HIPAA is about very formal, defined psychotherapy notes, not talking.
http://www.judyroberts.net/Psychotherapy_Notes.htm
A release if a form to release these notes to another.
http://www.hmsa.com/customerservice/...rapynotes.aspx
Not all therapists even keep notes. Therapists usually ask if they can call and talk on the phone to someone else, one's PDoc, etc. out of courtesy and to help coordinate treatment. But if they're formally "working" together and sharing your therapy notes or meds you're taking (that's covered under medical records so completely under HIPAA) that requires a release.
I don't understand why anyone would even be seeing doctors or therapists they don't trust though?