2026 ICD-10-CM Diagnosis Code K28.1Acute gastrojejunal ulcer with perforation

ICD-10-CM Codes›K00–K95›K20-K31›K28

ICD-10-CM K28.1
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K28.1 is a billable ICD-10-CM diagnosis code for acute gastrojejunal 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
K28.1
Billable Status
Yes — Valid for Submission
Code Describes
Acute gastrojejunal ulcer with perforation
Short Description
Acute gastrojejunal ulcer with perforation
Same as the full description in the CMS dataset.
Parent Code
K28
Gastrojejunal ulcer

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK20-K31Diseases of esophagus, stomach and duodenum
CategoryK28Gastrojejunal ulcer
This CodeK28.1Acute gastrojejunal ulcer with perforation

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute gastric ulcer with obstruction
  • Acute gastric ulcer with perforation AND obstruction
  • Acute gastrojejunal ulcer with obstruction
  • Acute gastrojejunal ulcer with perforation
  • Acute gastrojejunal ulcer with perforation AND obstruction
  • Acute gastrojejunal ulcer with perforation but without obstruction
  • Acute peptic ulcer with perforation AND obstruction
  • Acute peptic ulcer with perforation but without obstruction
  • Gastrojejunal ulcer with perforation AND obstruction
  • Gastrojejunal ulcer with perforation but without obstruction

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
      • gastrojejunal (peptic)
        • acute
          • 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

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 K28.1 to ICD-9-CMHistory

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

ICD-9-CM
534.10 Ac marginal 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 K28.1Overview

Is K28.1 (Gastrojejunal ulcer) a billable code?

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

What MS-DRG does K28.1 group to?

When acute gastrojejunal 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 K28.1?

Under the General Equivalence Mappings, acute gastrojejunal ulcer with perforation converts to ICD-9-CM 534.10 (ac marginal ulcer w perf). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.