ICD-10 Code G83.3 – Monoplegia, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G83.3 – Monoplegia, unspecified
What it is
G83.3 identifies monoplegia affecting one limb without further specification. Use it when documentation confirms paralysis or severe weakness limited to a single arm or leg, but does not name the cause or affected side.
Clinical signs
Clinical features vary; refer to documentation. Typical findings include marked loss of voluntary movement in one limb, with reduced strength and functional impairment. Sensation may be preserved or altered depending on the underlying neurologic condition.
When to use this code
Use this code when the record clearly states monoplegia and no more specific code is supported. It may apply in encounters documenting isolated limb paralysis after neurologic injury, stroke, or other central nervous system disorder, when laterality and cause are not specified.
If the chart identifies a more specific type, side, or underlying condition, code that detail instead. Check documentation when weakness is described without true paralysis, or when the provider uses a different neurologic diagnosis.
Do not use for
Do not use this code for generalized weakness, hemiplegia, paraplegia, or quadriplegia. Do not assign it when the documentation specifies a cause with a more precise diagnosis.
Coding tip
Query the provider if the note says “weakness” but does not clearly establish monoplegia.