I48.4Atypical atrial flutter
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 IX
- Diseases of the circulatory system
- Group I30-I52
- Other forms of heart disease
- Official Vietnamese name
- Cuồng nhĩ không điển hình
- Additional WHO coding guidance
- Type II atrial flutter
Related I48 codes
I48
Atrial fibrillation and flutter
I48.0
Primary diagnosis candidate
Paroxysmal atrial fibrillation
I48.1
Primary diagnosis candidate
Persistent atrial fibrillation
I48.2
Primary diagnosis candidate
Chronic atrial fibrillation
I48.3
Primary diagnosis candidate
Typical atrial flutter
I48.9
Primary diagnosis candidate
Atrial fibrillation and atrial flutter, unspecified
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.
