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  6. 2026 ICD-10-CM Code H18

2026 ICD-10-CM Diagnosis Code H18

Other disorders of cornea

ICD-10-CM Code:
H18
ICD-10 Code for:
Other disorders of cornea
Is Billable?
Not Valid for Submission
Code Navigator:

H18 is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity from the list below for a diagnosis of other disorders of cornea. The code is not specific and is NOT valid for the year 2026 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 Other disorders of cornea

Non-specific codes like H18 require more digits to indicate the appropriate level of specificity. Consider using any of the following billable codes with a higher level of specificity when coding for other disorders of cornea:

  • H18.0 for Corneal pigmentations and deposits

  • H18.00 for Unspecified corneal deposit

  • H18.01 for Anterior corneal pigmentations

  • H18.02 for Argentous corneal deposits

  • H18.03 for Corneal deposits in metabolic disorders

  • H18.04 for Kayser-Fleischer ring

  • H18.05 for Posterior corneal pigmentations

  • H18.06 for Stromal corneal pigmentations

  • H18.1 for Bullous keratopathy

  • Use H18.10 for Bullous keratopathy, unspecified eye

  • Use H18.11 for Bullous keratopathy, right eye

  • Use H18.12 for Bullous keratopathy, left eye

  • Use H18.13 for Bullous keratopathy, bilateral

  • H18.2 for Other and unspecified corneal edema

  • Use H18.20 for Unspecified corneal edema

  • H18.21 for Corneal edema secondary to contact lens

  • H18.22 for Idiopathic corneal edema

  • H18.23 for Secondary corneal edema

  • H18.3 for Changes of corneal membranes

  • Use H18.30 for Unspecified corneal membrane change

  • H18.31 for Folds and rupture in Bowman's membrane

  • H18.32 for Folds in Descemet's membrane

  • H18.33 for Rupture in Descemet's membrane

  • H18.4 for Corneal degeneration

  • Use H18.40 for Unspecified corneal degeneration

  • H18.41 for Arcus senilis

  • H18.42 for Band keratopathy

  • Use H18.43 for Other calcerous corneal degeneration

  • H18.44 for Keratomalacia

  • H18.45 for Nodular corneal degeneration

  • H18.46 for Peripheral corneal degeneration

  • Use H18.49 for Other corneal degeneration

  • H18.5 for Hereditary corneal dystrophies

  • H18.50 for Unspecified hereditary corneal dystrophies

  • H18.51 for Endothelial corneal dystrophy

  • H18.52 for Epithelial (juvenile) corneal dystrophy

  • H18.53 for Granular corneal dystrophy

  • H18.54 for Lattice corneal dystrophy

  • H18.55 for Macular corneal dystrophy

  • H18.59 for Other hereditary corneal dystrophies

  • H18.6 for Keratoconus

  • H18.60 for Keratoconus, unspecified

  • H18.61 for Keratoconus, stable

  • H18.62 for Keratoconus, unstable

  • H18.7 for Other and unspecified corneal deformities

  • Use H18.70 for Unspecified corneal deformity

  • H18.71 for Corneal ectasia

  • H18.72 for Corneal staphyloma

  • H18.73 for Descemetocele

  • H18.79 for Other corneal deformities

  • H18.8 for Other specified disorders of cornea

  • H18.81 for Anesthesia and hypoesthesia of cornea

  • H18.82 for Corneal disorder due to contact lens

  • H18.83 for Recurrent erosion of cornea

  • H18.89 for Other specified disorders of cornea

  • Use H18.9 for Unspecified disorder of cornea

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

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 2026 - No Change, effective from 10/1/2025 through 9/30/2026
  • FY 2025 - No Change, effective from 10/1/2024 through 9/30/2025
  • 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.