C18Malignant neoplasm of colon
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 C18 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 ở đại tràng
Related C18 codes
C18.0
Primary diagnosis candidate
Caecum
C18.1
Primary diagnosis candidate
Appendix
C18.2
Primary diagnosis candidate
Ascending colon
C18.3
Primary diagnosis candidate
Hepatic flexure
C18.4
Primary diagnosis candidate
Transverse colon
C18.5
Primary diagnosis candidate
Splenic flexure
C18.6
Primary diagnosis candidate
Descending colon
C18.7
Primary diagnosis candidate
Sigmoid colon
C18.8
Primary diagnosis candidate
Overlapping lesion of colon
C18.9
Primary diagnosis candidate
Colon, unspecified
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.
