G43.401 Hemiplegic migraine, not intractable, with status migrainosus

ICD-10-CM G43.401: Hemiplegic Migraine, Not Intractable, With Status Migrainosus

ICD-10-CM code G43.401 identifies hemiplegic migraine that is not intractable and occurs with status migrainosus. Hemiplegic migraine involves motor weakness during aura. The code is active and falls under the parent concept G43.40. This reference summarizes terminology, clinical context, and documentation considerations for this diagnosis. 1 2

Plain-language overview

Hemiplegic migraine is a rare subtype of migraine with aura that includes motor weakness, and it can occur sporadically or run in families. This clinical background helps readers understand the condition linked to G43.401. 2

What this code represents

G43.401 is an active ICD-10-CM diagnosis code representing hemiplegic migraine, not intractable, with status migrainosus, and its parent concept is G43.40. 1

The semantic type assigned to G43.401 in the terminology record is Disease or Syndrome, and the code has narrower concepts within the same terminology. 1

Coding details

G43.401 appears in a list distinguishing it from other hemiplegic migraine variants, including intractable forms and cases without status migrainosus, which supports precise code selection. 3

G43.401 is included in an ICD-10 code list used as an explanatory variable, distinguishing it from G43.119, which represents migraine with aura, intractable, without status migrainosus. 5

Documentation considerations

The official terminology record for G43.401 provides an abbreviated label of hemiplegic migraine, not intractable, with status migrainosus, along with its full preferred name. 1

Diagnosis of hemiplegic migraine is primarily clinical and can be challenging, and the condition is characterized by the presence of motor weakness as an aura manifestation. 2

What the sources add

While one source provides the official terminology and hierarchy for G43.401, another adds clinical context about hemiplegic migraine features, and a third lists related code variants for comparison. 1 2 3

Coverage and utilization context

G43.401 appears in an ICD-10 code list used as an explanatory variable in research, and it is also listed alongside other hemiplegic migraine variants in a phecode mapping resource. 3 5

Sources

1. ICD-10-CM G43.401 terminology record — National Cancer Institute Enterprise Vocabulary Services; accessed 2026-07-27.
2. Bookshelf — ncbi.nlm.nih.gov; accessed 2026-07-27.
3. Phecode 340 · ExPRSweb — csg.sph.umich.edu; accessed 2026-07-27.
4. Hemiplegic Migraine, Not Intractable, With Status Migrainosus | ICD-10-CM G43.401 Clinical Guide — sprypt.com; accessed 2026-07-27.
5. ICD-9 and ICD-10 codes used as explanatory variable — cdn-links.lww.com; accessed 2026-07-27.