2026 ICD-10-CM Diagnosis Code K25.1Acute gastric ulcer with perforation

ICD-10-CM Codes›K00–K95›K20-K31›K25

ICD-10-CM K25.1
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K25.1 is a billable ICD-10-CM diagnosis code for acute gastric 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. Coders also document this condition as acute gastric ulcer with obstruction. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Gastroduodenal ulcer and Gastrointestinal and biliary perforation.

Code Identity

ICD-10-CM Code
K25.1
Billable Status
Yes — Valid for Submission
Code Describes
Acute gastric ulcer with perforation
Short Description
Acute gastric ulcer with perforation
Same as the full description in the CMS dataset.
Parent Code
K25
Gastric ulcer

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK20-K31Diseases of esophagus, stomach and duodenum
CategoryK25Gastric ulcer
This CodeK25.1Acute gastric 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
  • Acute gastric ulcer with perforation AND obstruction
  • Acute gastric ulcer with perforation but without obstruction
  • Acute peptic ulcer with perforation AND obstruction
  • Acute peptic ulcer with perforation but without obstruction
  • Gastric 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
      • stomach (eroded) (peptic) (round)
        • 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 K25.1 to ICD-9-CMHistory

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

ICD-9-CM
531.10 Ac stomach 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 K25.1Overview

Is K25.1 (Gastric ulcer) a billable code?

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

What MS-DRG does K25.1 group to?

When acute gastric 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 K25.1?

Under the General Equivalence Mappings, acute gastric ulcer with perforation converts to ICD-9-CM 531.10 (ac stomach 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.