In terms of technological advances, or maximizing wellness of the maximum people?
People of wealth travel from all over the world for access to the cutting edge techniques and treatments found in US institutions like mayo clinic and John Hopkins.
The problem is the cost and access is very uneven.
The advances they come from this system spread across the world. Obviously it isn't the only way advances are made, and it doesn't justify the exploitation, but the world certainly benefits from American healthcare research.
(Again not implying important advances only come from America)
Except the money Americans are taxed gets invested in "Healthcare" only for them to receive no benefit from it. We actually get taxed more than some socialist/less capitalist countries.