ICD-10 Code G83.1 – Monoplegia of lower limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G83.1 – Monoplegia of lower limb
What it is
G83.1 identifies monoplegia affecting one lower limb. Use it when documentation shows paralysis or near-complete loss of voluntary movement limited to a single leg.
Clinical signs
Findings may include marked weakness, absent or minimal active movement, and impaired gait in one leg. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents monoplegia, paralysis, or severe motor loss confined to one lower extremity. It may also fit residual deficits after stroke, trauma, or another neurologic event if the record supports a single-leg deficit. Check documentation for the cause and laterality details.
Do not use for
Do not use it for generalized weakness, paraplegia, or hemiplegia involving more than one limb. Do not assume monoplegia without clear provider documentation.
Coding tip
Query for laterality and underlying cause when the note only says “leg weakness.”