ICD-10-CM 2027 diagnosis code

K31.A1Gastric intestinal metaplasia without dysplasia

Not billable — use a more specific code

K31.A1 is a header code, so it can't be reported by itself. Choose one of the 6 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.A1

K31.A1 is the ICD-10-CM diagnosis code for gastric intestinal metaplasia without dysplasia. 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 6 subcodes must be used instead.

Within K31.A, choose K31.A1 (without dysplasia) only when documentation doesn't support a more specific option: unspecified (K31.A0) and with dysplasia (K31.A2).

To report this condition, pick the subcode that matches the documentation: K31.A11 (involving the antrum), K31.A12 (involving the body (corpus)), K31.A13 (involving the fundus), K31.A14 (involving the cardia), K31.A15 (involving multiple sites) and K31.A19 (unspecified site).

It was added in FY2022, effective October 1, 2021.

Specific codes under K31.A1

Notes that apply from higher levels

Instructions written at a parent level also apply to K31.A1.

› From K31 Other diseases of stomach and duodenum

Includes

functional disorders of stomach

Excludes2

diabetic gastroparesis (E08.43, E09.43, E10.43, E11.43, E13.43)
diverticulum of duodenum (K57.00-K57.13)

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.A1

Is K31.A1 billable?: No. K31.A1 is a header code. Report one of its more specific subcodes instead.