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G44.00

Non-billable

Cluster headache syndrome, unspecified

G44.00 is the ICD-10-CM code for Cluster headache syndrome, unspecified. It is a non-billable category code — use a more specific child code such as G44.001 for billing.

Status
Header (non-billable)
Chapter
G00-G99
Parent
G44.0
Subcodes
2
Edition
FY2026

G00-G99 Diseases of the nervous system

Includes

  • •Ciliary neuralgia
  • •Cluster headache NOS
  • •Histamine cephalgia
  • •Lower half migraine
  • •Migrainous neuralgia

Frequently asked questions

What is ICD-10 code G44.00?
G44.00 is the ICD-10-CM code for "Cluster headache syndrome, unspecified". It falls under G00-G99 Diseases of the nervous system.
Is G44.00 a billable code?
No — G44.00 is a non-billable header code. Use a more specific child code (such as G44.001) for billing.
What are the subcodes of G44.00?
G44.00 has 2 more specific child codes, including G44.001, G44.009.

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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