I can understand this is a frustrating situation for you. Many school are now requiring consent/waiver forms to be signed in order to participate in sports programs at the school. You could try to ask for a copy of the school's policy on providing insurance coverage to find out more information. You can certainly also try to speak to an attorney regarding your legal options with the outstanding medical bills. You can find more information about a personal injury attorney through the attorney locator service on LawInfo's home page at:
http://www.lawinfo.com/index.cfm. Some do offer free consultations. Good luck.