G44.021Billable
Chronic cluster headache, intractable
- 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 headacheG44.029Chronic cluster headache, not intractableYesG44.03Episodic paroxysmal hemicraniaG44.031Episodic paroxysmal hemicrania, intractableYes
Frequently asked questions
What is ICD-10 code G44.021?
G44.021 is an ICD-10-CM diagnosis code for Chronic cluster headache, intractable.
Is G44.021 a billable code?
Yes. G44.021 is billable and specific enough to be used on a claim.
What ICD-10-CM chapter is G44.021 in?
G44.021 falls under Chapter 6: Diseases of the nervous system.
When did G44.021 become effective?
G44.021 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to G44.021?
G44.021 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.