ICD-10 Code G57.81 – Other specified mononeuropathies of right lower limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G57.81 – Other specified mononeuropathies of right lower limb
What it is
This code identifies a single-nerve disorder affecting the right lower limb when the condition is not classified elsewhere. Use it for a documented mononeuropathy with a specific right-sided lower-extremity nerve involvement.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include localized numbness, tingling, pain, or weakness in the right leg or foot along one nerve distribution.
When to use this code
Use this code when the provider documents an other specified mononeuropathy involving the right lower limb and no more specific ICD-10-CM option applies. It is appropriate when the record identifies a focal nerve disorder but does not support a different named neuropathy. Check documentation for laterality and the exact nerve if recorded.
Do not use for
Do not use this code for generalized polyneuropathy, radiculopathy, or left-sided lower-limb nerve disorders. If the documentation names a more specific mononeuropathy, code that condition instead.
Coding tip
Confirm the provider’s wording and laterality; if the note does not clearly support a right lower-limb mononeuropathy, check documentation.