ICD-10 Code K31.4 – Gastric diverticulum (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K31.4 – Gastric diverticulum
What it is
K31.4 identifies a gastric diverticulum, which is an outpouching of the stomach wall. Use it when documentation states a diverticulum arising from the stomach.
Clinical signs
Clinical features vary; refer to documentation. Some patients are asymptomatic, while others may have upper abdominal discomfort, dyspepsia, nausea, or incidental imaging findings.
When to use this code
Use K31.4 when the provider documents a gastric diverticulum as the diagnosis or imaging confirms a diverticulum of the stomach. Code it for confirmed stomach outpouching, including incidental findings that are clinically acknowledged. If the record is unclear about location, check documentation.
Do not use for
Do not use this code for diverticula of the small intestine, colon, or esophagus. Do not assign it when the report only mentions a suspected diverticulum without confirmation.
Coding tip
Verify that the diverticulum is gastric, not another GI location, before assigning K31.4.