Revision from RNY to DS Blue Cross CA
Diana Hamlet-Cox would know something about this. You could post to her on the DS board or look her up on the people search function and PM her. She's an attorney, a few years postop with the DS, and is very on top of what's currently doable in CA when it comes to bariatric surgery. She's always happy to take a look at someone's insurance stuff and give feedback about how best to go about getting approved or, if you're denied, getting an appeal through.
The state agency that oversees this stuff has set ample precedent of overturning denials for various WLS procedures, and I *think* Diana has said that has included revisions. So what I'm giving you is something like third hand information--just enough to know to send you to someone with some real experience on the subject :-).