The good news about health care in Japan is that your insurance is accepted pretty much anywhere. The bad news is that most hospitals keep shorter hours than a Blockbuster Video. Generally speaking, Japanese hospitals are only open from about 9 a.m. to 6 p.m., and are usually not open at all on the weekends. So if you lop off a digit at a family barbecue, you basically have to wrap your stump in a Pikachu towel full of ice, wait for Monday to roll around and hope your severed finger doesn't get freezer burn.
Even then, it's no guarantee you'll get to see a doctor, because outpatients are usually only admitted in the morning. If you don't get to the hospital quickly enough, you'll have to wait another day (oh, and good luck using all that personal time in a country where missing work is considered a form of light treason). Also, first-time patients can't make appointments at most medical facilities, so you pretty much just have to show up and hope somebody dies in a car accident on the way to the hospital and frees up a slot. And make sure to bring cash with you (see above), because while the majority of hospitals have ATMs, you really don't want to play "Will my card work here?" while you're bleeding from the face.
If you do manage to make it into a doctor's office, make sure that you bring someone with you who can speak Japanese, because not many doctors or nurses speak English.
http://www.cracked.com/article_20118_5- ... japan.html
Is there any truth to it?