ICD-10 Code G43.411 – Hemiplegic migraine, intractable, with status migrainosus (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G43.411 – Hemiplegic migraine, intractable, with status migrainosus
What it is
This code identifies hemiplegic migraine that does not respond well to treatment and is prolonged as status migrainosus. It reflects a migraine disorder with temporary motor weakness on one side of the body.
Clinical signs
Typical findings include migraine headache with reversible unilateral motor weakness and other aura symptoms. Clinical features vary; refer to documentation, especially for the prolonged attack consistent with status migrainosus.
When to use this code
Use this code when the record clearly documents hemiplegic migraine, notes that the episode is intractable, and states status migrainosus. You should confirm that the provider links the prolonged migraine episode to the hemiplegic subtype.
Code from the documentation, not from assumptions about headache severity or neurologic symptoms alone. If the chart does not specify intractable or status migrainosus, check documentation.
Do not use for
Do not use this code for ordinary migraine, migraine without motor weakness, or hemiplegic migraine without intractable status migrainosus. Check documentation when the subtype or episode duration is unclear.
Coding tip
Verify all three elements—hemiplegic, intractable, and status migrainosus—before assigning G43.411.