Missouri pain medicine expert witnesses evaluate complex acute and chronic pain care across hospitals and outpatient clinics. Many are board-certified anesthesiologists or physiatrists with subspecialty training in interventional pain, neuromodulation, and opioid stewardship. They often practice within major systems like BJC HealthCare and academic centers in St. Louis and Columbia. These experts assess standard of care, causation, medication management, and procedure-related complications.