Which countries have that? The most common system I know of is where the government heavily subsidizes medical costs and controls prices to prevent price gouging.

https://en.wikipedia.org/wiki/List_of_countries_with_univers...

I've never come across such a system so I'm very surprised to hear that that is the most common.

Are there any moderately wealthy nations that use this system? Certainly, among OECD nations, that's not used.

Pure propaganda.