The community mental health center I go to is big on colaboration. You have the case manager that writes the treatment plan and is the client's main point of contact. Then their individual therapist, therapists that run groups, psychiatrist, and primary care doctor. All of these resources could potentially be accessed right in one place. I have therapy, groups, and starting next week, will have my primary health care at this place. When I did my intake, they encouraged me to sign many releases, both for everyone at the center to communicate with one another, but also for them to communicate with past treatment providers, social security (I'm on SSI), the residential facility I live at, ETC. They did not require it, but said that if I didn't sign the releases then it would be much harder for them to treat me.
I felt comfortable with this, because I know they just want to be as helpful as possible.