2026 ICD-10-CM Diagnosis Code K26.5Chronic or unspecified duodenal ulcer with perforation

ICD-10-CM Codes›K00–K95›K20-K31›K26

ICD-10-CM K26.5
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K26.5 is a billable ICD-10-CM diagnosis code for chronic or unspecified duodenal ulcer with perforation. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 380 through 382. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Gastroduodenal ulcer and Gastrointestinal and biliary perforation.

Code Identity

ICD-10-CM Code
K26.5
Billable Status
Yes — Valid for Submission
Code Describes
Chronic or unspecified duodenal ulcer with perforation
Short Description
Chronic or unspecified duodenal ulcer with perforation
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 CodeK26.5Chronic or unspecified duodenal ulcer with perforation

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Chronic duodenal ulcer with obstruction
  • Chronic duodenal ulcer with perforation
  • Chronic duodenal ulcer with perforation AND obstruction
  • Chronic duodenal ulcer with perforation but without obstruction
  • Chronic peptic ulcer with perforation AND obstruction
  • Duodenal perforation
  • Duodenal rupture
  • Duodenal ulcer with perforation
  • Duodenal ulcer with perforation AND obstruction
  • Duodenal ulcer with perforation but without obstruction
  • Nontraumatic duodenal rupture
  • Rupture of intestine
  • Rupture of small intestine

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Ulcer, ulcerated, ulcerating, ulceration, ulcerative
      • duodenum, duodenal (eroded) (peptic)
        • with
          • perforation
    • Ulcer, ulcerated, ulcerating, ulceration, ulcerative
      • duodenum, duodenal (eroded) (peptic)
        • chronic (erosive)
          • with
            • perforation

Clinical ClassificationClinical

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

CCSR DIG005
Gastroduodenal ulcer
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR DIG006
Gastrointestinal and biliary perforation
Default principal diagnosis: inpatient No · outpatient No

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.

Convert K26.5 to ICD-9-CMHistory

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

ICD-9-CM
532.50 Chr duoden ulcer w perf
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 K26.5Overview

Is K26.5 (Duodenal ulcer) a billable code?

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

What MS-DRG does K26.5 group to?

When chronic or unspecified duodenal ulcer with perforation is the principal diagnosis on an inpatient stay, it groups to MS-DRG 380, 381, 382, with relative weights from 0.8006 to 1.9622 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of K26.5?

Under the General Equivalence Mappings, chronic or unspecified duodenal ulcer with perforation converts to ICD-9-CM 532.50 (chr duoden ulcer w perf). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.