Mediation communications and documents are privileged and confidential and may not be disclosed in any judicial or administrative proceeding except when:
(1) the parties to the mediation agree, in writing, to disclosure;
(2) a written agreement by the parties to mediate permits disclosure;
(3) a communication or document provides evidence of an ongoing or future criminal activity;
(4) disclosure is necessary to prevent an action or event that is reasonably likely to result in death, serious bodily harm, or substantial injury to the financial interests or property of another;
(5) a communication or document is necessary to defend against a legal malpractice claim by the defendant against the defendant's attorney; or
(6) a communication or document is relevant to determining the existence of an agreement that resulted from the mediation or to the enforcement of an agreement.