Be prepared for more than one bill from the Trauma Hospital. Modern Medical Management loves to have each department bill you separately, so you get one bill from the Hospital, one from the Blood Test lab, one from the Radiation (x-ray, cat-scan, mri, etc.) lab, and one from any surgical procedure performed. And these bills will dribble into your mailbox over a period of months. And some of them should come complete with a voice recording of Gomer Pyle saying "Surprise, surprise, SURPRISE!!!" I've also discovered that talking to the staff on-site about this is less than useless, since it seems that the medical and financial arms are totally divorced from each other, and you only know what the real damage is when the bill arrives in the mail. You can probably tell that I'm a bit weary of dealing with the Medical Establishment at the moment.
Some hospitals (or rather medical groups who control various hospitals and medical services under one umbrella group) are better about billing than others, so here's hoping you were with one of the good ones.