ICD-10 Code K31.A19 – Gastric Intestinal Metaplasia Without Dysplasia, Unspecified Site (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K31.A19 – Gastric intestinal metaplasia without dysplasia, unspecified site
What it is
This code identifies intestinal metaplasia in the stomach without dysplasia when the exact gastric site is not specified. It means the stomach lining has changed to resemble intestinal tissue, but there is no documented precancerous change.
Clinical signs
Clinical features vary; refer to documentation. The finding is usually confirmed on gastric biopsy or pathology report, often during endoscopy, and may be noted with chronic gastritis or other gastric mucosal changes.
When to use this code
Use K31.A19 when the provider documents gastric intestinal metaplasia without dysplasia and does not specify the stomach location. Apply it when pathology confirms the condition and there is no mention of dysplasia. If the record names a specific site, code that site instead.
Do not use for
Do not use this code for intestinal metaplasia with dysplasia or for metaplasia outside the stomach. Check documentation if the report only says “gastric metaplasia” without confirming intestinal metaplasia.
Coding tip
Code only from explicit pathology or provider documentation, and verify whether the site is unspecified before selecting K31.A19.