8E41

ICD-11 MMS 2026-01

Pachymeningitis

Description

Inflammation of the pachymeninges resulting in localised or diffuse thickening of the dura mater which can be caused by chronic infection, inflammatory and immune-mediated disorders and malignancies. The cranial and/or the spinal dura may be affected. Neurological features include headache, visual disturbance, cranial nerve palsies, ataxia and with spinal involvement, limb weakness, sensory impairment and sphincter disturbances . Diagnosis may be aided by neuroimaging and spinal fluid analysis.

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

Child codes

  • 8E41.0 – Pachymeningitis due to infection
  • 8E41.1 – Idiopathic hypertrophic pachymeningitis
  • 8E41.Y – Other specified pachymeningitis
  • 8E41.Z – Pachymeningitis, unspecified

Sibling codes

  • 8E40 – Disorders of the meninges excluding infection
  • 8E42 – Superficial siderosis of the nervous system
  • 8E43 – Pain disorders
  • 8E44 – Post anoxic brain damage
  • 8E45 – Locked-in syndrome
  • 8E46 – Reye syndrome
  • 8E47 – Encephalopathy, not elsewhere classified
  • 8E48 – Encephalitis, not elsewhere classified
  • 8E49 – Postviral fatigue syndrome
  • 8E4A – Paraneoplastic or autoimmune disorders of the nervous system

Foundation entity

Pachymeningitis – http://id.who.int/icd/entity/592562777

Part of: 08: Diseases of the nervous system