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ICD-10 diagnosis code

K26 Duodenal ulcer

This page in Swedish

K26 is the ICD-10 code for Duodenal ulcer. It is a three-character category. WHO defines its fourth-character subdivisions once for the whole group of categories; the national editions below list them in full. It belongs to the block K20–K31 (Diseases of oesophagus, stomach and duodenum) in Chapter XI, Diseases of the digestive system.

Code type
Category (3 characters)
Chapter
XI · K00–K93
Classification
WHO ICD-10, 2019 version

What K26 includes

Conditions and terms that are coded here.

  • erosion (acute) of duodenum
  • ulcer (peptic):
    • duodenal
    • postpyloric

What K26 excludes

Conditions that look similar but belong under another code.

Coding notes

  • Use additional external cause code (Chapter XX), if desired, to identify drug, if drug-induced.

K26 in national editions

Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.

SwedenICD-10-SE

K26Sår i tolvfingertarmen

  • K26.0Sår i tolvfingertarmen - akut med blödning
  • K26.1Sår i tolvfingertarmen - akut med perforation
  • K26.2Sår i tolvfingertarmen - akut med både blödning och perforation
  • K26.3Sår i tolvfingertarmen - akut utan blödning eller perforation
  • K26.4Sår i tolvfingertarmen - kroniskt eller ospecificerat med blödning
  • K26.5Sår i tolvfingertarmen - kroniskt eller ospecificerat med perforation
  • K26.6Sår i tolvfingertarmen - kroniskt eller ospecificerat med både blödning och perforation
  • K26.7Sår i tolvfingertarmen - kroniskt utan blödning eller perforation
  • and 1 more national subcodes
NorwayICD-10-NO

Listed through more specific codes:

  • K26.0Akutt sår med blødning i tolvfingertarm
  • K26.1Akutt sår med perforasjon i tolvfingertarm
  • K26.2Akutt sår med blødning og perforasjon i tolvfingertarm
  • K26.3Akutt sår uten blødning eller perforasjon i tolvfingertarm
  • K26.4Kronisk eller uspesifisert sår med blødning i tolvfingertarm
  • K26.5Kronisk eller uspesifisert sår med perforasjon i tolvfingertarm
  • K26.6Kronisk eller uspesifisert sår med blødning og perforasjon i tolvfingertarm
  • K26.7Kronisk eller uspesifisert sår uten blødning eller perforasjon i tolvfingertarm
  • and 1 more national subcodes
DenmarkICD-10-DK

DK26Sår på tolvfingertarmen

  • DK260Akut duodenalulcus med blødning
  • DK261Akut duodenalulcus med perforation
  • DK262Akut duodenalulcus med blødning og perforation
  • DK263Akut duodenalulcus uden blødning eller perforation
  • DK264Kronisk eller ikke specificeret duodenalulcus med blødning
  • DK265Kronisk eller ikke specificeret duodenalulcus med perforation
  • DK266Kronisk eller ikke specificeret duodenalulcus med blødning og perforation
  • DK267Kronisk duodenalulcus uden blødning eller perforation
  • and 1 more national subcodes
FinlandICD-10-FI

K26Pohjukaissuolen haava

GermanyICD-10-GM

K26Ulcus duodeni

FranceICD-10-FR

K26Ulcère du duodénum

NetherlandsICD-10-NL

K26ulcus duodeni

United StatesICD-10-CM

Listed through more specific codes:

  • K26.0Acute duodenal ulcer with hemorrhage
  • K26.1Acute duodenal ulcer with perforation
  • K26.2Acute duodenal ulcer with both hemorrhage and perforation
  • K26.3Acute duodenal ulcer without hemorrhage or perforation
  • K26.4Chronic or unspecified duodenal ulcer with hemorrhage
  • K26.5Chronic or unspecified duodenal ulcer with perforation
  • K26.6Chronic or unspecified duodenal ulcer with both hemorrhage and perforation
  • K26.7Chronic duodenal ulcer without hemorrhage or perforation
  • and 1 more national subcodes

Based on the World Health Organization’s International Statistical Classification of Diseases and Related Health Problems, 10th revision (ICD-10), 2019 version, and the national editions published by each country’s health authority. This page is a reference, not coding advice; follow your national coding rules when you report.

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