ICD-10 Code G57.80 – Other specified mononeuropathies of unspecified lower limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G57.80 – Other specified mononeuropathies of unspecified lower limb
What it is
This code identifies a single-nerve disorder in the lower limb that does not fit a more specific mononeuropathy category. Use it when documentation names an “other specified” lower-extremity mononeuropathy but does not identify a different, exact code.
Clinical signs
Clinical features vary; refer to documentation. Common findings in mononeuropathy include localized numbness, tingling, pain, weakness, or sensory loss in a distribution matching one peripheral nerve.
When to use this code
Use G57.80 when the provider documents a specified mononeuropathy of the lower limb and no more precise nerve or site code is available. It also applies when the record supports a lower-limb mononeuropathy but the exact nerve remains unspecified. Check documentation if laterality or a more specific diagnosis is present.
Do not use for
Do not use this code for generalized peripheral neuropathy, radiculopathy, or entrapment neuropathies with a more specific ICD-10-CM option. If the chart names a different lower-limb nerve disorder, code that diagnosis instead.
Coding tip
Match the code to the exact nerve description in the note and choose a more specific mononeuropathy code whenever documentation supports it.