You haven't said whether you had the cysts pre-T. I asked because I have heard of insurance companies that acknowledge that you did have those parts, but the company refuses to pay out on the grounds that HRT caused the adverse symptoms. In other words, you brought it on yourself. If you have a documented history of the symptoms pre-T, you should have an easier time. However, insurance laws keep changing. It could be easier to get this covered than it was even five years ago when I heard about the guys who had appealed and won (and I'm not sure when these surgeries and appeals happened, but the situations must have been resolved by 2009).