Causalgia of right lower limb

This code signifies a complex regional pain syndrome (CRPS) type II, specifically characterized by burning pain, allodynia, and hyperalgesia in the right lower extremity, following a documented nerve injury. It represents a chronic neuropathic pain condition that can involve autonomic and trophic changes.

This code is appropriate for patients presenting with persistent, severe burning pain in the right lower limb after a known peripheral nerve injury, such as a crush injury, laceration, or surgical trauma. Documentation should clearly specify the nerve injury and the characteristic symptoms of CRPS type II localized to the right lower extremity.

• Ensure documentation explicitly states "causalgia" or "CRPS type II" and specifies the right lower limb.
• Distinguish from CRPS type I (reflex sympathetic dystrophy), which lacks a documented nerve injury.
• Code any underlying nerve injury or trauma separately, if applicable, as an external cause code.