ICD-10-CM diagnosis code
G44.021 Chronic cluster headache, intractable
- Billable
- Yes, a complete code (FY2026)
- Category
- G44 Other headache syndromes
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Other codes in G44
40 complete codes in this category.
- G44.001Cluster headache syndrome, unspecified, intractable
- G44.009Cluster headache syndrome, unspecified, not intractable
- G44.011Episodic cluster headache, intractable
- G44.019Episodic cluster headache, not intractable
- G44.021Chronic cluster headache, intractable
- G44.029Chronic cluster headache, not intractable
- G44.031Episodic paroxysmal hemicrania, intractable
- G44.039Episodic paroxysmal hemicrania, not intractable
- G44.041Chronic paroxysmal hemicrania, intractable
- G44.049Chronic paroxysmal hemicrania, not intractable
- G44.051Short lasting unilateral neuralgiform headache with conjunctival injection and tearing (SUNCT), intractable
- G44.059Short lasting unilateral neuralgiform headache with conjunctival injection and tearing (SUNCT), not intractable
Documentation tips
- Make sure the note supports every element of the title, “Chronic cluster headache, intractable”: each detail in it should be traceable to the history, examination or assessment.
- Code to the highest specificity the documentation supports. If a detail is missing from the note, add it to the note rather than choosing a less specific code by default.
- Check the Tabular List and official guidelines for instructional notes (“code first”, “use additional code”, Excludes1/Excludes2) that apply to G44.
The international WHO ICD-10 also has G44, with its inclusion and exclusion notes; titles and detail can differ from ICD-10-CM.
ICD-10-CM is developed by the National Center for Health Statistics (NCHS), Centers for Disease Control and Prevention, U.S. Department of Health and Human Services, and is based on the WHO ICD-10. Codes and titles are reproduced unchanged from the FY2026 code list (effective 1 October 2025). Their use here does not imply endorsement by CDC, HHS or the U.S. Government. Changes effective on or after 1 October 2026 may not be reflected yet; check the current release at cdc.gov or cms.gov before submitting claims.
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