ICD-10-CM 2027 diagnosis code
K31Other diseases of stomach and duodenum
K31 is a header code, so it can't be reported by itself. Choose one of the 12 more specific codes beneath it.
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About K31
K31 is the ICD-10-CM diagnosis code for other diseases of stomach and duodenum. It belongs to block K20-K31 (diseases of esophagus, stomach and duodenum) and chapter 11 (diseases of the digestive system). It is a header code, so it can't be reported by itself; one of its 12 subcodes must be used instead.
To report this condition, pick the subcode that matches the documentation: K31.0 (stomach), K31.1 (stenosis), K31.2 (stomach), K31.3 (classified), K31.4 (diverticulum), K31.5 (duodenum), K31.6 (duodenum), K31.7 (duodenum) and 4 more.
The conditions in its Excludes2 note aren't part of K31, but may be coded alongside it if the patient has both: diabetic gastroparesis (E08.43, E09.43, E10.43, E11.43, E13.43) and diverticulum of duodenum (K57.00-K57.13).
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Specific codes under K31
- K31.0Acute dilatation of stomachBillable
- K31.1Adult hypertrophic pyloric stenosisBillable
- K31.2Hourglass stricture and stenosis of stomachBillable
- K31.3Pylorospasm, not elsewhere classifiedBillable
- K31.4Gastric diverticulumBillable
- K31.5Obstruction of duodenumBillable
- K31.6Fistula of stomach and duodenumBillable
- K31.7Polyp of stomach and duodenumBillable
- K31.8Other specified diseases of stomach and duodenum
- K31.9Disease of stomach and duodenum, unspecifiedBillable
- K31.AGastric intestinal metaplasia
- K31.A0Gastric intestinal metaplasia, unspecifiedBillable
- K31.A1Gastric intestinal metaplasia without dysplasia
- K31.A11Gastric intestinal metaplasia without dysplasia, involving the antrumBillable
- K31.A12Gastric intestinal metaplasia without dysplasia, involving the body (corpus)Billable
- K31.A13Gastric intestinal metaplasia without dysplasia, involving the fundusBillable
- K31.A14Gastric intestinal metaplasia without dysplasia, involving the cardiaBillable
- K31.A15Gastric intestinal metaplasia without dysplasia, involving multiple sitesBillable
- K31.A19Gastric intestinal metaplasia without dysplasia, unspecified siteBillable
- K31.A2Gastric intestinal metaplasia with dysplasia
- K31.BHypertrophic pyloric stenosis, in childhoodBillable
Coding notes
Notes that apply from higher levels
Instructions written at a parent level also apply to K31.
Broader instructions also apply from K20-K31 Diseases of esophagus, stomach and duodenum and Chapter 11: Diseases of the digestive system.
Codes whose notes reference K31
- K59Excludes2
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about K31
Is K31 billable?
- No. K31 is a header code. Report one of its more specific subcodes instead.