I'm not sure.
Last year my T and Pdoc worked at the same clinic for a few months (until my T moved to another place). They could have talked about me during those months, though my Pdoc only worked at that place for one day a week.
After my T moved to another place, she hasn't contacted my Pdoc and also never told me she wanted to talk to him. I don't think it was necessary, I tell my T about the appoinment and Pdoc only was for the meds.

At the clinic my T works now, there're working several other T's. I know my T talk to my replacement T, to help me transfering. I also had two sessions with both T's together.

I don't know if one of them has also discussed me with other T's. I think they can do that, but then they can't say my name or who it is about.

I don't really mind if my T talks about my case to other colleaguas, but I don't them to know it's about me. I don't want T to tell them my name. But to talk about me (without saying my name) to ask for advice or something, I think that would be good, also for me.

But if you don't want that, then you should say it. T's shouldn't talk about you if you don't want that.