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Chapters ENES DE

03Diseases of the blood or blood-forming organs
Coagulation defects, purpura or other haemorrhagic or related conditions
3B63Thrombocytosis
3B63.1Acquired thrombocytosis

3B63.10 category

Secondary thrombocytosis

Also indexed as

Secondary thrombocytosis

Nearby in Acquired thrombocytosis

4B4YOther specified diseases of the immune system
4B4ZDiseases of the immune system, unspecified

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
3A00-3A9ZAnaemias or other erythrocyte disorders
3B10-3B6ZCoagulation defects, purpura or other haemorrhagic or related conditions
3B80-3B8ZDiseases of spleen
4B4YOther specified diseases of the immune system
4B4ZDiseases of the immune system, unspecified
3B50-3B51Fibrinolytic defects
3B60Non-thrombocytopenic purpura
3B61Thrombophilia
3B62Qualitative platelet defects
3B63Thrombocytosis
3B64Thrombocytopenia
3B65Thrombotic microangiopathy, not elsewhere classified
4B4YOther specified diseases of the immune system
4B4ZDiseases of the immune system, unspecified
1 more
3B63.0Congenital thrombocytosis
3B63.1Acquired thrombocytosis
4B4YOther specified diseases of the immune system
4B4ZDiseases of the immune system, unspecified
3B63.10Secondary thrombocytosis
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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