ICD-10 Code G57.31 – Lesion of lateral popliteal nerve, right lower limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G57.31 – Lesion of lateral popliteal nerve, right lower limb
What it is
This code identifies injury or dysfunction of the lateral popliteal nerve, also called the common peroneal nerve, in the right lower limb. Use it when documentation specifies the right-sided nerve lesion.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include weakness of foot dorsiflexion or toe extension, sensory changes over the lateral leg or dorsum of the foot, and possible foot drop.
When to use this code
Use G57.31 when the record clearly states a lesion, neuropathy, or nerve injury affecting the right lateral popliteal nerve. It may also apply when the clinician documents common peroneal nerve involvement on the right and no more specific code is provided.
Do not use for
Do not use this code for left-sided, bilateral, or unspecified nerve lesions. If the note describes a different nerve, a generalized peripheral neuropathy, or another cause, check documentation.
Coding tip
Confirm laterality and the exact nerve named in the assessment before assigning G57.31.