BCBS HMOBlue of MA

Hi, I posted this on the main forum earlier today but then discovered this forum and thought I'd post here. I have BCBS HMOBlue of MA and was told they don't cover the Sleeve as a stand alone procedure as they deem it experimental. I have already been approved for RNY which they do cover (they cover DS too but my surgeon doesn't do it). Anyone know how to appeal to them to have it covered? My surgery date was supposed to be 8/23 but has been pushed out to 9/13 which just gives me more time to get nervous and double, triple and quadruple question myself. Any info would be appreciated.

Thanks.

Meg