If you are a foreigner living in Japan, you should definitely know about this social security system. This means that in Japan, the maximum amount of medical expenses per month is about 100,000 yen. If you have a significant injury or illness and pay more than 100,000 yen at the hospital counter, the portion over 100,000 yen will be returned from the health insurance at a later date. Of course, it is assumed that you are paying monthly medical insurance premiums in Japan. There are surprisingly few sites that explain this in English. Here’s what I found.