I think why you may not be getting responses, is you are basically asking an insurance question. Most people probably don't have any suggestions of how to deal with the hundreds of insurance companies. (however, give it time, I know there will be some on here who will have some ideas)
However, if the Dr. ordered it, I don't see why BC denied it. Unless it was an ER Dr. Plus, maybe they denied it because it was ordered by your GP? Most likely, they want a referral to an orthopedist first.