2026 ICD-10-CM Diagnosis Code K26.9Duodenal ulcer, unspecified as acute or chronic, without hemorrhage or perforation

ICD-10-CM Codes›K00–K95›K20-K31›K26

ICD-10-CM K26.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K26.9 is a billable ICD-10-CM diagnosis code for duodenal ulcer, 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Gastroduodenal ulcer.

Code Identity

ICD-10-CM Code
K26.9
Billable Status
Yes — Valid for Submission
Code Describes
Duodenal ulcer, unspecified as acute or chronic, without hemorrhage or perforation
Short Description
Duodenal ulcer, unsp as acute or chronic, w/o hemor or perf
Parent Code
K26
Duodenal ulcer

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK20-K31Diseases of esophagus, stomach and duodenum
CategoryK26Duodenal ulcer
This CodeK26.9Duodenal ulcer, unspecified as acute or chronic, without hemorrhage or perforation

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Abnormal hormone secretion
  • Abnormality of secretion of gastrin
  • Cancerous ulcer
  • Childhood duodenal ulcer
  • Chronic duodenitis
  • Chronic inflammatory small bowel disease
  • Combined gastric AND duodenal ulcer
  • Duodenal erosion
  • Duodenal ulcer caused by alcohol
  • Duodenal ulcer caused by bacterium
  • Duodenal ulcer caused by drug
  • Duodenal ulcer caused by fungus
  • Duodenal ulcer caused by Helicobacter pylori
  • Duodenal ulcer caused by Helicobacter pylori and non-steroidal anti-inflammatory agent
  • Duodenal ulcer caused by non-steroidal anti-inflammatory drug
  • Duodenal ulcer caused by virus
  • Duodenal ulcer due to celiac disease
  • Duodenal ulcer due to Crohn disease
  • Duodenal ulcer due to IgA vasculitis
  • Duodenal ulcer due to sarcoidosis
  • Duodenal ulcer due to vasculitis
  • Duodenal ulcer due to Zollinger-Ellison syndrome
  • Duodenal ulcer induced by platelet aggregation inhibitor
  • Duodenal ulcer with increased serum pepsinogen I
  • Duodenal ulcer without hemorrhage AND without perforation
  • Duodenal ulcer without hemorrhage AND without perforation but with obstruction
  • Duodenal ulcer without hemorrhage, without perforation AND without obstruction
  • Eosinophilic duodenal ulcer
  • Eosinophilic duodenitis
  • Eosinophilic enteritis of small intestine
  • Essential tremor
  • Familial duodenal ulcer associated with rapid gastric emptying
  • Familial hypergastrinemic duodenal ulcer
  • Gastroduodenal disorder
  • Giant duodenal ulcer
  • Hereditary essential tremor
  • Increased gastrin secretion
  • Lymphocytic duodenal ulcer
  • Lymphocytic duodenitis
  • Non-steroidal anti-inflammatory drug-induced enteropathy
  • Normopepsinogenemic familial duodenal ulcer
  • Parasitic duodenal ulcer
  • Peptic ulcer without hemorrhage, without perforation AND without obstruction
  • Postpyloric ulcer
  • Recurrent duodenal ulcer
  • Stress ulcer of duodenum
  • Tremor, nystagmus, duodenal ulcer syndrome
  • Ulcer of anastomosis
  • Ulcer of duodenum
  • Ulcer of duodenum caused by chemical
  • Ulcer of duodenum caused by ionizing radiation
  • Ulcer of duodenum due to infection
  • Ulcer of intestine due to immunoglobulin A vasculitis
  • Ulcer of small intestine caused by radiation

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)

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

  • Essential Tremor

    a relatively common disorder characterized by a fairly specific pattern of tremors which are most prominent in the upper extremities and neck, inducing titubations of the head. the tremor is usually mild, but when severe may be disabling. an autosomal dominant pattern of inheritance may occur in some families (i.e., familial tremor). (mov disord 1988;13(1):5-10)

  • Essential Tremor

    a movement disorder characterized by involuntary and rhythmic shaking of parts of the body, most often the hands or arms, that can be triggered or worsened by physical or environmental stressors. essential tremor may be progressive and can be inherited in an autosomal dominant manner.

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 K26.9 to ICD-9-CMHistory

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

ICD-9-CM
532.90 Duodenal 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 K26.9Overview

Is K26.9 (Duodenal ulcer) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report duodenal ulcer, 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 K26.9 group to?

When duodenal ulcer, 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 K26.9?

Under the General Equivalence Mappings, duodenal ulcer, unspecified as acute or chronic, without hemorrhage or perforation converts to ICD-9-CM 532.90 (duodenal 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.