingly, they also are offering telephone interpretation service free of charge, which will make a communication with Japanese doctors easy. They even explain the health care system in Japan.
Not only in English, but also multiple languages available. Check the details of their service before you get sick.