ICD-10-CM Code H18.20

Unspecified corneal edema

Version 2021 Billable Code

Valid for Submission

H18.20 is a billable code used to specify a medical diagnosis of unspecified corneal edema. The code is valid for the fiscal year 2021 for the submission of HIPAA-covered transactions. The ICD-10-CM code H18.20 might also be used to specify conditions or terms like bullous corneal epithelial edema, corneal edema, corneal epithelial edema, corneal stromal edema, edema of cornea of bilateral eyes, edema of cornea of left eye, etc

Short Description:Unspecified corneal edema
Long Description:Unspecified corneal edema


The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Bullous corneal epithelial edema
  • Corneal edema
  • Corneal epithelial edema
  • Corneal stromal edema
  • Edema of cornea of bilateral eyes
  • Edema of cornea of left eye
  • Edema of cornea of right eye
  • Fine corneal edema
  • Infiltrate of cornea
  • Infiltrate of cornea of bilateral eyes
  • Infiltrate of cornea of left eye
  • Infiltrate of cornea of right eye
  • Microcystic edema of cornea of left eye
  • Microcystic edema of cornea of right eye
  • Pseudophakic corneal edema

Clinical Information

  • CORNEAL EDEMA-. an excessive amount of fluid in the cornea due to damage of the epithelium or endothelium causing decreased visual acuity.

Diagnostic Related Groups

The ICD-10 code H18.20 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.


Convert H18.20 to ICD-9

Code Classification

  • Diseases of the eye and adnexa (H00–H59)
    • Disorders of sclera, cornea, iris and ciliary body (H15-H22)
      • Other disorders of cornea (H18)

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

Corneal Disorders

Your cornea is the outermost layer of your eye. It is clear and shaped like a dome. The cornea helps to shield the rest of the eye from germs, dust, and other harmful matter. It also helps your eye to focus. If you wear contact lenses, they float on top of your corneas.

Problems with the cornea include

  • Refractive errors
  • Allergies
  • Infections
  • Injuries
  • Dystrophies - conditions in which parts of the cornea lose clarity due to a buildup of cloudy material

Treatments of corneal disorders include medicines, corneal transplantation, and corneal laser surgery.

NIH: National Eye Institute

  • Cloudy cornea (Medical Encyclopedia)
  • Corneal injury (Medical Encyclopedia)
  • Corneal transplant (Medical Encyclopedia)
  • Corneal ulcers and infections (Medical Encyclopedia)
  • Fuchs dystrophy (Medical Encyclopedia)
  • Keratoconus (Medical Encyclopedia)

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