Earlier quoted context omitted.
The real problem is how expensive healthcare is in the US. Compare Cignas global plan with and without US coverage. Somehow they can easily cover essentially all of the rest of the world for far less than the US. https://www.cignaglobal.com/
Last I checked, pretty much the entire rest of the OECD was between 40% and 70% of US per-capita spending on healthcare. Some spend less total , per capita, than we do just from public spending that we already do (medicare, medicaid, CHIP, public employee healthcare plans, military care like VA and Tricare, et c.) without even having universal care like ~everyone else does
Per capita numbers can be misleading on healthcare as health is labor intensive, so countries with higher wages will have higher per capita costs with otherwise similar systems.
OTOH, the US spends the second highest share of GDP on healthcare, globally, behind Tuvalu, and about a time and half the GDP share of the second highest large, developed state (Germany). [0]
[0] https://data.worldbank.org/indicator/SH.XPD.CHEX.GD.ZS?most_...