ICD-10 Code K31.A13 – Gastric intestinal metaplasia without dysplasia, involving the fundus (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K31.A13 – Gastric intestinal metaplasia without dysplasia, involving the fundus
What it is
This code identifies intestinal metaplasia in the gastric fundus without dysplasia. It means the normal stomach lining has changed to a different cell type, but no precancerous abnormality is documented.
Clinical signs
Clinical features vary; refer to documentation. Diagnosis is usually based on endoscopic biopsy showing intestinal metaplasia in the fundus and explicitly stating no dysplasia.
When to use this code
Use this code when the pathology report or provider note documents gastric intestinal metaplasia without dysplasia and specifies the fundus. Code it when the site and absence of dysplasia are clearly stated. Check documentation if the biopsy location is different or not specified.
Do not use for
Do not use this code if dysplasia is present, if the metaplasia involves a different gastric site, or if the record only says “gastric intestinal metaplasia” without fundus detail. Check documentation.
Coding tip
Match the code to both the anatomic site and the absence of dysplasia; if either is missing, query or review the pathology report.