08Diseases of the nervous system Certain disorders of the nervous system 8E40Disorders of the meninges excluding infection
8E40.3
category
Arachnoiditis
Definition Arachnoiditis is a chronic inflammation of the arachnoid layer of the meninges, of which adhesive arachnoiditis is the most severe form, characterised by debilitating, intractable neurogenic back and limb pain and a range of other neurological problems.
Also indexed as
Arachnoiditis Cranial arachnoiditis Optico-chiasmatic arachnoiditis Spinal arachnoiditis arachnitis arachnoid inflammation brain arachnoiditis brain membrane inflammation cerebral membrane inflammation
Nearby in Disorders of the meninges excluding infection
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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