8B88.2

ICD-11 MMS 2026-01

Hemifacial spasm

Description

Hemifacial spasm (HFS) is a movement disorder most commonly caused by vascular compression of the VII cranial nerve at its root exit zone from the brainstem. It manifests as involuntary contractions and twitching on ipsilateral side of the face.

Index terms

  • Hemifacial spasm
  • Clonic hemifacial spasm
  • Bell spasm
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  • facial spasm NEC
  • myoclonus facial spasm

Exclusions from above levels

  • 9C40 – Disorder of the optic nerve
  • AB72 – Disorders of acoustic nerve
  • FB56 – neuritis NOS
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  • http://id.who.int/icd/entity/114997967 – Injury of nerves or lumbar spinal cord at abdomen, lower back or pelvis level
  • http://id.who.int/icd/entity/1454363907 – Injury of nerves or spinal cord at neck level
  • NA04 – Injury of cranial nerves
  • NC14 – Injury of nerves at shoulder or upper arm level
  • NC34 – Injury of nerves at forearm level
  • NC55 – Injury of nerves at wrist or hand level
  • NC74 – Injury of nerves at hip or thigh level
  • NC94 – Injury of nerves at lower leg level
  • ND15 – Injury of nerves at ankle or foot level
  • 05 – Endocrine, nutritional or metabolic diseases
  • 18 – Complications of pregnancy, childbirth and the puerperium
  • 19 – Certain conditions originating in the perinatal period
  • 22 – Injury, poisoning or certain other consequences of external causes

Sibling codes

  • 8B88.0 – Bell palsy
  • 8B88.1 – Facial myokymia
  • 8B88.3 – Facial neuritis
  • 8B88.Y – Other specified disorders of facial nerve
  • 8B88.Z – Disorders of facial nerve, unspecified

Foundation entity

Hemifacial spasm – http://id.who.int/icd/entity/353312397

Part of: 8B88: Disorders of facial nerve › 08: Diseases of the nervous system