G43.40Header code — not billable
Hemiplegic migraine, not intractable
- Chapter
- 6. Diseases of the nervous system
- Category
- G43
- Effective date
- October 1, 2026
Related codes in category G43
G43MigraineG43.0Migraine without auraG43.00Migraine without aura, not intractableG43.001Migraine w/o aura, not intractable, with status migrainosusYesG43.009Migraine w/o aura, not intractable, w/o status migrainosusYesG43.01Migraine without aura, intractableG43.011Migraine without aura, intractable, with status migrainosusYesG43.019Migraine w/o aura, intractable, without status migrainosusYesG43.1Migraine with auraG43.10Migraine with aura, not intractableG43.101Migraine with aura, not intractable, with status migrainosusYesG43.109Migraine with aura, not intractable, w/o status migrainosusYes
Frequently asked questions
What is ICD-10 code G43.40?
G43.40 is an ICD-10-CM diagnosis code for Hemiplegic migraine, not intractable.
Is G43.40 a billable code?
No. G43.40 is a category/header code, not billable on its own — use one of its more specific child codes instead.
What ICD-10-CM chapter is G43.40 in?
G43.40 falls under Chapter 6: Diseases of the nervous system.
When did G43.40 become effective?
G43.40 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to G43.40?
G43.40 belongs to category G43, which includes 12 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.