ICD-10 Code G83.20 – Monoplegia of upper limb affecting unspecified side (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G83.20 – Monoplegia of upper limb affecting unspecified side
What it is
G83.20 identifies paralysis limited to one upper limb when the affected side is not documented. Use it when the record states monoplegia of an arm or upper extremity without laterality.
Clinical signs
Typical findings include marked weakness or complete loss of voluntary movement in one upper limb. Clinical features vary; refer to documentation for laterality, cause, and whether the deficit is flaccid or spastic.
When to use this code
Use this code when the clinician documents monoplegia of the upper limb and does not specify right or left side. It also fits when the note confirms single-limb paralysis but the side remains unclear after review. Check documentation if the record describes hemiplegia, paraplegia, or generalized weakness instead.
Do not use for
Do not use this code for weakness only, transient numbness, or paralysis involving both upper and lower limbs. Do not assign it when laterality is documented and a more specific code is available.
Coding tip
Query the provider for laterality before finalizing the code, because unspecified side codes should be used only when documentation remains incomplete.