That's the point of looking at global healthcare plans, which are giving two prices for the same person depending on whether they will or won't be in the US.

And while they aren't giving the same service, there isn't much evidence the service is necessarily worse. More healthcare doesn't necessarily lead to better outcomes, it's not uncommon for more liberal treatment guidelines to only improve through statistical errors or to lead to compensatory idiopathic illness.

This is systematically incentivized in the US, where both the doctors (obviously) will be paid more for more/worse care, but also the insurers which have to follow the 80/20 or 85/15 rules and are therefore incentivized to increase costs to increase total profits, especially in places where they have little competition, or agreements with hospital systems to pay a similar amount to other insurers.

Additionally, the spurious nature of claims in the US system wastes massive amounts of resources where insurers (with their 15-20% of premiums) but also practitioners (sometimes even over 20%) spend their time just haggling over approvals instead of using a clear and deterministic system, which also causes knock-on consequences later.