G44.0Cluster headache syndrome
Code usage status
Primary diagnosis
May be used as the primary diagnosis
Apply only when it matches the confirmed diagnosis and the documented clinical record.
Specificity
Complete code in the classification
Use when the diagnosis matches and no exclusion applies.
- Chapter VI
- Diseases of the nervous system
- Group G40-G47
- Episodic and paroxysmal disorders
- Official Vietnamese name
- Hội chứng đau đầu từng cụm [chuỗi] [cluster]
- Additional WHO coding guidance
- Chronic paroxysmal hemicrania Cluster headache: chronic episodic
Related G44 codes
G44
Other headache syndromes
G44.1
Primary diagnosis candidate
Vascular headache, not elsewhere classified
G44.2
Primary diagnosis candidate
Tension-type headache
G44.3
Primary diagnosis candidate
Chronic post- traumatic headache
G44.4
Primary diagnosis candidate
Drug-induced headache, not elsewhere classified
G44.8
Primary diagnosis candidate
Other specified headache syndromes
Clinical record checklist
View coding guide →- Confirm that the code matches the final documented diagnosis.
- Use one primary-diagnosis code and record only relevant additional conditions.
- Review Ministry indicators, inclusions, exclusions and notes.
- Do not infer a diagnosis beyond the clinical record.
2026 regulatory basis
Indicators are taken from columns 24–29 of the classification accompanying Circular 06/2026/TT-BYT, cross-referenced with Decision 1849/QĐ-BYT and Official Dispatch 4059/BYT-BH.
