A doctor I know wrote this response on a public consumer forum when someone posited essentially the same idea.
Don't confuse the ER with real medical care.
Think the ER can treat a ureteral stone? All it can do is give you some pain pills. A urologist has no obligation to remove your stone unless you can pay for his/her services.
Look at this article from the UK:
"The operation costs £2,500 privately, £1,200 or less on the NHS if done as day surgery."
Private surgery? Now why would you pay twice as much for private surgery when the UK offers universal healthcare?
All depends on how long you want to wait.
I had a broken hand, went into the ER when I was young and without coverage, the doc gave me a sling and some meds. I had to pay $1,200 out of pocket for everything.
ER doesn't cover ****