Causalgia of left upper limb

This code signifies a complex regional pain syndrome (CRPS) type II affecting the left upper extremity, characterized by severe burning pain, allodynia, and hyperalgesia following a nerve injury. It represents a neuropathic pain state with autonomic dysfunction, trophic changes, and motor impairment.

Apply this code when documentation clearly indicates causalgia, or CRPS type II, specifically localized to the patient's left arm, forearm, or hand. Supporting documentation should detail a confirmed nerve injury preceding the onset of the characteristic burning pain and associated symptoms.

• Differentiate carefully between CRPS type I (reflex sympathetic dystrophy) and type II (causalgia), as this code is specific to type II.
• Ensure the laterality (left upper limb) is explicitly documented; do not assume.
• Code any underlying nerve injury or trauma separately, if applicable, as the primary cause.