What does ICD-10 code K31.A0 mean?

ICD-10 code K31.A0 is the standardized code used for gastric intestinal metaplasia, unspecified in medical records and coding systems.

When is ICD-10 code K31.A0 used?

Doctors, hospitals, and insurers may use ICD-10 code K31.A0 when recording gastric intestinal metaplasia, unspecified in a standardized format.

Does ICD-10 code K31.A0 confirm a diagnosis?

No. A code helps standardize documentation and claims, but it should not be read as a substitute for a clinician's full assessment.

ICD10BillableValid for clinical use

ICD-10 Code K31.A0: Gastric intestinal metaplasia, unspecified

Name: ICD-10 Code K31.A0: Gastric intestinal metaplasia, unspecified
Creator: HealthAssure Clinical Team
Published: 2026-05-21T06:15:23.593Z

K31.A0 is a billable ICD-10 diagnosis code used to classify Gastric intestinal metaplasia, unspecified in medical records and claims. You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records. ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Diseases of the digestive system (K00-K95).

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

What is this code?

ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Diseases of the digestive system (K00-K95).

When is it used?

May be used when a clinician documents gastric intestinal metaplasia, unspecified in a patient's medical record.
May appear in hospital records, claims, referrals, and clinical documentation.
This code can be used as a clinically usable diagnosis entry in standardized coding workflows.

What it does not mean

A code alone does not explain severity, treatment plan, or outcome.
A medical code should not be treated as a substitute for a doctor's diagnosis or advice.

Code hierarchy

chapter

11Diseases of the digestive system (K00-K95)

block

K20-K31Diseases of esophagus, stomach and duodenum

Official coding notes

Inclusion terms

Gastric intestinal metaplasia indefinite for dysplasia
Gastric intestinal metaplasia NOS

Where you may see this code

You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.

Related specialists

GastroenterologistGeneral Physician

Sibling codes

K31.A1Gastric intestinal metaplasia without dysplasia K31.A2Gastric intestinal metaplasia with dysplasia

Coding guidelines

Common synonyms

Gastric intestinal metaplasia, unspecifiedGastric intestinal metaplasia

Frequently asked questions

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.