G44.5Header code — not billable
Complicated headache syndromes
- Chapter
- 6. Diseases of the nervous system
- Category
- G44
- Effective date
- October 1, 2026
Related codes in category G44
G44Other headache syndromesG44.0Cluster headaches and oth trigeminal autonm cephalgias (TAC)G44.00Cluster headache syndrome, unspecifiedG44.001Cluster headache syndrome, unspecified, intractableYesG44.009Cluster headache syndrome, unspecified, not intractableYesG44.01Episodic cluster headacheG44.011Episodic cluster headache, intractableYesG44.019Episodic cluster headache, not intractableYesG44.02Chronic cluster headacheG44.021Chronic cluster headache, intractableYesG44.029Chronic cluster headache, not intractableYesG44.03Episodic paroxysmal hemicrania
Frequently asked questions
What is ICD-10 code G44.5?
G44.5 is an ICD-10-CM diagnosis code for Complicated headache syndromes.
Is G44.5 a billable code?
No. G44.5 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 G44.5 in?
G44.5 falls under Chapter 6: Diseases of the nervous system.
When did G44.5 become effective?
G44.5 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to G44.5?
G44.5 belongs to category G44, 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.