All ICD10 Codes

G44.009

Billable
ChapterG00–G99
Ranksubcategory
Official Description

Cluster headache syndrome, unspecified, not intractable

Metadata & Insights
  • •2026 ICD-10-CM Edition - Effective October 1, 2025.
  • •Billable/specific code (valid for reimbursement).
  • •Chapter 6: Diseases of the Nervous System (G00-G99).

Instructional Notes

Includes
  • Cluster headache syndrome NOS
General instructions are available for the parent sections:
View CH6 NotesView G44 NotesView G44.00 Notes

Clinical Hierarchy

CH6Diseases of the nervous system (G00-G99)
G40-G47Episodic and paroxysmal disorders (G40-G47)
G44Other headache syndromes
G44.0Cluster headaches and other trigeminal autonomic cephalgias (TAC)
G44.00Cluster headache syndrome, unspecified
G44.009Cluster headache syndrome, unspecified, not intractable

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to G44.009:

subcategoryG44.00
Cluster headache syndrome, unspecified
View context instructions
categoryG44
Other headache syndromes
View context instructions
chapterCH6
Diseases of the nervous system (G00-G99)
View context instructions

Alphabetic Index Mentions

These are Diagnosis Index lookup paths that route to G44.009. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

12 raw paths
Cephalgia, cephalalgia2 unique routes
histamine→G44.009(2 variants)
not intractable→G44.009
Headache4 unique routes
cluster→G44.009(2 variants)
not intractable→G44.009
histamine→G44.009(2 variants)
not intractable→G44.009
Neuralgia, neuralgic (acute)4 unique routes
ciliary→G44.009(2 variants)
not intractable→G44.009
migrainous→G44.009(2 variants)
not intractable→G44.009
Syndrome2 unique routes
cluster headache→G44.009(2 variants)
not intractable→G44.009

MS-DRG Classification

2026 v43.1

This code is grouped within the following Diagnosis Related Group(s) for clinical reimbursement:

DRG 102
Headaches with MCC
DRG 103
Headaches without MCC

Cross Reference

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