When our first child was born (a long, traumatic story in itself), after the ordeal was over and we were resting in the hospital, a nice fellow came by and asked whether we wanted to test our baby's hearing. Sure? No mention was made of a price. He put a device in the baby's ears. Hearing was fine. Then we got the bill. Hundreds of dollars, maybe $500, for a moment's effort and no expenditure of resources. We had almost no money at the time and certainly no insurance. This was in Nashville. He was an independent contractor they let wander the halls of the laying in ward accosting unsuspecting new parents. He bought the machine. Now he's got a steady income from this grift.
Another event in Nashville, my wife cut her hand making dinner. We walked to the emergency room. Eventually someone saw us. He asked whether we wanted to try some experimental tree sap glue to close the wound. Sure? It actually wasn't much of a cut and it had stopped bleeding. No mention of a price. While he was squeezing a droplet of liquid out of a tube the attending physician looked over his shoulder. Yep, checks out. It was basically a glance, less than a minute's interaction and no interaction with out. The whole experience, again, when we had essentially no means to pay, cost hundreds of dollars. They guy who glanced over glue man's shoulder tacked on a couple hundred for himself. Coming through the door and signing some papers then waiting hours to be attended to cost us maybe $400.
I've got similar stories from Washington, DC. My son (not the baby with the hearing test) had to deal with the medical system in Vermont. He's dead now but we're still paying the bills. And now we have insurance.
Regular healthcare in the US looks a hell of a lot like a scam. If you have insurance, the scam is less visible, but it's the same system.