Washington complex regional pain syndrome expert witnesses assess diagnosis, causation, and treatment of CRPS after trauma or surgery. They often are pain medicine physicians, neurologists, anesthesiologists, physiatrists, or orthopedic surgeons with interventional and rehabilitation expertise. In Washington, many practice within UW Medicine and regional rehab networks serving Seattle and the I-5 corridor. They evaluate nerve injury, diagnostic criteria, functional impairment, and medication, injection, and therapy appropriateness.