ICD-10-CM Code K26.9

Duodenal ulcer, unspecified as acute or chronic, without hemorrhage or perforation

Version 2020 Billable Code

Valid for Submission

K26.9 is a billable code used to specify a medical diagnosis of duodenal ulcer, unspecified as acute or chronic, without hemorrhage or perforation. The code is valid for the year 2020 for the submission of HIPAA-covered transactions. The ICD-10-CM code K26.9 might also be used to specify conditions or terms like childhood duodenal ulcer, chronic duodenitis, chronic duodenitis, chronic inflammatory small bowel disease, chronic inflammatory small bowel disease, combined gastric and duodenal ulcer, etc

Short Description:Duodenal ulcer, unsp as acute or chronic, w/o hemor or perf
Long Description:Duodenal ulcer, unspecified as acute or chronic, without hemorrhage or perforation

Index to Diseases and Injuries

The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for the code K26.9 are found in the index:


The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Childhood duodenal ulcer
  • Chronic duodenitis
  • Chronic duodenitis
  • Chronic inflammatory small bowel disease
  • Chronic inflammatory small bowel disease
  • Combined gastric AND duodenal ulcer
  • Duodenal erosion
  • 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 ionizing radiation
  • Duodenal ulcer caused by non-steroidal anti-inflammatory drug
  • Duodenal ulcer caused by virus
  • Duodenal ulcer due to Zollinger-Ellison syndrome
  • Duodenal ulcer induced by anti-platelet agent
  • 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
  • Familial duodenal ulcer associated with rapid gastric emptying
  • Familial hypergastrinemic duodenal ulcer
  • Gastroduodenal disorder
  • Gastroduodenal disorder
  • Giant duodenal ulcer
  • Helicobacter pylori gastrointestinal tract infection
  • Hypergastrinemia
  • Lymphocytic duodenal ulcer
  • Lymphocytic duodenitis
  • Non-steroidal anti-inflammatory drug-induced enteropathy
  • Normopepsinogenemic familial duodenal ulcer
  • Postpyloric ulcer
  • Recurrent duodenal ulcer
  • Stress ulcer of duodenum
  • Ulcer of anastomosis
  • Ulcer of duodenum
  • Ulcer of duodenum caused by chemical
  • Ulcer of duodenum due to infection
  • Ulcer of small intestine caused by radiation

Diagnostic Related Groups

The ICD-10 code K26.9 is grouped in the following groups for version MS-DRG V37.0 What are Diagnostic Related Groups?
The Diagnostic Related Groups (DRGs) are a patient classification scheme which provides a means of relating the type of patients a hospital treats. The DRGs divides all possible principal diagnoses into mutually exclusive principal diagnosis areas referred to as Major Diagnostic Categories (MDC).
applicable from 10/01/2019 through 09/30/2020.


Convert K26.9 to ICD-9

  • 532.90 - Duodenal ulcer NOS (Approximate Flag)

Code Classification

  • Diseases of the digestive system (K00–K93)
    • Diseases of esophagus, stomach and duodenum (K20-K31)
      • Duodenal ulcer (K26)

Code History

  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
    (First year ICD-10-CM implemented into the HIPAA code set)
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020

Information for Patients

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

  • Starts between meals or during the night
  • Briefly stops if you eat or take antacids
  • Lasts for minutes to hours
  • Comes and goes for several days or weeks

Peptic ulcers happen when the acids that help you digest food damage the walls of the stomach or duodenum. The most common cause is infection with a bacterium called Helicobacter pylori. Another cause is the long-term use of nonsteroidal anti-inflammatory medicines (NSAIDs) such as aspirin and ibuprofen. Stress and spicy foods do not cause ulcers, but can make them worse.

To see if you have an H. pylori infection, your doctor will test your blood, breath, or stool. Your doctor also may look inside your stomach and duodenum by doing an endoscopy or x-ray.

Peptic ulcers will get worse if not treated. Treatment may include medicines to reduce stomach acids or antibiotics to kill H. pylori. Antacids and milk can't heal peptic ulcers. Not smoking and avoiding alcohol can help. You may need surgery if your ulcers don't heal.

NIH: National Institute of Diabetes and Digestive and Kidney Diseases

[Learn More]