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Chapters ENES DE

01Certain infectious or parasitic diseases
Other bacterial diseases

1C1J category

Relapsing fever

3 subordinate codes

1C1J.0Tick-borne relapsing fever
1C1J.1Louse-borne relapsing fever
4B4ZDiseases of the immune system, unspecified

Nearby in Other bacterial diseases

1C10Actinomycosis
1C11Bartonellosis
1C12Whooping cough
1C13Tetanus
1C14Obstetrical tetanus
1C15Tetanus neonatorum
1C16Gas gangrene
1C17Diphtheria

Previous1C1H — Necrotising ulcerative gingivitis Next1C20-1C2Z — Other diseases due to chlamydiae

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
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
1D00-1D0ZNon-viral or unspecified infections of the central nervous system
1D20-1D2ZDengue
14 more
1C1BNocardiosis
1C1CMeningococcal disease
1C1DYaws
1C1EPinta
1C1FEndemic non-venereal syphilis
1C1GLyme borreliosis
1C1HNecrotising ulcerative gingivitis
1C1JRelapsing fever
1C20-1C2ZOther diseases due to chlamydiae
1C30-1C3ZRickettsioses
1C40Campylobacteriosis
1C41Bacterial infection of unspecified site
1C42Melioidosis
1C43Actinomycetoma
1C44Non-pyogenic bacterial infections of the skin
14 more
1C1J.0Tick-borne relapsing fever
1C1J.1Louse-borne relapsing fever
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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