Z20.9Contact with and exposure to unspecified communicable disease
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
- Tiếp xúc và/hoặc phơi nhiễm với bệnh truyền nhiễm không xác định
Related Z20 codes
Z20
Contact with and exposure to communicable diseases
Z20.0
Primary diagnosis candidate
Contact with and exposure to intestinal infectious diseases
Z20.1
Primary diagnosis candidate
Contact with and exposure to tuberculosis
Z20.2
Primary diagnosis candidate
Contact with and exposure to infections with a predominantly sexual mode of transmission
Z20.3
Primary diagnosis candidate
Contact with and exposure to rabies
Z20.4
Primary diagnosis candidate
Contact with and exposure to rubella
Z20.5
Primary diagnosis candidate
Contact with and exposure to viral hepatitis
Z20.6
Primary diagnosis candidate
Contact with and exposure to human immunodeficiency virus [HIV]
Z20.7
Primary diagnosis candidate
Contact with and exposure to pediculosis, acariasis and other infestations
Z20.8
Primary diagnosis candidate
Contact with and exposure to other communicable diseases
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.
