2026 ICD-10-CM Diagnosis Code K27.9Peptic ulcer, site unspecified, unspecified as acute or chronic, without hemorrhage or perforation

ICD-10-CM Codes›K00–K95›K20-K31›K27

ICD-10-CM K27.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K27.9 is a billable ICD-10-CM diagnosis code for peptic ulcer, site unspecified, unspecified as acute or chronic, without hemorrhage or 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 384. Coders also document this condition as drug-induced peptic ulcer. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Gastroduodenal ulcer.

Code Identity

ICD-10-CM Code
K27.9
Billable Status
Yes — Valid for Submission
Code Describes
Peptic ulcer, site unspecified, unspecified as acute or chronic, without hemorrhage or perforation
Short Description
Peptic ulc, site unsp, unsp as ac or chr, w/o hemor or perf
Parent Code
K27
Peptic ulcer, site unspecified

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK20-K31Diseases of esophagus, stomach and duodenum
CategoryK27Peptic ulcer, site unspecified
This CodeK27.9Peptic ulcer, site unspecified, unspecified as acute or chronic, without hemorrhage or perforation

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Drug-induced peptic ulcer
  • Exacerbation of peptic ulcer
  • Peptic anastomotic ulcer
  • Peptic ulcer
  • Peptic ulcer with obstruction
  • Peptic ulcer without hemorrhage AND without perforation
  • Peptic ulcer without hemorrhage AND without perforation but with obstruction
  • Peptic ulcer without hemorrhage, without perforation AND without obstruction
  • Stress ulcer
  • Stress ulcer of stomach

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.

    • Lesion(s) (nontraumatic)
      • peptic
    • Ulcer, ulcerated, ulcerating, ulceration, ulcerative
      • peptic (site unspecified)

Clinical ClassificationClinical

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

CCSR DIG005
Gastroduodenal ulcer
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Peptic Ulcer

    ulcer that occurs in the regions of the gastrointestinal tract which come into contact with gastric juice containing pepsin and gastric acid. it occurs when there are defects in the mucosa barrier. the common forms of peptic ulcers are associated with helicobacter pylori and the consumption of nonsteroidal anti-inflammatory drugs (nsaids).

  • Peptic Ulcer Hemorrhage

    bleeding from a peptic ulcer that can be located in any segment of the gastrointestinal tract.

  • Peptic Ulcer Perforation

    penetration of a peptic ulcer through the wall of duodenum or stomach allowing the leakage of luminal contents into the peritoneal cavity.

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 K27.9 to ICD-9-CMHistory

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

ICD-9-CM
533.90 Peptic ulcer NOS
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 K27.9Overview

Is K27.9 (Peptic ulcer, site unspecified) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report peptic ulcer, site unspecified, unspecified as acute or chronic, without hemorrhage or perforation on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does K27.9 group to?

When peptic ulcer, site unspecified, unspecified as acute or chronic, without hemorrhage or perforation is the principal diagnosis on an inpatient stay, it groups to MS-DRG 380, 381, 382, 383, 384, 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 K27.9?

Under the General Equivalence Mappings, peptic ulcer, site unspecified, unspecified as acute or chronic, without hemorrhage or perforation converts to ICD-9-CM 533.90 (peptic ulcer NOS). 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.