@paxmundi I also have the G Plan. I have heard good things about Mutual of Omaha. Hope you have a good selection of insurance carriers to choose from in California. So glad you are looking at the Supplement/Medigap for yourself.
Barbara

@paxmundi
Hello - hope all issues related to coverage have been resolved. I just read this and other threads mentioning Dr. Zha, Agree unreservedly that she is very good and very empathetic and glad I switched my care to her recently. I actually met her at an NTM conference in Dallas in 2019 and chatted quite a bit with her. I was not seeing her then but was very interested to hear from her that she was starting a BE/NTM group at UCSF. I mentioned that when I saw her a few weeks ago and was pleasantly surprised that she remembered meeting me at the conference .
Back to Medigap plans and your initial question about whether it could cover your visits with her. I wanted to point out that most Medigap plans should kick in if the practice accepts Medicare and claims are not denied. Medigap is designed to cover copays (not deductibles and not all of it for some plans) from traditional Medicare Parts A & B. Having said that, the best plan is definitely Plan G. It does seem you were going in that direction. Sorry to hear that you had a hard time confirming which plans UCSF accepts. My decades long experience with UCSF has been that they run everything through to make sure it is covered and will inform you if it isn't and what the out of pocket might be. In some cases, they absorb it.
I assume you have in the Bay Area? I live in the East Bay.
Hope this is helpful
Mary