8E40.3

ICD-11 MMS 2026-01

Arachnoiditis

Description

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.

Index terms

  • Arachnoiditis
  • arachnitis
  • arachnoid inflammation
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  • Spinal arachnoiditis
  • Optico-chiasmatic arachnoiditis
  • Cranial arachnoiditis
  • brain arachnoiditis
  • brain membrane inflammation
  • cerebral membrane inflammation

Exclusions from above levels

  • 05 – Endocrine, nutritional or metabolic diseases
  • 18 – Complications of pregnancy, childbirth and the puerperium
  • 19 – Certain conditions originating in the perinatal period
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  • 22 – Injury, poisoning or certain other consequences of external causes

Sibling codes

  • 8E40.0 – Neoplastic meningitis
  • 8E40.1 – Chemical meningitis
  • 8E40.2 – Inflammatory meningitis
  • 8E40.Y – Other specified disorders of the meninges excluding infection
  • 8E40.Z – Disorders of the meninges excluding infection, unspecified

Foundation entity

Arachnoiditis – http://id.who.int/icd/entity/414817254

Part of: 8E40: Disorders of the meninges excluding infection › 08: Diseases of the nervous system