ICD-10 Code G83.21 – Monoplegia of upper limb affecting right dominant side (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G83.21 – Monoplegia of upper limb affecting right dominant side
What it is
Use this code for paralysis limited to one upper limb on the right dominant side. It identifies loss of voluntary movement in that arm, not generalized weakness or paralysis affecting multiple limbs.
Clinical signs
Findings usually include marked weakness or complete inability to move the right upper extremity. Clinical features vary; refer to documentation for dominance, laterality, and whether the deficit is complete or partial.
When to use this code
Assign G83.21 when the provider documents monoplegia of the right dominant upper limb. Use it for neurologic deficits described as paralysis, hemiplegic arm involvement limited to one arm, or similar wording when the right side and dominance are clearly stated.
Confirm the chart supports a dominant right upper extremity. If the record only says weakness, paresis, or unspecified limb involvement, check documentation before coding this diagnosis.
Do not use for
Do not use this code for generalized weakness, hemiplegia, paraplegia, or monoplegia of another limb or side. Check documentation if the note does not specify right dominance.
Coding tip
Verify both laterality and dominance in the provider note before assigning G83.21.