ICD-10 Code K26 – Duodenal Ulcer (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K26 – Duodenal ulcer
What it is
K26 identifies an ulcer in the duodenum, the first part of the small intestine. Use it when documentation states a duodenal ulcer without a more specific complication or site detail.
Clinical signs
Typical findings include epigastric pain, dyspepsia, nausea, or evidence of upper gastrointestinal bleeding. Clinical features vary; refer to documentation.
When to use this code
Use K26 when the record clearly documents duodenal ulcer disease and does not specify gastric, peptic, or other ulcer location instead. It may also apply when a clinician confirms a duodenal ulcer during endoscopy or other standard evaluation. Check documentation for any associated bleeding, perforation, or obstruction, since those details may require a different code.
Do not use for
Do not use K26 for gastric ulcer, peptic ulcer disease without duodenal location, or nonspecific abdominal pain. If the chart does not confirm a duodenal ulcer, check documentation.
Coding tip
Look for the exact ulcer site and any complication wording before assigning K26.