G44.001 Cluster headache syndrome, unspecified, intractable
ICD-10-CM · CMS code reference
Official ICD-10-CM description: Cluster headache syndrome, unspecified, intractable
Coding notes
From the ICD-10-CM FY2027 (effective October 1, 2026) tabular list. Notes on a parent code or category apply here too.
Excludes1
Not coded together with this code. The exception is when the two conditions are unrelated to each other.
- headache NOS (R51.9)
Excludes2
Not part of this code, but both can be coded when both are documented.
- atypical facial pain (G50.1)
- headache due to lumbar puncture (G97.1)
- migraines (G43.-)
- trigeminal neuralgia (G50.0)
Related codes
G44.009Cluster headache syndrome, unspecified, not intractable ICD-10-CMG44.011Episodic cluster headache, intractable ICD-10-CMG44.019Episodic cluster headache, not intractable ICD-10-CMG44.021Chronic cluster headache, intractable ICD-10-CMG44.029Chronic cluster headache, not intractable ICD-10-CMG44.031Episodic paroxysmal hemicrania, intractable ICD-10-CMG44.039Episodic paroxysmal hemicrania, not intractable ICD-10-CMG44.041Chronic paroxysmal hemicrania, intractable ICD-10-CM
Common questions
Is G44.001 a billable code?
Yes. G44.001 is a billable ICD-10-CM code in the ICD-10-CM FY2027 (effective October 1, 2026) code set.