ICD-10 Code G57.70 – Causalgia of unspecified lower limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G57.70 – Causalgia of unspecified lower limb
What it is
G57.70 identifies causalgia affecting an unspecified lower limb. It is used for persistent, severe burning pain after nerve injury when the exact side is not documented.
Clinical signs
Typical findings include burning or shooting pain, tenderness, 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 documents causalgia in a lower extremity but does not specify right or left. It also fits notes describing nerve-related burning pain in the leg or foot after injury, with no more precise site recorded. Check documentation if the record suggests a different neuropathic pain diagnosis.
Do not use for
Do not use this code for generalized leg pain without a documented causalgia diagnosis. Avoid it when the record specifies a different limb, a different pain syndrome, or laterality that is clearly stated.
Coding tip
Verify laterality first; if the side is documented, choose the more specific code instead of G57.70.