ICD-10 Code G81.90 – Hemiplegia, unspecified affecting unspecified side (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G81.90 – Hemiplegia, unspecified affecting unspecified side
What it is
G81.90 identifies hemiplegia, meaning paralysis affecting one side of the body, when the side is not documented. Use this code when the record confirms hemiplegia but does not specify right or left.
Clinical signs
Typical findings include marked weakness or paralysis of one arm and one leg on the same side. Clinical features vary; refer to documentation for the exact side, severity, and whether the condition is complete or partial.
When to use this code
Use G81.90 when the provider documents hemiplegia without naming the affected side. It may appear in neurologic assessments, problem lists, or discharge summaries when laterality is missing. If the chart later specifies right or left, code the documented side instead.
Do not use for
Do not use this code for hemiparesis, generalized weakness, or transient symptoms without confirmed hemiplegia. Check documentation if the record describes stroke sequelae, because a more specific hemiplegia code may apply.
Coding tip
Always look for laterality in the note before assigning G81.90, because unspecified codes should be used only when the side is truly not documented.