ICD-10-CM Code H18.4

Corneal degeneration

Version 2021 Non-Billable Code

Not Valid for Submission

H18.4 is a "header" nonspecific and non-billable code code, consider using a code with a higher level of specificity for a diagnosis of corneal degeneration. The code is NOT valid for the year 2021 for the submission of HIPAA-covered transactions.

ICD-10:H18.4
Short Description:Corneal degeneration
Long Description:Corneal degeneration

Consider the following ICD-10 codes with a higher level of specificity:

  • H18.40 - Unspecified corneal degeneration
  • H18.41 - Arcus senilis
  • H18.411 - Arcus senilis, right eye
  • H18.412 - Arcus senilis, left eye
  • H18.413 - Arcus senilis, bilateral
  • H18.419 - Arcus senilis, unspecified eye
  • H18.42 - Band keratopathy
  • H18.421 - Band keratopathy, right eye
  • H18.422 - Band keratopathy, left eye
  • H18.423 - Band keratopathy, bilateral
  • H18.429 - Band keratopathy, unspecified eye
  • H18.43 - Other calcerous corneal degeneration
  • H18.44 - Keratomalacia
  • H18.441 - Keratomalacia, right eye
  • H18.442 - Keratomalacia, left eye
  • H18.443 - Keratomalacia, bilateral
  • H18.449 - Keratomalacia, unspecified eye
  • H18.45 - Nodular corneal degeneration
  • H18.451 - Nodular corneal degeneration, right eye
  • H18.452 - Nodular corneal degeneration, left eye
  • H18.453 - Nodular corneal degeneration, bilateral
  • H18.459 - Nodular corneal degeneration, unspecified eye
  • H18.46 - Peripheral corneal degeneration
  • H18.461 - Peripheral corneal degeneration, right eye
  • H18.462 - Peripheral corneal degeneration, left eye
  • H18.463 - Peripheral corneal degeneration, bilateral
  • H18.469 - Peripheral corneal degeneration, unspecified eye
  • H18.49 - Other corneal degeneration

Tabular List of Diseases and Injuries

The Tabular List of Diseases and Injuries is a list of ICD-10 codes, organized "head to toe" into chapters and sections with guidance for inclusions, exclusions, descriptions and more. The following references are applicable to the code H18.4:

Type 1 Excludes

Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • Mooren's ulcer H16.0
  • recurrent erosion of cornea H18.83

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)

[Learn More]