G44.009 – Cluster headache syndrome, unspecified, not intractable
ICD-10-CM 2027 diagnosis code · Episodic and paroxysmal disorders
ICD-10-CM code
G44.009
- Code
G44.009(claims format:G44009)- Description
- Cluster headache syndrome, unspecified, not intractable
- Billable
- Yes – valid for HIPAA-covered transactions
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 6. Diseases of the nervous system (G00-G99)
- Block
- G40-G47 Episodic and paroxysmal disorders
- Parent codes
- G44 › G44.0 › G44.00
Notes for G44.009
Applicable to:
- Cluster headache syndrome NOS
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
G44 – Other headache syndromes
Excludes1 (not coded here):
- headache NOS (R51.9)
Excludes2 (not included here):
G44.00 – Cluster headache syndrome, unspecified
Applicable to:
- Ciliary neuralgia
- Cluster headache NOS
- Histamine cephalgia
- Lower half migraine
- Migrainous neuralgia
Index terms for G44.009
Entries in the ICD-10-CM alphabetic index that lead to this code:
- Headache, cluster
- Headache, histamine
- Syndrome, cluster headache
- Neuralgia, neuralgic, ciliary
- Neuralgia, neuralgic, migrainous
- Cephalgia, cephalalgia, histamine
- Headache, cluster, not intractable
- Headache, histamine, not intractable
- Syndrome, cluster headache, not intractable
- Neuralgia, neuralgic, ciliary, not intractable
- Neuralgia, neuralgic, migrainous, not intractable
- Cephalgia, cephalalgia, histamine, not intractable
Related codes in G44.00
Frequently asked questions
What is ICD-10 code G44.009?
G44.009 is the ICD-10-CM code for cluster headache syndrome, unspecified, not intractable, in the block G40-G47 (Episodic and paroxysmal disorders).
Is G44.009 a billable code?
Yes. G44.009 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does G44.009 belong to?
It belongs to category G44 – Other headache syndromes.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.