trauma 33812 Acute post-thoracot pain 33818 Acute postop pain NEC 33819 Acute pain NEC 33821 Chronc pain d/t trauma 33822 Chron post-thoracot pain 33828 Chronic postop pain NEC 33829 Chronic pain NEC 3383 Neoplasm related pain 3384 Chronic pain syndrome 33900 Cluster headache syn NOS 33901 ...