9D42.22

ICD-11 MMS 2026-01

Nasal step

Description

A nasal step is a discontinuity of the nasal field limit at the horizontal meridian. It is typical for glaucoma.

Index terms

  • Nasal step

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

  • 9D42.20 – Enlarged blind spot
  • 9D42.21 – Arcuate scotoma
  • 9D42.23 – Ring scotoma
  • 9D42.24 – Isolated peripheral scotoma
  • 9D42.2Y – Other specified peripheral field deficit
  • 9D42.2Z – Peripheral field deficit, unspecified

Foundation entity

Nasal step – http://id.who.int/icd/entity/774024795

Part of: 9D42.2: Peripheral field deficit › 9D42: Patterns of visual field impairment › 09: Diseases of the visual system