Missouri ERCP expert witnesses are gastroenterologists and interventional endoscopists who assess ERCP technique, peri-procedural decision-making, and complication management. Many practice in tertiary referral settings tied to Washington University in St. Louis and the University of Missouri Health Care network, where complex biliary and pancreatic cases are common. They evaluate standard of care, imaging interpretation, informed consent, and outcomes involving pancreatitis, perforation, infection, or retained stones.