Sec. 9. Except in cases of required disclosure to the professional health care provider under investigation, no records or determinations of or communications to a peer review committee shall be:
(1) subject to subpoena or discovery; or
(2) admissible in evidence;
in any judicial or administrative proceeding, including a proceeding under IC 34-18-11 (or IC 27-12-11 before its repeal), without a prior waiver executed by the committee.