ICD-10 Code G57 – Mononeuropathies of lower limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G57 – Mononeuropathies of lower limb
What it is
G57 identifies disorders affecting a single peripheral nerve or nerve group in the lower limb. Use it when documentation states a mononeuropathy of the leg or foot, without a more specific nerve named.
Clinical signs
Clinical features vary; refer to documentation. Common findings include localized numbness, tingling, pain, weakness, or sensory loss in a nerve distribution of the lower extremity.
When to use this code
Use G57 when the provider documents mononeuropathy of the lower limb and no more specific ICD-10 code is available. It also fits cases described as lower-limb peripheral mononeuropathy, but check documentation for the exact nerve involved.
If the record names a specific condition such as entrapment or a named nerve lesion, code to that more specific diagnosis when supported. If the chart is nonspecific, G57 is the appropriate category code.
Do not use for
Do not use G57 for polyneuropathy, radiculopathy, or generalized neuropathies. Also avoid it when documentation identifies a different site or a more specific nerve disorder.
Coding tip
Review the note for the exact nerve and laterality; if the provider is nonspecific, G57 may be the best available code.