ICD-9 Diagnosis Code 366.03

Cortical cataract

Diagnosis Code 366.03

ICD-9: 366.03
Short Description: Cortical cataract
Long Description: Cortical, lamellar, or zonular cataract
This is the 2014 version of the ICD-9-CM diagnosis code 366.03

Code Classification
  • Diseases of the sense organs
    • Disorders of the eye and adnexa (360-379)
      • 366 Cataract

Information for Medical Professionals

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The ICD-10 and ICD-9 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.

  • Zonular nonsenile cataract

Index of Diseases and Injuries
References found for the code 366.03 in the Index of Diseases and Injuries:

    • Cataract (anterior cortical) (anterior polar) (black) (capsular) (central) (cortical) (hypermature) (immature) (incipient) (mature)� 366.9
      • juvenile 366.00
        • cortical 366.03
        • lamellar 366.03
        • zonular 366.03
      • lamellar 743.32
        • infantile juvenile, or presenile 366.03
      • zonular (perinuclear) 743.32
        • infantile, juvenile, or presenile 366.03

Information for Patients


A cataract is a clouding of the lens in your eye. It affects your vision. Cataracts are very common in older people. By age 80, more than half of all Americans either have a cataract or have had cataract surgery.

A cataract can occur in either or both eyes. It cannot spread from one eye to the other. Common symptoms are

  • Blurry vision
  • Colors that seem faded
  • Glare - headlights, lamps or sunlight may seem too bright. You may also see a halo around lights.
  • Not being able to see well at night
  • Double vision
  • Frequent prescription changes in your eye wear

Cataracts usually develop slowly. New glasses, brighter lighting, anti-glare sunglasses or magnifying lenses can help at first. Surgery is also an option. It involves removing the cloudy lens and replacing it with an artificial lens. Wearing sunglasses and a hat with a brim to block ultraviolet sunlight may help to delay cataracts.

NIH: National Eye Institute

  • Cataract
  • Cataract removal
  • Slit-lamp exam
  • Standard ophthalmic exam

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