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ICD-10 code lookup
Search all 11,243 diagnosis codes of the WHO classification by code or by name. No account needed.
Browse by chapter
ICD-10 sorts every diagnosis into 22 chapters, mostly by body system.
- ICertain infectious and parasitic diseasesA00–B99 · 21 blocks
- IINeoplasmsC00–D48 · 4 blocks
- IIIDiseases of the blood and blood-forming organs and certain disorders involving the immune mechanismD50–D89 · 6 blocks
- IVEndocrine, nutritional and metabolic diseasesE00–E90 · 8 blocks
- VMental and behavioural disordersF00–F99 · 11 blocks
- VIDiseases of the nervous systemG00–G99 · 11 blocks
- VIIDiseases of the eye and adnexaH00–H59 · 11 blocks
- VIIIDiseases of the ear and mastoid processH60–H95 · 4 blocks
- IXDiseases of the circulatory systemI00–I99 · 10 blocks
- XDiseases of the respiratory systemJ00–J99 · 10 blocks
- XIDiseases of the digestive systemK00–K93 · 10 blocks
- XIIDiseases of the skin and subcutaneous tissueL00–L99 · 8 blocks
- XIIIDiseases of the musculoskeletal system and connective tissueM00–M99 · 6 blocks
- XIVDiseases of the genitourinary systemN00–N99 · 11 blocks
- XVPregnancy, childbirth and the puerperiumO00–O99 · 8 blocks
- XVICertain conditions originating in the perinatal periodP00–P96 · 10 blocks
- XVIICongenital malformations, deformations and chromosomal abnormalitiesQ00–Q99 · 11 blocks
- XVIIISymptoms, signs and abnormal clinical and laboratory findings, not elsewhere classifiedR00–R99 · 13 blocks
- XIXInjury, poisoning and certain other consequences of external causesS00–T98 · 21 blocks
- XXExternal causes of morbidity and mortalityV01–Y98 · 8 blocks
- XXIFactors influencing health status and contact with health servicesZ00–Z99 · 7 blocks
- XXIICodes for special purposesU00–U85 · 2 blocks
How an ICD-10 code is built
An ICD-10 code starts with a letter and two digits. Those three characters name a category, such as J06 for acute upper respiratory infections of multiple and unspecified sites. A fourth character after the dot narrows it to a subcategory: J06.9 is an acute upper respiratory infection, unspecified.
Categories are grouped into blocks of related conditions (J00–J06, acute upper respiratory infections) and blocks into chapters (Chapter X, diseases of the respiratory system). Code to the most specific level the record supports, and read the exclusion notes: they say which similar conditions belong somewhere else.
National editions
Countries report with their own edition. Sweden uses ICD-10-SE, Germany ICD-10-GM, the United States ICD-10-CM. They share the WHO structure and often add a fifth character or more for extra detail. Each code page here shows how the national editions list the same code.
Diagnoses and procedures
ICD-10 describes what the patient has. What was done is coded separately; in Sweden with KVÅ procedure codes, which are reported alongside the diagnosis.
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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