ICD-10 Code K31.A11 – Gastric intestinal metaplasia without dysplasia, involving the antrum (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K31.A11 – Gastric intestinal metaplasia without dysplasia, involving the antrum
What it is
This code identifies intestinal metaplasia in the stomach antrum without dysplasia. It means the normal gastric lining has changed to an intestinal-type lining, but there is no documented precancerous cellular change.
Clinical signs
Clinical features vary; refer to documentation. Diagnosis is usually based on endoscopic biopsy showing intestinal metaplasia in the antrum and explicitly stating no dysplasia.
When to use this code
Use this code when the pathology or provider documentation specifies gastric intestinal metaplasia without dysplasia and localizes it to the antrum. It is appropriate for biopsy-confirmed findings, surveillance visits, or follow-up after endoscopy. If the record does not clearly state both location and absence of dysplasia, check documentation.
Do not use for
Do not use this code if dysplasia is present, if the metaplasia involves a different gastric site, or if the documentation only says “intestinal metaplasia” without anatomic detail. Check documentation.
Coding tip
Match the code to the exact pathology wording, especially “without dysplasia” and “antrum,” before assigning K31.A11.