R99Other ill-defined and unspecified causes of mortality
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 XVIII
- Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
- Group R95-R99
- Ill-defined and unknown causes of mortality
- Official Vietnamese name
- Nguyên nhân tử vong không rõ ràng và/hoặc không xác định khác
- Additional WHO coding guidance
- Incl.: Death NOS Unknown cause of mortality
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.
