ICD-10 Code K28.1 – Acute gastrojejunal ulcer with perforation (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K28.1 – Acute gastrojejunal ulcer with perforation
What it is
K28.1 identifies an acute ulcer at the gastrojejunal anastomosis that has perforated. It means the ulcer has created a hole through the wall, allowing leakage into the abdomen.
Clinical signs
Typical findings include sudden severe abdominal pain, guarding, and signs of peritoneal irritation. Clinical features vary; refer to documentation, especially for imaging or operative confirmation of perforation.
When to use this code
Use K28.1 when the record clearly documents an acute gastrojejunal ulcer with perforation, such as a postoperative marginal ulcer at a gastrojejunal anastomosis. You should code it when the provider confirms perforation, not just ulceration alone.
If the note describes a chronic ulcer, bleeding without perforation, or an ulcer at a different gastrointestinal site, this code is not appropriate. Check documentation for the exact location and acuity.
Do not use for
Do not use K28.1 for nonperforated gastrojejunal ulcers or for ulcers at other stomach or intestinal sites. Do not assume perforation unless the provider documents it clearly.
Coding tip
Verify both the anastomotic site and the word “perforation” in the chart before assigning K28.1.