ICD-10-CM · Chapter 6 · G00–G99
G44.021
Chronic cluster headache, intractable
Diseases of the nervous system
Quick facts
- Code
- G44.021
- Type
- Billable code
- ICD-10-CM chapter
- Chapter 6 — Diseases of the nervous system
- Category
- G44 — Other headache syndromes
- Specificity
- 6 characters
How coders use this code
ICD-10-CM G44.021 is a billable, fully specified code, so it can be reported directly on a claim to document a diagnosis of chronic cluster headache, intractable. Coders assign it when the chart documentation supports this level of detail, always matching to the most specific code available and verifying against the chapter-specific guidelines published annually by NCHS/CMS.
Related codes in G44
- G44Other headache syndromes
- G44.0Cluster headaches and other trigeminal autonomic cephalgias (TAC)
- G44.00Cluster headache syndrome, unspecified
- G44.001Cluster headache syndrome, unspecified, intractable
- G44.009Cluster headache syndrome, unspecified, not intractable
- G44.01Episodic cluster headache
- G44.011Episodic cluster headache, intractable
- G44.019Episodic cluster headache, not intractable
- G44.02Chronic cluster headache
- G44.029Chronic cluster headache, not intractable
- G44.03Episodic paroxysmal hemicrania
- G44.031Episodic paroxysmal hemicrania, intractable
- G44.039Episodic paroxysmal hemicrania, not intractable
- G44.04Chronic paroxysmal hemicrania
- G44.041Chronic paroxysmal hemicrania, intractable
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