You can, you would just need to get a referral for top surgery. Like Alex said, I would start by figuring out if your insurance will pay for it, and if so, what they require in order to deem it medically necessary. Then I would find out what surgeons are in network so that you can get in touch with them and see what they require. Most just want a single referral from a therapist, but mine would've taken a note from the doctor that does my HRT.