K31.9Disease of stomach and duodenum, unspecified
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 XI
- Diseases of the digestive system
- Group K20-K31
- Diseases of oesophagus, stomach and duodenum
- Official Vietnamese name
- Bệnh không xác định của dạ dày và/hoặc tá tràng
Related K31 codes
K31
Other diseases of stomach and duodenum
K31.0
Primary diagnosis candidate
Acute dilatation of stomach
K31.1
Primary diagnosis candidate
Adult hypertrophic pyloric stenosis
K31.2
Primary diagnosis candidate
Hourglass stricture and stenosis of stomach
K31.3
Primary diagnosis candidate
Pylorospasm, not elsewhere classified
K31.4
Primary diagnosis candidate
Gastric diverticulum
K31.5
Primary diagnosis candidate
Obstruction of duodenum
K31.6
Primary diagnosis candidate
Fistula of stomach and duodenum
K31.7
Primary diagnosis candidate
Polyp of stomach and duodenum
K31.8
Primary diagnosis candidate
Other specified diseases of stomach and duodenum
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.
