What is actually the case is that care available to the bottom quartile of Americans is below the care received on average in a top-tier universal care nation, and the US spends an absolute fortune delivering this quartile with substandard care.
We also spend a bit more than average providing exceptional care to everyone else, except that we also spend a truly ludicrous amount (compared with every place on earth except possibly Japan, which is still less than us but not quite as much less) on care for roughly everybody above the median during the last year of life, because we have baked some very expensive decisions in as the default (basically, if you don't specifically ask otherwise, you will get absolute treatment maximalism basically until 30 days from death)