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Chapters ENES DE

01Certain infectious or parasitic diseases
Mycobacterial diseases
1B20Leprosy

1B20.2 category

Leprosy reactions

2 subordinate codes

1B20.20Type I leprosy reaction
1B20.21Type II leprosy reaction

Also indexed as

Leprosy reactions

Nearby in Leprosy

1B20.0Paucibacillary leprosy
1B20.1Multibacillary leprosy
1B20.3Complications of leprosy
4B4ZDiseases of the immune system, unspecified

Previous1B20.1 — Multibacillary leprosy Next1B20.3 — Complications of leprosy

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
1A00-1A40.ZGastroenteritis or colitis of infectious origin
1A60-1A9ZPredominantly sexually transmitted infections
1B10-1B2ZMycobacterial diseases
1B40-1B5ZCertain staphylococcal or streptococcal diseases
1B70-1B7ZPyogenic bacterial infections of the skin or subcutaneous tissues
1B90-1B9ZCertain zoonotic bacterial diseases
1C10-1C4ZOther bacterial diseases
1C60-1C62.ZHuman immunodeficiency virus disease
1C80-1C8ZViral infections of the central nervous system
14 more
1B10-1B1ZTuberculosis
1B20Leprosy
1B21Infections due to non-tuberculous mycobacteria
4B4YOther specified diseases of the immune system
4B4ZDiseases of the immune system, unspecified
1B20.0Paucibacillary leprosy
1B20.1Multibacillary leprosy
1B20.2Leprosy reactions
1B20.3Complications of leprosy
4B4ZDiseases of the immune system, unspecified
1B20.20Type I leprosy reaction
1B20.21Type II leprosy reaction

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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