ICD-10-CM Code H33.123

Parasitic cyst of retina, bilateral

Version 2021 Billable Code

Valid for Submission

H33.123 is a billable code used to specify a medical diagnosis of parasitic cyst of retina, bilateral. The code is valid for the fiscal year 2021 for the submission of HIPAA-covered transactions.

ICD-10:H33.123
Short Description:Parasitic cyst of retina, bilateral
Long Description:Parasitic cyst of retina, bilateral

Diagnostic Related Groups

The ICD-10 code H33.123 is grouped in the following groups for version MS-DRG V38.0 What are Diagnostic Related Groups?
The Diagnostic Related Groups (DRGs) are a patient classification scheme which provides a means of relating the type of patients a hospital treats. The DRGs divides all possible principal diagnoses into mutually exclusive principal diagnosis areas referred to as Major Diagnostic Categories (MDC).
applicable from 10/01/2020 through 09/30/2021.

  • 121 - ACUTE MAJOR EYE INFECTIONS WITH CC/MCC
  • 122 - ACUTE MAJOR EYE INFECTIONS WITHOUT CC/MCC

Convert H33.123 to ICD-9

  • 360.13 - Parasitic endophthal NOS (Approximate Flag)

Code Classification

  • Diseases of the eye and adnexa (H00–H59)
    • Disorders of choroid and retina (H30-H36)
      • Retinal detachments and breaks (H33)

Code History

  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
    (First year ICD-10-CM implemented into the HIPAA code set)
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021

Information for Patients


Parasitic Diseases

Parasites are living things that use other living things - like your body - for food and a place to live. You can get them from contaminated food or water, a bug bite, or sexual contact. Some parasitic diseases are easily treated and some are not.

Parasites range in size from tiny, one-celled organisms called protozoa to worms that can be seen with the naked eye. Some parasitic diseases occur in the United States. Contaminated water supplies can lead to Giardia infections. Cats can transmit toxoplasmosis, which is dangerous for pregnant women. Others, like malaria, are common in other parts of the world.

If you are traveling, it's important to drink only water you know is safe. Prevention is especially important. There are no vaccines for parasitic diseases. Some medicines are available to treat parasitic infections.

  • Amebiasis (Medical Encyclopedia)
  • Amebic liver abscess (Medical Encyclopedia)
  • Ascariasis (Medical Encyclopedia)
  • Creeping eruption (Medical Encyclopedia)
  • Stool ova and parasites exam (Medical Encyclopedia)
  • Taeniasis (Medical Encyclopedia)

[Learn More]

Retinal Disorders

The retina is a layer of tissue in the back of your eye that senses light and sends images to your brain. In the center of this nerve tissue is the macula. It provides the sharp, central vision needed for reading, driving and seeing fine detail.

Retinal disorders affect this vital tissue. They can affect your vision, and some can be serious enough to cause blindness. Examples are

  • Macular degeneration - a disease that destroys your sharp, central vision
  • Diabetic eye disease
  • Retinal detachment - a medical emergency, when the retina is pulled away from the back of the eye
  • Retinoblastoma - cancer of the retina. It is most common in young children.
  • Macular pucker - scar tissue on the macula
  • Macular hole - a small break in the macula that usually happens to people over 60
  • Floaters - cobwebs or specks in your field of vision

NIH: National Eye Institute

  • Amaurosis fugax (Medical Encyclopedia)
  • Central serous choroidopathy (Medical Encyclopedia)
  • Electroretinography (Medical Encyclopedia)
  • Fluorescein angiography (Medical Encyclopedia)
  • High blood pressure and eye disease (Medical Encyclopedia)
  • Home vision tests (Medical Encyclopedia)
  • Intravitreal injection (Medical Encyclopedia)
  • Retinal artery occlusion (Medical Encyclopedia)
  • Retinal vein occlusion (Medical Encyclopedia)

[Learn More]