C00.4Lower lip, inner aspect
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 II
- Neoplasms
- Group C00-C97
- Malignant neoplasms U ác tính
- Official Vietnamese name
- U ác tính ở môi dưới, mặt trong
- Additional WHO coding guidance
- Lower lip: buccal aspect frenulum mucosa oral aspect
Related C00 codes
C00
Malignant neoplasm of lip
C00.0
Primary diagnosis candidate
External upper lip
C00.1
Primary diagnosis candidate
External lower lip
C00.2
Primary diagnosis candidate
External lip, unspecified
C00.3
Primary diagnosis candidate
Upper lip, inner aspect
C00.5
Primary diagnosis candidate
Lip, unspecified, inner aspect
C00.6
Primary diagnosis candidate
Commissure of lip
C00.8
Primary diagnosis candidate
Overlapping lesion of lip
C00.9
Primary diagnosis candidate
Lip, 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.
