ICD-10 Code K31.A0 – Gastric intestinal metaplasia, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K31.A0 – Gastric intestinal metaplasia, unspecified
What it is
K31.A0 identifies gastric intestinal metaplasia without further detail. It means the stomach lining has changed to resemble intestinal-type tissue, and the documentation does not specify a site or subtype.
Clinical signs
Clinical features vary; refer to documentation. This finding is usually identified on gastric biopsy, often during evaluation for gastritis, dyspepsia, or surveillance of premalignant gastric changes.
When to use this code
Use K31.A0 when the provider documents gastric intestinal metaplasia and does not specify a more precise location or type. It is appropriate when pathology confirms the finding but the note remains nonspecific. Check documentation if the record mentions dysplasia, Barrett’s esophagus, or another distinct diagnosis.
Do not use for
Do not use this code for intestinal metaplasia in another organ or for gastric dysplasia. If the provider documents a specific gastric site or a different stomach disorder, code that condition instead.
Coding tip
Code only what is clearly documented on pathology or in the assessment, and query for specificity when the gastric site or subtype is stated elsewhere.