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K26 ICD-10-CA category: Duodenal ulcer

K26 isn’t a code on its own. Choose one of the 9 codes beneath it, the one the documentation supports.

Official description

K26

Duodenal ulcer

ICD-10-CA · Canada

Codes in K26

K26 isn’t a code on its own. Open the code that matches what the note documents.

K26.0Duodenal ulcer, acute with haemorrhageK26.1Duodenal ulcer, acute with perforationK26.2Duodenal ulcer, acute with both haemorrhage and perforationK26.3Duodenal ulcer, acute without haemorrhage or perforationK26.4Duodenal ulcer, chronic or unspecified with haemorrhageK26.5Duodenal ulcer, chronic or unspecified with perforationK26.6Duodenal ulcer, chronic or unspecified with both haemorrhage and perforationK26.7Duodenal ulcer, chronic without haemorrhage or perforationK26.9Duodenal ulcer, unspecified as acute or chronic, without haemorrhage or perforation

Notes for K26

As CIHI prints them, with any note K26 takes from the headings above it.

Includes

  • Erosion (acute) of duodenumulcer (peptic):• duodenal• postpyloric

Use additional code

Add a code for this detail when the note documents it.

  • Use additional code to identify Helicobacter pylori (B98.0) if present.
  • Use additional external cause code (Chapter XX) to identify drug, if drug-induced.

Excludes

Conditions classified elsewhere.

  • Peptic ulcer NOS (K27.-)
  • Hiatus hernia (K44.-)From K20-K31 Diseases of oesophagus, stomach and duodenum
  • Certain:• conditions originating in the perinatal period (P00-P96)• infectious and parasitic diseases (A00-B99)complications of pregnancy, childbirth and the puerperium (O00-O99)congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)endocrine, nutritional and metabolic diseases (E00-E90)injury, poisoning and certain other consequences of external causes (S00-T98)neoplasms (C00-D48)symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)From Chapter 11: Diseases of the digestive system (K00-K93)

Where K26 sits

  1. 1ChapterChapter 11: Diseases of the digestive system (K00-K93)
  2. 2Block K20-K31Diseases of oesophagus, stomach and duodenum
  3. 3Category K26Duodenal ulcer

Source and release

Data release
ICD-10-CA · FY 2026–2027
Effective date
Apr 1, 2026
Publisher
CIHI

This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.

See K26 in the CIHI source

Frequently asked questions

Is K26 a valid ICD-10-CA code?

No. K26 (Duodenal ulcer) is a category heading in CIHI’s ICD-10-CA FY 2026–2027 release. It holds 9 codes; record the one the documentation supports.

Where is K26 in ICD-10-CA?

K26 sits under K20-K31 Diseases of oesophagus, stomach and duodenum, within Chapter 11: Diseases of the digestive system (K00-K93).

What coding notes apply to K26?

ICD-10-CA lists Includes, Use additional code, Excludes notes for K26, including those from the headings it sits under. They are listed on this page with where each one comes from.

Which ICD-10-CA release does this page use?

It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.

Codes beside K26

K20OesophagitisK21Gastro-oesophageal reflux diseaseK22Other diseases of oesophagusK23Disorders of oesophagus in diseases classified elsewhereK25Gastric ulcerK27Peptic ulcer, site unspecifiedK28Gastrojejunal ulcerK29Gastritis and duodenitisK30Functional dyspepsiaK31Other diseases of stomach and duodenum