ICD-10 Code G57.7 – Causalgia of lower limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G57.7 – Causalgia of lower limb
What it is
G57.7 identifies causalgia affecting the lower limb, a neuropathic pain syndrome usually linked to injury or irritation of a peripheral nerve. Use it when documentation describes severe burning pain in a leg or foot after nerve damage.
Clinical signs
Typical findings include persistent burning pain, marked sensitivity to touch, and pain that seems out of proportion to the injury. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider specifically documents causalgia of the lower limb or an equivalent diagnosis involving lower-extremity nerve pain. It may appear after trauma, surgery, or other nerve injury. Check documentation for the affected side and any linked nerve if recorded.
Do not use for
Do not use G57.7 for generalized leg pain, sciatica, or pain without documentation of causalgia. If the record describes a different neuropathy or a more specific nerve disorder, code that diagnosis instead.
Coding tip
Code the documented lower-limb site and confirm whether the provider links the pain to a specific nerve injury.