ICD-10 Code G57.30 – Lesion of Lateral Popliteal Nerve, Unspecified Lower Limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G57.30 – Lesion of lateral popliteal nerve, unspecified lower limb
What it is
This code identifies an unspecified lesion affecting the lateral popliteal nerve, also called the common peroneal nerve, in a lower limb. Use it when documentation confirms the nerve lesion but does not specify side or a more exact cause.
Clinical signs
Typical findings include weakness of ankle dorsiflexion or foot eversion, with possible sensory loss over the outer lower leg or top of the foot. Clinical features vary; refer to documentation.
When to use this code
Use G57.30 when the record states a lesion, neuropathy, or nerve injury involving the lateral popliteal nerve and the lower limb is not otherwise specified. It also fits when laterality is missing or the note does not support a more specific code.
Code it from provider documentation, not from symptoms alone. If the record identifies a more specific diagnosis, such as traumatic nerve injury or a different mononeuropathy, use the documented condition instead.
Do not use for
Do not use this code for generalized peripheral neuropathy, sciatic nerve disorders, or conditions with a clearly documented traumatic cause. Check documentation if the note names a different nerve or a more specific site.
Coding tip
Look for laterality and cause first; if either is documented, a more specific code may apply.