I don't know if things have changed in a decade and maybe my experiences weren't the norm, but I was enrolled in the national healthcare plan during my years and found the Japanese healthcare and hospitals to be horrifically outdated and backwards compared to the U.S. Sure, most things ended up being a tenth of the price stateside and for minor things like ear infections or rashes it was fine, but I went through to particularly traumatic (to me, anyway) incidents which is why I'm more than happy to pay what I do for U.S. doctors visits.
During my first year in-country and after discovering how cheap imported liquor was, I ended up drinking until I gave myself peptic ulcers, which is the type where you feel nauseous and about to puke all day long. I have ulcers in my family and enough doctor relatives to know the standard procedure stateside: barium xray, endoscope to confirm then standard treatment of acid-blockers, antibiotics and medication to kill H. Pylori bacteria. At the friendly Osaka hospital I visited, which looked like a WW2-era bunker, I instead had a doctor touch my stomach, grunt a few times, stick me on a fucking IV for an hour because he said I was dehydrated and then send me home with the Japanese equivalent of Tums and a promise to call back if I start shitting or puking blood. I asked about the barium and xray and he replied that such is only for "very serious" cases. Wonders of socialized medicine. I ended up using homeopathic remedies and it took two years for the ulcers to go away.
My dental experience was even worse. An old filling ended up falling out and creating a minor crack in an incisor, so I booked an appointment at a modern-looking dental clinic in downtown Osaka. When I got there, the decrepit dentist looked like he could've been a war criminal from Manchuria and the equipment he was using was such that I hadn't seen since 1984 at my children's dental clinic. He told me I'd need an inlay, which I was fine with, and then as he began prepping he asked if I needed "the shot," which I realized meant anesthetic. No idea how it is in your countries, but stateside it's been standard practice since, say, the 1940s, to give every patient the needle before drilling his/her teeth. So in disbelief, I asked him why he would even ask that, and how in America it's standard practice. His answer, in English, and I'm not even kidding: "ONLY WHITE PEOPLE NEED THE SHOT, BECAUSE THEY ARE WEAK. YOU HAVE JAPANESE BLOOD. YOU SHOULD NOT BE WEAK."
If he was trying to bait me, it worked. "FUCK IT THEN, I DON'T NEED THE FUCKING SHOT." I then spent the next 45 minutes in the worst pain and agony of my life, screaming and howling with tears running down my cheeks and I swear I may have disfigured the metal armrests on the dental chair. I think my nuts inverted and I didn't get a hard-on for a week. When he was finally done, the asshole had the nerve to pat me on the shoulder and exclaim: "YES, YOU ARE REAL JAPANESE!!"
To this day, I don't know if this was standard operating procedure of a sadistic prank, and neither does my dentist here stateside--who also loves to remark that the steel inlay the old man used is ancient technology he hasn't seen used since the 1970s. I'm just too cheap to pay two grand for a proper ceramic crown so if I smile too wide, my silver inlay sparkles like a Puerto Rican pimp's grill.
So you'll just have to forgive me if I don't trust the Japanese health system and I'll be having all of my medical procedures done here stateside for the rest of my life.