When I had top surgery my plan excluded trans care. The plan I have currently is inclusive and covered my hysto and was open to covering my bottom surgery as well (albeit with a very high out of pocket amount, which is why I'm going overseas). I needed a letter from the doctor that does my hormones detailing my transition history, and two mental health referrals to get bottom surgery covered. For top surgery, I believe it is a doctor letter and one mental health referral.