I answered 'yes,' because my T and PCP can talk, but I don't know that they ever have. They do read one another's notes on the chart, though. Usually while I'm sitting there. This gives me the advantage of never having to communicate with my doctor beyond monosyllabic affirmations of what my T has already written in the chart:

Dr: "So you've been seeing the counselor fairly regularly?"
Me: "Yes"
Dr: "And that's working for you?--of course it is, otherwise why would you continue to go?"
Me: "Uh-huh"
Dr:"It looks like you've been working on X? And you feel you've made progress? So it's not so much of an issue anymore?"
Me:"No."
Dr:"And it says here you feel the medication is working well for you. So I'll write you another prescription for that..."
Me: "Okay."

Thanks to my T, nothing is expected of me at Dr's appointments beyond monosyllabic grunting and the occasional "thank you, Doctor." This frees the rest of my consciousness to scream "I'm not really here! I'm not really here! I'm not really here!" over and over again until I slip into a comfortable dissociative daze.

My T can then read the Dr's notes and fill me in on whatever I missed while I was too busy think-screaming "I'm not really here!"

So, overall, information sharing between my providers has worked out very well for me. I realize it's not for everybody, though, so I'm sorry if the situation makes you uncomfortable. I hope you're able to talk to your T about it at some point.