2027 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
- Billable — Valid for Submission
- Not Chronic
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 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 380 through 384. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Gastroduodenal ulcer.
Code Identity
Code Classification
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 ionizing radiation
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to K26.9: its own notes plus those printed at K26, block K20-K31, and Chapter 11. A note printed at a category, block or chapter applies to every code under it.
Includes
Further defines, or gives examples of, the content of the category.
- erosion (acute) of duodenum
- duodenum ulcer (peptic)
- postpyloric ulcer (peptic)
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- hiatus hernia (K44.-)
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Use Additional Code
Add a second code, after this one, to fully describe the condition.
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name K26.9, its category, or a range that includes it.
Excludes1 3
These codes carry an Excludes1 note naming K26.9: they are not reported together with it, unless the two conditions are unrelated.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Duodenal Ulcer
a peptic ulcer located in the duodenum.
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.
Code HistoryHistory
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, 2026 through September 30, 2027.
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 381, 380, 383, 384, 382, with relative weights from 0.7283 to 1.9243 depending on complications. Higher weights mean higher Medicare reimbursement.
Can K26.9 be reported with a code from K27?
Not as a rule. The Excludes1 note at K26, which applies to K26.9, lists "peptic ulcer NOS (K27.-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
Does K26.9 need an additional code?
When the condition applies, yes. The Use Additional Code note at K26, which applies to K26.9, reads: code to identify: alcohol abuse and dependence (F10.-). The additional code is reported after K26.9.
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.
