OP has 2 issues here; first, illegal getting health care though ER. Second, it is in the best interest of hospitals/doctors to rack up more fees though legitimate patience to cove expenses of caring illegal, ER care can be expensive, but real treatment can cost even more. I hope I'm getting everything straight here.
How about a nice little drive to Canada - little chilly this time of year. Fall down in a mall - voila - "Oh, by the way doctor, while you are looking at that twisted ankle, would you mind having a look at..."