03Diseases of the blood or blood-forming organs
Anaemias or other erythrocyte disorders
Polycythaemia
3A81
category
Acquired polycythaemia
Definition Secondary polycythaemia is acquired and caused by either natural or artificial increases in the production of erythropoietin, hence an increased production of erythrocytes.
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.
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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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