The lady from the insurance company called back again yesterday. She still hasn't been able to get any definate answers for me, but she had a few suggestions this time.

She suggested getting a letter from my doctor and having it basically state my medical history and weights for 5 years, and any diets I have tried(but said it didn't have to be dr supervised diets).
My question now is....if she isn't positive thats all i need to do, and i do it, send it in and all......is it going to get denied because i don't have all the required info(if there is more that they do require) ??
If it is denied for that reason, can i still appeal. Hoping obviously it wouldn't be denied, but just really worried when she says she still doesn't have all the info.
So, should i go ahead and have my doctor send a letter? Or would i be better off trying to wait until the insurance company gives me a definate list of requirements so I can be certain to get them all done???