16Diseases of the genitourinary system Diseases of the urinary system Certain specified diseases of urinary system GC00Cystitis
GC00.0
category
Trigonitis
Definition A condition of the bladder that is frequently idiopathic. This condition is characterised by inflammation of the nonkeratinizing squamous metaplasia in the trigone region of the bladder.
Also indexed as
Trigonitis Urethrotrigonitis bladder trigonitis pseudomembranous trigonitis
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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