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  6. 2024 ICD-10-CM Code H18.62
Version 2024
Non-Billable Code

2024 ICD-10-CM Diagnosis Code H18.62

Keratoconus, unstable

ICD-10-CM Code:
H18.62
ICD-10 Code for:
Keratoconus, unstable
Is Billable?
Not Valid for Submission
Code Navigator:

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)

H18.62 is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of keratoconus, unstable. The code is not specific and is NOT valid for the year 2024 for the submission of HIPAA-covered transactions. Category or Header define the heading of a category of codes that may be further subdivided by the use of 4th, 5th, 6th or 7th characters.

Specific Coding Applicable to Keratoconus, unstable

Non-specific codes like H18.62 require more digits to indicate the appropriate level of specificity. Consider using any of the following ICD-10-CM codes with a higher level of specificity when coding for keratoconus, unstable:

  • Use H18.621 for Keratoconus, unstable, right eye - BILLABLE CODE

  • Use H18.622 for Keratoconus, unstable, left eye - BILLABLE CODE

  • Use H18.623 for Keratoconus, unstable, bilateral - BILLABLE CODE

  • Use H18.629 for Keratoconus, unstable, unspecified eye - BILLABLE CODE

Clinical Information

  • Keratoconus

    a noninflammatory, usually bilateral protrusion and thinning of the cornea, the apex being displaced downward and nasally. it occurs most commonly in females at about puberty. two closely related noninflammatory corneal ectasias are pellucid marginal degeneration and keratoglobus.

  • Cornea

    the transparent anterior portion of the fibrous coat of the eye consisting of five layers: stratified squamous corneal epithelium; bowman membrane; corneal stroma; descemet membrane; and mesenchymal corneal endothelium. it serves as the first refracting medium of the eye. it is structurally continuous with the sclera, avascular, receiving its nourishment by permeation through spaces between the lamellae, and is innervated by the ophthalmic division of the trigeminal nerve via the ciliary nerves and those of the surrounding conjunctiva which together form plexuses. (cline et al., dictionary of visual science, 4th ed)

  • Keratoconus

    a degenerative, structural disorder of the eye, characterized by a cone-shaped protrusion of the cornea. it may lead to visual disturbances.

Tabular List of Diseases and Injuries

The following annotation back-references are applicable to this diagnosis code. The Tabular List of Diseases and Injuries is a list of ICD-10-CM codes, organized "head to toe" into chapters and sections with coding notes and guidance for inclusions, exclusions, descriptions and more.


Inclusion Terms

Inclusion Terms
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
  • Acute hydrops

Index to Diseases and Injuries References

The following annotation back-references for this diagnosis code are found in the injuries and diseases index. The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10-CM code(s).

Patient Education


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


[Learn More in MedlinePlus]

Code History

  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.