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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.

Official description

K26

Duodenal ulcer

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

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

Codes under K26

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

K26.0Acute duodenal ulcer with hemorrhageK26.1Acute duodenal ulcer with perforationK26.2Acute duodenal ulcer with both hemorrhage and perforationK26.3Acute duodenal ulcer without hemorrhage or perforationK26.4Chronic or unspecified duodenal ulcer with hemorrhageK26.5Chronic or unspecified duodenal ulcer with perforationK26.6Chronic or unspecified duodenal ulcer with both hemorrhage and perforationK26.7Chronic duodenal ulcer without hemorrhage or perforationK26.9Duodenal ulcer, unspecified as acute or chronic, without hemorrhage or perforation

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.

Source and release

Data release
U.S. ICD-10-CM · FY 2027
Effective date
Oct 1, 2026

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

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.