Every graph of healthcare costs vs privatisation with the US in it is necessarily a comparison between private and public healthcare systems since most countries have single payer as most of their healthcare.

The US government healthcare programs are by far the most cost effective offering in the US but it's hampered by regulations such as not having the ability to negotiate prices (until the recent tiny concession on a handful of drugs that has paid off in spades).

Finally, other large countries including India and China may have lower life expectancy, but they're close and rising rapidly compared the stagnant US trends. Of course the bang for the buck they get is at least 5x what the US gets with its ridiculous system