9D00.2

ICD-11 MMS 2026-01

Astigmatism

Description

Unequal curvature of the refractive surfaces of the eye. Thus a point source of light cannot be brought to a point focus on the retina but is spread over a more or less diffuse area. This results from the radius of curvature in one plane being longer or shorter than the radius at right angles to it.

Index terms

  • Astigmatism
  • Irregular astigmatism
  • Regular astigmatism

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

  • 9D00.0 – Myopia
  • 9D00.1 – Hypermetropia
  • 9D00.3 – Presbyopia
  • 9D00.4 – Anisometropia
  • 9D00.5 – Aniseikonia
  • 9D00.6 – Transient refractive change
  • 9D00.Y – Other specified disorders of refraction
  • 9D00.Z – Disorders of refraction, unspecified

Foundation entity

Astigmatism – http://id.who.int/icd/entity/402558626

Allowed postcoordination axes

Part of: 9D00: Disorders of refraction › 09: Diseases of the visual system