J22Unspecified acute lower respiratory infection
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 X
- Diseases of the respiratory system
- Group J20-J22
- Other acute lower respiratory infections
- Official Vietnamese name
- Nhiễm trùng hô hấp dưới cấp tính không xác định
- Additional WHO coding guidance
- Incl.: Acute (lower) respiratory (tract) infection NOS Excl.: respiratory infection NOS (J98.7) upper respiratory infection (acute) (J06.9)
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.
