U.S. ICD-10-CM · FY 2027

K26 ICD-10-CM Code: Duodenal ulcer

A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.

Code definition

Official description

K26

Duodenal ulcer

ICD-10-CM diagnosis code · United States clinical modification

Classification

Where K26 sits

  1. 1

    Chapter 11

    Diseases of the digestive system (K00-K95)

  2. 2

    Section

    Diseases of esophagus, stomach and duodenum (K20-K31)

  3. 3

    Category K26

    Duodenal ulcer

  4. 4

    Code K26

    Duodenal ulcer

More specific choices

Codes under K26

K26 is a non-billable category. Choose the child code that best matches the documented diagnosis.

K26.0

Acute duodenal ulcer with hemorrhage

K26.1

Acute duodenal ulcer with perforation

K26.2

Acute duodenal ulcer with both hemorrhage and perforation

K26.3

Acute duodenal ulcer without hemorrhage or perforation

K26.4

Chronic or unspecified duodenal ulcer with hemorrhage

K26.5

Chronic or unspecified duodenal ulcer with perforation

K26.6

Chronic or unspecified duodenal ulcer with both hemorrhage and perforation

K26.7

Chronic duodenal ulcer without hemorrhage or perforation

K26.9

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

Documentation details

Notes for this code

Inclusion terms

No inclusion terms are listed for K26.

Code first

No “code first” instruction is listed for K26.

Use additional code

  • code to identify:
  • alcohol abuse and dependence (F10.-)

Excludes1

Conditions that should not be reported together with this code.

  • peptic ulcer NOS (K27.-)

Excludes2

Conditions not included here that may be reported separately when present.

No Excludes2 note is listed for K26.

Transparency

Source and release

Data release

U.S. ICD-10-CM · FY 2027

Effective date

Oct 1, 2026

Publisher

Vero Scribe Inc.

This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.

Review the CDC/NCHS ICD-10-CM source

Code-specific guidance

Frequently asked questions

What does ICD-10-CM code K26 mean?

K26 is the FY 2027 U.S. ICD-10-CM code for “Duodenal ulcer.”

Is K26 a billable or specific ICD-10-CM code?

No. K26 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.

Where is K26 located in ICD-10-CM?

K26 is listed in Chapter 11, Diseases of the digestive system (K00-K95), within Diseases of esophagus, stomach and duodenum (K20-K31) (K20–K31), under category K26, Duodenal ulcer.

What coding notes are listed for K26?

No inclusion terms are listed for K26 in this reference record. No code-first instruction is listed. Additional-code instructions: code to identify:; alcohol abuse and dependence (F10.-). Excludes1 notes: peptic ulcer NOS (K27.-). No Excludes2 note is listed.

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