This guide covers medical staff law from application through litigation. It sets out the four statutory standards that produce immunity, explains why a court reviewing a peer review action examines the process rather than the medicine, and works through each standard as an evidentiary problem for both sides. It then covers the reporting rules that dominate practice, including the thirty-day threshold, the surrender-while-under-investigation trap, and how to correct or contain a report. It provides a procedural map of the fair hearing, the bylaws provisions worth negotiating before any dispute exists, and the privilege rules that differ by forum. It addresses credentialing, negligent credentialing, economic credentialing, exclusive contracts, and the employment clause that can bypass the entire structure. It closes with the antitrust and constitutional overlays and a practical program for each side.