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G44.00

⚠ Non-billable (Header)

Cluster headache syndrome, unspecified

Diseases of the nervous system (G00-G99)

⚠️ This is a category header code — not billable. Use a more specific child code below.

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Also Known As

Ciliary neuralgiaCluster headache NOSHistamine cephalgiaLower half migraineMigrainous neuralgia
✅ No additional coding notes for G44.00

Child Codes (2)

G44.001Cluster headache syndrome, unspecified, intractableG44.009Cluster headache syndrome, unspecified, not intractable

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Code Information

CodeG44.00
BillableNo — Header code
ParentG44.0
CategoryDiseases of the nervous system (G00-G99)
Excludes10 rule(s)
Excludes20 note(s)
Child codes2

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)