As an American, how does that work in practice? I know I can go to Vietnam and be treated for a small amount (I was in a Vietnamese hospital for a couple of days due to a really bad strep infection and dehydration as I was unable/unwilling to swallow, and in a separate incident, also had a round of rabies shots after being bitten by a dog there). I figured it was cheap because everything is cheap there and no one there could afford it otherwise, not because of government insurance. But if I go to Australia, Canada, UK, or any other country, how do I get access to this cheap healthcare without becoming a citizen or paying taxes? Do I qualify just by nature of being there with a valid visa?