This seems to be contradicted by a study[1] that compared the health outcomes of americans in the top 1% and 5% of counties, against the average residents in other developed countries. The conclusion:
> This study suggests that privileged White US citizens have better health outcomes than average US citizens for 6 health outcomes but often fare worse than the mean measure of health outcomes of 12 other developed countries. These findings imply that even if all US citizens experienced the same health outcomes enjoyed by privileged White US citizens, US health indicators would still lag behind those in many other countries.
https://jamanetwork.com/journals/jamainternalmedicine/fullar...
> US has the best healthcare in the World
I hear this repeated a lot, almost like a marketing tagline, but I haven't seen it.
Mostly I see what looks like highly constrained supply: wealthy people wait a long time, sometimes months, even with very alarming or painful conditions, and then get minimal attention - usually no diagnosis, just a guess and a pill - and then are on their own unless they want to start the process over again. Or they may get referred to someone else, which starts the clock over. The lack of diagnosis is now a joke among people I know; my impression is that the doctors lack the resources (i.e., time) to track down the actual problem; they just try to manage everything.
Is there a basis to the claim?
Supporting anecdata: I happen to know of a well-regarded specialist, past retirement age, who works this niche by seeing patients for cash only, insurance billing.