2026 ICD-10-CM Diagnosis Code K26.4Chronic or unspecified duodenal ulcer with hemorrhage

ICD-10-CM Codes›K00–K95›K20-K31›K26

ICD-10-CM K26.4
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K26.4 is a billable ICD-10-CM diagnosis code for chronic or unspecified duodenal ulcer with hemorrhage. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 377 through 379. As a secondary diagnosis, it counts as a major complication or comorbidity (MCC) and places an inpatient stay in the highest severity level of its MS-DRG family. It does not count, however, when the principal diagnosis is one of 76 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Gastrointestinal hemorrhage.

Code Identity

ICD-10-CM Code
K26.4
Billable Status
Yes — Valid for Submission
Code Describes
Chronic or unspecified duodenal ulcer with hemorrhage
Short Description
Chronic or unspecified duodenal ulcer with hemorrhage
Same as the full description in the CMS dataset.
Parent Code
K26
Duodenal ulcer

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK20-K31Diseases of esophagus, stomach and duodenum
CategoryK26Duodenal ulcer
This CodeK26.4Chronic or unspecified duodenal ulcer with hemorrhage

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Chronic duodenal ulcer with hemorrhage
  • Chronic duodenal ulcer with hemorrhage AND obstruction
  • Chronic duodenal ulcer with hemorrhage but without obstruction
  • Chronic duodenal ulcer with obstruction
  • Chronic peptic ulcer with hemorrhage AND obstruction
  • Duodenal erosion
  • Duodenal ulcer with hemorrhage
  • Duodenal ulcer with hemorrhage AND obstruction
  • Duodenal ulcer with hemorrhage but without obstruction
  • Erosion of duodenum with hemorrhage

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR DIG021
Gastrointestinal hemorrhage
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Duodenal Ulcer

    a peptic ulcer located in the duodenum.

Patient EducationClinical

Gastrointestinal Bleeding

Your digestive or gastrointestinal (GI) tract includes the esophagus, stomach, small intestine, large intestine or colon, rectum, and anus. Bleeding can come from any of these areas. The amount of bleeding can be so small that only a lab test can find it.

Read the full article at MedlinePlus

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

Convert K26.4 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
532.40 Chr duoden ulcer w hem
Approximate The match is approximate rather than exact.

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 K26.4Overview

What is the ICD-10 code for chronic or unspecified duodenal ulcer with hemorrhage?

The ICD-10-CM code for chronic or unspecified duodenal ulcer with hemorrhage is K26.4 (sometimes written as K264). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Is K26.4 (Duodenal ulcer) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report chronic or unspecified duodenal ulcer with hemorrhage on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does K26.4 group to?

When chronic or unspecified duodenal ulcer with hemorrhage is the principal diagnosis on an inpatient stay, it groups to MS-DRG 377, 378, 379, with relative weights from 0.6304 to 1.8280 depending on complications. Higher weights mean higher Medicare reimbursement.

Is K26.4 a CC or MCC?

CMS lists K26.4 as an MCC (major complication or comorbidity) for FY 2026. Reported as a secondary diagnosis, it places the inpatient stay in the highest-weighted DRG of its severity family. It does not count when the principal diagnosis is one of the 76 closely related codes in its exclusion list.

What is the ICD-9 equivalent of K26.4?

Under the General Equivalence Mappings, chronic or unspecified duodenal ulcer with hemorrhage converts to ICD-9-CM 532.40 (chr duoden ulcer w hem). The mapping is approximate, so confirm the match fits the documentation.