ICD-10 Code G57.93 – Unspecified mononeuropathy of bilateral lower limbs (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G57.93 – Unspecified mononeuropathy of bilateral lower limbs
What it is
This code identifies a single peripheral nerve disorder affecting both lower limbs, but the exact nerve and cause are not specified. Use it when documentation confirms mononeuropathy in both legs without a more precise diagnosis.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include localized numbness, tingling, weakness, or pain in nerve-distribution areas of both lower extremities.
When to use this code
Use G57.93 when the provider documents mononeuropathy involving both lower limbs and does not identify a specific nerve, side, or cause. It also fits when the record is clear that the condition is peripheral nerve–based, but details are incomplete.
Choose a more specific code if the documentation names the affected nerve, a unilateral condition, or an underlying cause. If the chart is unclear, check documentation before coding.
Do not use for
Do not use this code for polyneuropathy, radiculopathy, or generalized neuropathic pain. It is also not appropriate when the provider documents a specific mononeuropathy elsewhere in the lower limbs.
Coding tip
Code only what the provider documents; if laterality or nerve involvement is specified, select the more precise mononeuropathy code.