C79Secondary malignant neoplasm of other and unspecified sites
Code usage status
Primary diagnosis
Select a more specific code
Apply only when it matches the confirmed diagnosis and the documented clinical record.
Specificity
Do not use C79 directly
Use the most specific code supported by the record.
- Chapter II
- Neoplasms
- Group C00-C97
- Malignant neoplasms U ác tính
- Official Vietnamese name
- U ác tính thứ phát ở vị trí khác và/hoặc không xác định
Related C79 codes
C79.0
Primary diagnosis candidate
Secondary malignant neoplasm of kidney and renal pelvis
C79.1
Primary diagnosis candidate
Secondary malignant neoplasm of bladder and other and unspecified urinary organs
C79.2
Primary diagnosis candidate
Secondary malignant neoplasm of skin
C79.3
Primary diagnosis candidate
Secondary malignant neoplasm of brain and cerebral meninges
C79.4
Primary diagnosis candidate
Secondary malignant neoplasm of other and unspecified parts of nervous system
C79.5
Primary diagnosis candidate
Secondary malignant neoplasm of bone and bone marrow
C79.6
Primary diagnosis candidate
Secondary malignant neoplasm of ovary
C79.7
Primary diagnosis candidate
Secondary malignant neoplasm of adrenal gland
C79.8
Primary diagnosis candidate
Secondary malignant neoplasm of other specified sites
C79.9
Primary diagnosis candidate
Secondary malignant neoplasm, unspecified site
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.
