I think the key word might be "supplement" in terms of Medicare covering your implant surgery. Since I have a Medicare Advantage plan (HMO) it isn't commonly considered a supplement. It's Part D I have, I believe. So, I see a surgeon for possible implant surgery on May 1st, I'll know more then. But a highly credentialed urologist told me a few days ago that cost for the implant surgery for me would be totally out of pocket, as would the cost for any injection such a Trimix would also be entirely out of pocket. I still believe that because I have below range free testosterone, that is part if not all of my problem. But that urologist dismissed it entirely when I brought it up. I read opposite things about that on-line however.