9C80.5

ICD-11 MMS 2026-01

Mechanical strabismus

Description

An abnormal binocular alignment caused by abnormalities of ocular movement in one or both eyes caused by damage to the extraocular muscles and/or other orbital structures. Mechanical strabismus is characterised by limitation of movements in one or more directions and variable strabismus.

Index terms

  • Mechanical strabismus
  • acquired deformity of ocular muscle
  • Brown's sheath syndrome
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  • Brown syndrome
  • Brown tendon sheath syndrome
  • superior oblique tendon sheath syndrome
  • Mechanical strabismus from orbital pulley disorder
  • Mechanical strabismus from local anaesthetic myotoxicity
  • Mechanical strabismus due to adhesions
  • Strabismus due to adhesions
  • adhesion of ocular muscle
  • fibrosis of eye muscle
  • Mechanical strabismus due to thyroid eye disease
  • Frozen eyeball syndrome
  • Traumatic limitation of duction of eye muscle

Inclusions

  • Brown's sheath syndrome

Exclusions from above levels

  • 01 – Certain infectious or parasitic diseases
  • 05 – Endocrine, nutritional or metabolic diseases
  • 18 – Complications of pregnancy, childbirth and the puerperium
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  • 19 – Certain conditions originating in the perinatal period
  • 22 – Injury, poisoning or certain other consequences of external causes
  • 8A21.0 – Posterior cortical atrophy

Sibling codes

  • 9C80.0 – Esotropia
  • 9C80.1 – Exotropia
  • 9C80.2 – Vertical or torsional strabismus
  • 9C80.3 – Intermittent strabismus
  • 9C80.4 – Heterophoria
  • 9C80.Y – Other specified non paralytic strabismus
  • 9C80.Z – Non paralytic strabismus, unspecified

Foundation entity

Mechanical strabismus – http://id.who.int/icd/entity/230827382

Allowed postcoordination axes

Part of: 9C80: Non paralytic strabismus › 09: Diseases of the visual system