That is more a function of the size of the US medical system than its overall quality. The average American is going to whatever hospital is closest when they have an emergency, but if you’re healthy and wealthy enough to go anywhere then you can pick and choose extreme outliers. Large countries simply have more extreme outliers in both directions.
More US citizens seek treatment outside the US than foreign nationals seek treatment inside the US. But, people have specific diseases and sometimes the best treatment is inside the US, though more often it isn’t.
I don't think it's true. In fact, I'm pretty sure each year 14 millions Americans are going to Canada for medical treatment, and richer American are going to Singapore/Uk.
