ICD-10 Code G57.42 – Lesion of medial popliteal nerve, left lower limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G57.42 – Lesion of medial popliteal nerve, left lower limb
What it is
This code identifies a disorder of the medial popliteal nerve on the left side of the lower limb. Use it when documentation states a lesion, injury, or neuropathic problem affecting that specific nerve.
Clinical signs
Clinical features vary; refer to documentation. Commonly reported findings may include sensory changes, pain, weakness, or abnormal nerve function in the left lower limb.
When to use this code
Use G57.42 when the provider documents a lesion of the medial popliteal nerve on the left lower limb, including confirmed neuropathy or nerve damage at that site. It fits records that clearly identify laterality and the specific nerve involved. If the note only says leg pain or neuropathy without nerve detail, check documentation.
Do not use for
Do not use this code for nonspecific lower-limb pain, generalized peripheral neuropathy, or right-sided or unspecified nerve lesions. Check documentation if the nerve site or laterality is not clearly stated.
Coding tip
Always verify the exact nerve and side in the provider note before assigning G57.42.