Causalgia of bilateral lower limbs

This code signifies a chronic, severe burning pain, often accompanied by trophic changes and autonomic dysfunction, affecting both lower extremities. It represents a form of complex regional pain syndrome (CRPS) type II, specifically involving nerve injury.

Apply this code when documentation clearly indicates causalgia (CRPS type II) affecting both lower limbs, stemming from a confirmed nerve injury. Supporting documentation should detail the burning pain, allodynia, hyperalgesia, and any associated vasomotor or sudomotor abnormalities in both legs.

• Ensure documentation explicitly states "bilateral lower limbs" and "causalgia" or "CRPS type II" with a confirmed nerve injury.
• Do not confuse with CRPS type I (reflex sympathetic dystrophy) which does not involve a confirmed nerve injury.
• Code any underlying nerve injury or associated conditions separately, if documented.