My doctors don't interact with each other about any of my health care issues. I am the coordinator. I think because I am a retired health care person, they figure that I can understand and talk to them and share what is happening.
I can't remember if there was ever any communication between doctors in all my life. They now just look at the computerized medical records to see what other doctors have put in the file. Another way the internet has taken the person out of the equation.