Z28.9Immunization not carried out for unspecified reason
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.
- Official Vietnamese name
- Không thực hiện được tiêm chủng vì lý do không xác định
Related Z28 codes
Z28
Immunization not carried out
Z28.0
Primary diagnosis candidate
Immunization not carried out because of contraindication
Z28.1
Primary diagnosis candidate
Immunization not carried out because of patient's decision for reasons of belief or group pressure
Z28.2
Primary diagnosis candidate
Immunization not carried out because of patient's decision for other and unspecified reasons
Z28.8
Primary diagnosis candidate
Immunization not carried out for other reasons
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.
