ICD-10 Code G43.401 – Hemiplegic migraine, not intractable, with status migrainosus (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G43.401 – Hemiplegic migraine, not intractable, with status migrainosus
What it is
This code identifies a hemiplegic migraine episode that is not documented as intractable and is accompanied by status migrainosus. Use it when the record supports migraine with temporary motor weakness and a prolonged attack.
Clinical signs
Look for migraine features with reversible unilateral weakness, often with aura, and an unusually prolonged or severe attack. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents hemiplegic migraine and also states status migrainosus, without describing the migraine as intractable. It fits ED, inpatient, or outpatient notes that clearly connect the prolonged attack to the hemiplegic migraine diagnosis. Check documentation if the record only says “migraine” or does not specify motor weakness.
Do not use for
Do not use this code for ordinary migraine without hemiplegia, or when status migrainosus is not documented. Also avoid it if the chart says intractable migraine instead; check documentation.
Coding tip
Code the highest level of specificity documented, and verify both hemiplegic migraine and status migrainosus before assigning G43.401.