2026 ICD-10-CM Diagnosis Code K26Duodenal ulcer

ICD-10-CM Codes›K00–K95›K20-K31›K26

ICD-10-CM K26
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K26 is a non-billable ICD-10-CM category code for duodenal ulcer, so it cannot be submitted on claims. Use a more specific code from this category instead, such as K26.0, K26.1, K26.2, and K26.3.

Code Identity

ICD-10-CM Code
K26
Billable Status
No — Non-Billable Category
Code Describes
Duodenal ulcer
Chapter
K20-K31
Diseases of esophagus, stomach and duodenum

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK20-K31Diseases of esophagus, stomach and duodenum
CategoryK26Duodenal ulcer
This CodeK26Duodenal ulcer

Specific Coding for Duodenal ulcerOverview

Non-specific codes like K26 require more characters. Use one of these billable codes instead:

  • Use K26.0 for Acute duodenal ulcer with hemorrhage

  • Use K26.1 for Acute duodenal ulcer with perforation

  • Use K26.2 for Acute duodenal ulcer with both hemorrhage and perforation

  • Use K26.3 for Acute duodenal ulcer without hemorrhage or perforation

  • Use K26.4 for Chronic or unspecified duodenal ulcer with hemorrhage

  • Use K26.5 for Chronic or unspecified duodenal ulcer with perforation

  • Use K26.6 for Chronic or unspecified duodenal ulcer with both hemorrhage and perforation

  • Use K26.7 for Chronic duodenal ulcer without hemorrhage or perforation

  • Use K26.9 for Duodenal ulcer, unspecified as acute or chronic, without hemorrhage or perforation

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Includes

  • erosion (acute) of duodenum
  • duodenum ulcer (peptic)
  • postpyloric ulcer (peptic)

Use Additional Code

  • code to identify:
  • alcohol abuse and dependence F10

Type 1 Excludes

  • peptic ulcer NOS K27

Clinical InformationClinical

  • Duodenal Ulcer

    a peptic ulcer located in the duodenum.

Patient EducationClinical

Peptic Ulcer

A peptic ulcer is a sore in the lining of your stomach or your duodenum, the first part of your small intestine. A burning stomach pain is the most common symptom. The pain:

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About K26Overview

Is K26 (Duodenal ulcer) a billable code?

No. This is a category header that groups the codes for duodenal ulcer, and headers cannot be submitted on claims. Claims for duodenal ulcer need a more specific code from this category, such as K26.0, K26.1, and K26.2.