ICD-10 Code I69.04 – Monoplegia of lower limb following nontraumatic subarachnoid hemorrhage (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I69.04 – Monoplegia of lower limb following nontraumatic subarachnoid hemorrhage
What it is
This code identifies weakness or paralysis limited to one lower limb as a late effect of a nontraumatic subarachnoid hemorrhage. It applies when the deficit persists after the hemorrhage has occurred and is no longer the acute event.
Clinical signs
Expected findings include unilateral lower-extremity motor loss, reduced strength, and impaired walking or standing on the affected side. Clinical features vary; refer to documentation.
When to use this code
Use I69.04 when the record clearly links monoplegia of a lower limb to a prior nontraumatic subarachnoid hemorrhage. You should code the residual deficit, not the acute hemorrhage, when the encounter is for ongoing neurologic impairment.
Choose this code when the provider documents a persistent post-stroke or post-hemorrhage motor deficit affecting only one leg. Check documentation if laterality, severity, or the causal relationship is unclear.
Do not use for
Do not use this code for acute subarachnoid hemorrhage, traumatic brain injury, or generalized weakness without documented monoplegia. It is also not for paraplegia or hemiplegia.
Coding tip
Code the residual condition first and verify that the hemorrhage is documented as nontraumatic and remote.