ICD-10 Code I69.042 – Monoplegia of lower limb following nontraumatic subarachnoid hemorrhage affecting left dominant side (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I69.042 – Monoplegia of lower limb following nontraumatic subarachnoid hemorrhage affecting left dominant side
What it is
This code identifies a lingering paralysis or severe weakness of one lower limb caused by a prior nontraumatic subarachnoid hemorrhage. It applies when the affected side is the left and the patient is dominant-sided as documented.
Clinical signs
Typical findings include marked weakness or inability to move one leg, with residual neurologic deficits after the hemorrhage. Clinical features vary; refer to documentation for laterality, dominance, and whether the deficit is monoplegia rather than broader hemiplegia.
When to use this code
Use this code for follow-up encounters when the record states monoplegia of the lower limb is due to a past nontraumatic subarachnoid hemorrhage. Confirm that the provider links the deficit to the old hemorrhage and specifies the left dominant side. If the cause, side, or dominance is unclear, check documentation.
Do not use for
Do not use this code for acute subarachnoid hemorrhage, traumatic intracranial bleeding, or weakness without a documented hemorrhagic sequela. Do not assign it if the record describes a different limb deficit or does not confirm the post-hemorrhagic cause.
Coding tip
Verify both the residual deficit and the exact laterality/dominance statement before coding I69.042.