ICD-10 Code K31.A12 – Gastric Intestinal Metaplasia Without Dysplasia, Involving the Body (Corpus) (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K31.A12 – Gastric intestinal metaplasia without dysplasia, involving the body (corpus)
What it is
This code identifies intestinal metaplasia in the stomach body (corpus) without dysplasia. It means the normal gastric lining has changed to a more 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 corpus and explicitly stating no dysplasia.
When to use this code
Use this code when the provider documents gastric intestinal metaplasia limited to the body of the stomach and confirms it is without dysplasia. Apply it for biopsy-proven findings, surveillance notes, or pathology reports that specify the corpus location. If the location or dysplasia status is unclear, check documentation.
Do not use for
Do not use this code if dysplasia is present or if the metaplasia is documented in another gastric site. If the report only says “gastric intestinal metaplasia” without location or dysplasia detail, check documentation.
Coding tip
Code the exact anatomic site and dysplasia status from pathology or the provider note.