Successful appeal for band to sleeve conversion?

BCBS has denied my request for conversion surgery.  It seems they look at it as two surgeries:  band removal, which they won't approve because I don't have any catastrophic problems with it; and WLS, which they won't approve because my BMI is too low!

I was banded in 2007 and lost 100 pounds.  I was very successful at keeping it all off for about 5 years.  Then slowly over about a 1.5 to 2 year period I gained back about 30.  I have always had bad reflux, sliming, PBing, etc.  You all know the story.  Now my doc tells me that my esophagus is stretched and she emptied my band.  Of course I gained another almost 30 pounds in about 3 months.  She's been telling me for a couple of years that I should convert to the sleeve and I finally agreed.  After jumping thru all the hoops required by the insurance company, they denied me.  

Has anybody successfully appealed a BCBS decision?