ICD-10 Code I69.339 – Monoplegia of Upper Limb Following Cerebral Infarction Affecting Unspecified Side (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I69.339 – Monoplegia of upper limb following cerebral infarction affecting unspecified side
What it is
This code identifies a one-sided paralysis or severe weakness limited to an upper limb after a cerebral infarction, when the affected side is not specified. It is a late effect code, so the stroke is no longer acute.
Clinical signs
Typical findings include marked weakness or loss of voluntary movement in one arm, with reduced function in daily activities. Clinical features vary; refer to documentation if laterality or severity is unclear.
When to use this code
Use I69.339 when the record links the arm monoplegia to a prior cerebral infarction and the provider does not document whether the left or right side is affected. The acute stroke code should not be used for this residual condition.
It is appropriate for follow-up visits, rehabilitation notes, or chronic problem lists describing residual upper-limb deficits after ischemic stroke. Confirm that the documentation states a post-infarction sequela, not a new neurologic event.
Do not use for
Do not use this code for acute cerebral infarction, generalized hemiplegia, or monoplegia from another cause. Check documentation when the side is specified or when the deficit is not clearly post-stroke.
Coding tip
Always code the residual deficit from the stroke sequela, and verify whether laterality is documented before choosing an unspecified-side code.