As for FSAs, it depends on your employer (employers decide what is eligible). I processed claims for federal employees and it was eligible, but you had to have a letter of medical necessity (LMN) approved. (Well, SRS was eligible...we were never given specifics on which procedures were eligible, but I would assume that top surgery would be considered SRS...you can always have your doctor explain that if you have to have a letter.)
Usually, the third party administrator (the company handling the FSA) is responsible for approving LMNs. It depends on the company, though. I worked for SHPS.
I would suggest calling. You don't have to give personal info for a general question if you don't want to.