As far as births, the lifetime cost of the injuries that do happen are built into the price. Maybe not a good system, but it's clear enough where the money goes.
However, I'm always surprised by the cost of health in the US. The most surprising thing is that it looks like most Americans seem to not realize that it is perfectly possible to have high quality medicine and well payed doctors if the insurances don't suck all the money between the healthcare system and the patient. Our system has flaws, sure, but the US system looks like crazy to me.
I underwent LASIK in 2002. At that time, it cost me about 1000 USD here in Czechia. On American web discussions, mostly quoted amounts were USD 5-7000.
And it's almost impossible to avoid these traps. It's basically a gamble every time.
[0] For instance I read that the majority of stock in malpractice insurance companies is held by doctors.
Among many other big factors.
None of the above is to make any sort of political point. I still want universal healthcare. Too many people aren't insured or are under insured and it's far too easy for hospitals and insurance companies to screw you and leave you with no recourse, especially if you're already vulnerable. There was a time when I was undecided on the issue, but it seems like every country that has universal healthcare really likes it even if some of them complain endlessly that their healthcare system is a financial black hole (e.g., my UK friends complaining about NHS always getting more money and yet the quality of care doesn't improve perceptively--although that was a pre-COVID sentiment).
I also know American friends who have flown to India to have lasik and paid full price for a reputable Indian doctor to perform it because all-in it was cheaper than paying for it domestically (it's possible that their insurance didn't cover lasik? I'm not really sure how that worked out).
I live Serbia, to use Trump's words - in a "shithole country" (and I fully admit it is :-( ). I've never had a colonoscopy but I had a gastroscopy two months ago and it was fully covered by our single payer insurance.
At the same time a friend of mine needed to have a gastroscopy and a colonoscopy. He decided to go the private route and also chose a full anesthesia. That costed him 30.000 serbian dinars (~255 euros).
So it seems to me that you could buy a return plane ticket to Serbia, stay here for a few days, do a colonoscopy here and it would still cost less than what you need to pay there.