K31.8 ICD-10-CA subcategory: Other specified diseases of stomach and duodenum
K31.8 isn’t a code on its own. Choose one of the 3 codes beneath it, the one the documentation supports.
Official description
K31.8Other specified diseases of stomach and duodenum
ICD-10-CA · Canada · Also written K318
Codes in K31.8
K31.8 isn’t a code on its own. Open the code that matches what the note documents.
Notes for K31.8
As CIHI prints them, with any note K31.8 takes from the headings above it.
Includes
- Functional disorders of stomachFrom K31 Other diseases of stomach and duodenum
Excludes
Conditions classified elsewhere.
- Dieulafoy's ulcer of stomach (K25.0)
- Diverticulum of duodenum (K57.0-K57.1)gastrointestinal haemorrhage (K92.0-K92.2)From K31 Other diseases of stomach and duodenum
- Hiatus hernia (K44.-)From K20-K31 Diseases of oesophagus, stomach and duodenum
- Certain:• conditions originating in the perinatal period (P00-P96)• infectious and parasitic diseases (A00-B99)complications of pregnancy, childbirth and the puerperium (O00-O99)congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)endocrine, nutritional and metabolic diseases (E00-E90)injury, poisoning and certain other consequences of external causes (S00-T98)neoplasms (C00-D48)symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)From Chapter 11: Diseases of the digestive system (K00-K93)
Where K31.8 sits
- 1ChapterChapter 11: Diseases of the digestive system (K00-K93)
- 2Block K20-K31Diseases of oesophagus, stomach and duodenum
- 3Category K31Other diseases of stomach and duodenum
- 4Subcategory K31.8Other specified diseases of stomach and duodenum
Source and release
- Data release
- ICD-10-CA · FY 2026–2027
- Effective date
- Apr 1, 2026
- Publisher
- CIHI
This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
Is K31.8 a valid ICD-10-CA code?
No. K31.8 (Other specified diseases of stomach and duodenum) is a subcategory heading in CIHI’s ICD-10-CA FY 2026–2027 release. It holds 3 codes; record the one the documentation supports.
Where is K31.8 in ICD-10-CA?
K31.8 sits under K31 Other diseases of stomach and duodenum, within K20-K31 Diseases of oesophagus, stomach and duodenum, within Chapter 11: Diseases of the digestive system (K00-K93).
What coding notes apply to K31.8?
ICD-10-CA lists Excludes, Includes notes for K31.8, including those from the headings it sits under. They are listed on this page with where each one comes from.
Which ICD-10-CA release does this page use?
It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.
Codes beside K31.8
View K31K31.0Acute dilatation of stomachK31.1Adult hypertrophic pyloric stenosisK31.2Hourglass stricture and stenosis of stomachK31.3Pylorospasm, not elsewhere classifiedK31.4Gastric diverticulumK31.5Obstruction of duodenumK31.6Fistula of stomach and duodenumK31.7Polyp of stomach and duodenumK31.9Disease of stomach and duodenum, unspecified