CareFirst BCBS of Maryland, Virginia, DC

I am hoping to have a revision and I was wondering if anyone had success with the approval process with CareFirst BCBS of Maryland. I know they cover initial bariatric surgeries, but I am not sure if they cover revisions. I called CareFirst and the representative did not know what a revision was, and ultimately told me that it had to be medically necessary. I have already started the process with my doctor and am scheduled to have an EGD, but I also want to be prepared just in case I am denied. Thanks in advance.