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Chapters ENES DE

13Diseases of the digestive system
Diseases of the stomach or the duodenum
Diseases of duodenum
DA51Duodenitis

DA51.6 category

Infectious duodenitis

3 subordinate codes

DA51.60Duodenal phlegmon
4B4YOther specified diseases of the immune system
4B4ZDiseases of the immune system, unspecified

Nearby in Duodenitis

DA51.0Helicobacter-pylori associated duodenitis
DA51.1Eosinophilic duodenitis
DA51.2Lymphocytic duodenitis
DA51.3Allergic duodenitis
DA51.4Duodenitis of unknown aetiology with specific endoscopic or pathologic features
DA51.5Duodenitis due to external causes
4B4YOther specified diseases of the immune system
4B4ZDiseases of the immune system, unspecified

PreviousDA51.5 — Duodenitis due to external causes Next4B4Y — Other specified diseases of the immune system

Browse ICD-11

01Certain infectious or parasitic diseases
02Neoplasms
03Diseases of the blood or blood-forming organs
04Diseases of the immune system
05Endocrine, nutritional or metabolic diseases
06Mental, behavioural or neurodevelopmental disorders
07Sleep-wake disorders
08Diseases of the nervous system
09Diseases of the visual system
10Diseases of the ear or mastoid process
11Diseases of the circulatory system
12Diseases of the respiratory system
13Diseases of the digestive system
14Diseases of the skin
15Diseases of the musculoskeletal system or connective tissue
16Diseases of the genitourinary system
17Conditions related to sexual health
18Pregnancy, childbirth or the puerperium
19Certain conditions originating in the perinatal period
20Developmental anomalies
21Symptoms, signs or clinical findings, not elsewhere classified
22Injury, poisoning or certain other consequences of external causes
23External causes of morbidity or mortality
24Factors influencing health status or contact with health services
25Codes for special purposes
26Supplementary Chapter Traditional Medicine Conditions
VSupplementary section for functioning assessment
XExtension Codes
DA00-DA0ZDiseases or disorders of orofacial complex
DA20-DA2ZDiseases of oesophagus
DA40-DA7ZDiseases of the stomach or the duodenum
DA90-DA9ZDiseases of small intestine
DB10-DB1ZDiseases of appendix
DB30-DB3ZDiseases of large intestine
DB50-DB7ZDiseases of anal canal
DB90-DB9ZDiseases of liver
DC10-DC1ZDiseases of gallbladder or biliary tract
10 more
DA40-DA4ZDiseases of stomach
DA50-DA5ZDiseases of duodenum
DA60-DA63.ZUlcer of stomach or duodenum
4B4ZDiseases of the immune system, unspecified
DA50Acquired anatomical alterations of the duodenum
DA51Duodenitis
DA52Vascular disorders of the duodenum
DA53Duodenal polyp
Neoplasms of the duodenum
4B4YOther specified diseases of the immune system
4B4ZDiseases of the immune system, unspecified
DA51.0Helicobacter-pylori associated duodenitis
DA51.1Eosinophilic duodenitis
DA51.2Lymphocytic duodenitis
DA51.3Allergic duodenitis
DA51.4Duodenitis of unknown aetiology with specific endoscopic or pathologic features
DA51.5Duodenitis due to external causes
DA51.6Infectious duodenitis
4B4YOther specified diseases of the immune system
4B4ZDiseases of the immune system, unspecified
DA51.60Duodenal phlegmon
4B4YOther specified diseases of the immune system
4B4ZDiseases of the immune system, unspecified

International Classification of Diseases, Eleventh Revision (ICD-11), World Health Organization (WHO) 2019/2021, https://icd.who.int/browse11. Licensed under Creative Commons Attribution-NoDerivatives 3.0 IGO (CC BY-ND 3.0 IGO).

Release 2026-01. View this entity in the official WHO ICD-11 browser.

This page reproduces WHO classification content for reference. It is not medical advice and must not be used to diagnose or treat. For coding decisions, consult the official release and your national coding guidelines.

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