ICD-10 Code G57.92 – Unspecified mononeuropathy of left lower limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G57.92 – Unspecified mononeuropathy of left lower limb
What it is
This code identifies a single-nerve disorder affecting the left lower limb when the exact nerve and cause are not documented. Use it when the chart confirms mononeuropathy, but details remain unspecified.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include localized numbness, tingling, pain, or weakness in the left leg or foot, consistent with involvement of one peripheral nerve.
When to use this code
Use G57.92 when the provider documents mononeuropathy of the left lower limb without naming the affected nerve. It also fits when laterality is clear, but the record does not support a more specific code. If the cause or exact nerve is identified, check documentation for a more precise code.
Do not use for
Do not use this code for generalized polyneuropathy, radiculopathy, or mononeuropathy affecting another limb. Avoid it when the documentation specifies a different nerve or a more specific left lower limb neuropathy code.
Coding tip
Before assigning G57.92, confirm that the note supports left-sided involvement and that no more specific nerve diagnosis is documented.