19Certain conditions originating in the perinatal period Infections of the fetus or newborn KA65Neonatal infections of certain specified sites
KA65.3
category
Neonatal infectious mastitis
Definition Pyogenic infection of the breasts of neonates, whose breast tissue may be enlarged as a result of transplacentally transmitted maternal oestrogens. It is twice as common in female as in male infants; most cases are unilateral. It is most commonly caused by Staphylococcus aureus.
Also indexed as
Neonatal infectious mastitis infective mastitis of newborn neonatal breast abscess newborn breast abscess
Nearby in Neonatal infections of certain specified sites
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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