Md. Code Ann., Cts. & Jud. Proc. § 5-615

In the absence of an affirmative showing of malice or bad faith, each arbitrator or individual conducting alternative dispute resolution in a health care malpractice claim or action under Title 3, Subtitle 2A of this article from the time of acceptance of appointment has immunity from suit for any act or decision made during tenure and within the scope of designated authority.