ICD-9 Diagnosis Code 366.18

Hypermature cataract

Diagnosis Code 366.18

ICD-9: 366.18
Short Description: Hypermature cataract
Long Description: Hypermature cataract
This is the 2014 version of the ICD-9-CM diagnosis code 366.18

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

Information for Medical Professionals

Code Edits
The following edits are applicable to this code:
Adult diagnoses (age 15 through 124) Additional informationCallout TooltipAdult diagnoses (age 15 through 124)
Adult diagnoses: Age range is 15–124 years inclusive.

Convert to ICD-10 Additional informationCallout TooltipGeneral Equivalence Map
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.

Index of Diseases and Injuries
References found for the code 366.18 in the Index of Diseases and Injuries:

    • Cataract (anterior cortical) (anterior polar) (black) (capsular) (central) (cortical) (hypermature) (immature) (incipient) (mature)� 366.9
      • morgagnian 366.18
      • senile 366.10
        • hypermature 366.18

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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