ICD-10-CM 2027 diagnosis code
K31.AGastric intestinal metaplasia
K31.A is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it.
Code last changed in FY2022 (effective October 1, 2021). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About K31.A
K31.A is the ICD-10-CM diagnosis code for gastric intestinal metaplasia. It belongs to category K31 (other diseases of stomach and duodenum), 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 3 subcodes must be used instead.
Within K31 (other diseases of stomach and duodenum), K31.A is specifically for gastric intestinal metaplasia. Related codes cover acute dilatation of stomach (K31.0), adult hypertrophic pyloric stenosis (K31.1), Hourglass stricture and stenosis of stomach (K31.2), Pylorospasm, not elsewhere classified (K31.3), gastric diverticulum (K31.4), obstruction of duodenum (K31.5), fistula of stomach and duodenum (K31.6), polyp of stomach and duodenum (K31.7) and 3 more.
To report this condition, pick the subcode that matches the documentation: K31.A0 (unspecified), K31.A1 (without dysplasia) and K31.A2 (with dysplasia).
It was added in FY2022, effective October 1, 2021.
Specific codes under K31.A
- 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
Notes that apply from higher levels
Instructions written at a parent level also apply to K31.A.
Broader instructions also apply from K20-K31 Diseases of esophagus, stomach and duodenum and Chapter 11: Diseases of the digestive system.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2022 (effective 10/1/2021): Added
- No changes since FY2022.
Common questions about K31.A
Is K31.A billable?
- No. K31.A is a header code. Report one of its more specific subcodes instead.