ICD-10-CM › K00-K95 › K20-K31 › K31 Other diseases of stomach and duodenum › K31.9
Disease of stomach and duodenum, unspecified
ValidICD-10-CM diagnosis code.
Valid for claims with a date of service in the current code year.
What has happened to this code
Every change the publisher made, from 2007 to now. Entries marked draft are from the pre-implementation releases: ICD-10 took effect on 1 October 2015, so nothing before FY2016 was ever valid on a claim.
- FY2007 Added to the draft code set draft Disease of stomach and duodenum, unspecified
Official coding rules
Published by CDC for FY2027. A rule attached to a category binds every code beneath it, so the rules inherited from this code's ancestors are shown with the code they come from.
Inherited from K31 Other diseases of stomach and duodenum
Excludes2 - not included here
- diabetic gastroparesis (E08.43, E09.43, E10.43, E11.43, E13.43)
- diverticulum of duodenum (K57.00-K57.13)
Includes
- functional disorders of stomach
Inherited from the K20-K31 section Diseases of esophagus, stomach and duodenum (K20-K31)
Excludes2 - not included here
- hiatus hernia (K44.-)
How CDC's index refers to this code
Wording from the official alphabetic index. Much of it appears nowhere in the code description, which is why a search for the everyday phrase so often finds nothing.
- Malfunction
- Disorder > stomach
- Disease, diseased > gastric
- Gastropathy
- Lesion > cardia
- Lesion > gastric
- Lesion > pylorus
- Lesion > stomach
- Lesion > duodenum
- Disorder > gastric
- Disturbance > stomach
- Dysfunction > pylorus
- Lesion > gastroduodenal
- Disease, diseased > stomach
- Disease, diseased > duodenum
Codes in the same group
| Code | Description | Status |
|---|---|---|
| K31.0 | Acute dilatation of stomach | Valid |
| K31.1 | Adult hypertrophic pyloric stenosis | Valid |
| K31.2 | Hourglass stricture and stenosis of stomach | Valid |
| K31.3 | Pylorospasm, not elsewhere classified | Valid |
| K31.4 | Gastric diverticulum | Valid |
| K31.5 | Obstruction of duodenum | Valid |
| K31.6 | Fistula of stomach and duodenum | Valid |
| K31.7 | Polyp of stomach and duodenum | Valid |
| K31.8 | Other specified diseases of stomach and duodenum | Not billable |
| K31.A | Gastric intestinal metaplasia | Not billable |
| K31.B | Hypertrophic pyloric stenosis, in childhood | Valid |