Murtha Cullina has assisted numerous hospitals with issues involving credentialing of physicians, establishing valid rules and procedures to limit access to the medical staff, medical staff privilege disputes, and trade regulation and antitrust questions associated with this subject. The antitrust immunity afforded to participants in professional review activities by the Health Care Quality Improvement Act of 1986 and the availability of information on medical staff applicants and members from the National Practitioner Data Bank have been the subject of increased attention.