I worked on the East coast for six months, my employer provided my insurance (which is usual) and I had to pay copays for any treatment.
I needed insulin but unlike the UK a prescription wasn’t issued for a four week period so I was able to buy insulin for around $70 (this is relying on my memory) that would last my entire trip.
I broke a bone, that was an odd experience. We had to call an ambulance (skin had broken) but the paramedics had to see my insurance documents so they could decide what hospital to take me to, until they had seen them they wouldn’t provide any medical care. That was just so bizarre to me.
At the hospital care was poor, I was left waiting around on the trolley for so long that my blood sugars fell hugely and I was close to a diabetic coma, also you know had a limb with a compromised blood supply! Before any treatment my wrist band and the items were scanned, that even included glasses of water!
You actually end up with an itemised bill, paracetamol was around $20 a tablet, it was around $2,000 for the ambulance.
I was lucky, as mine was a travel policy nothing had to be pre-authorised, the entire bill in the end was around $70,000, they did a crap job and when I got back to the UK I needed treated to fix damage the hospital had caused in the States. Luckily I broke it ten days before I was due home, so it didn’t need to be broken again.