2026 ICD-10-CM Diagnosis Code H18Other disorders of cornea

ICD-10-CM Codes›H00–H59›H15-H22›H18

ICD-10-CM H18
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H18 is a non-billable ICD-10-CM category code for other disorders of cornea, so it cannot be submitted on claims. Use a more specific code from this category instead, such as H18.001, H18.002, H18.003, and H18.009.

Code Identity

ICD-10-CM Code
H18
Billable Status
No — Non-Billable Category
Code Describes
Other disorders of cornea
Chapter
H15-H22
Disorders of sclera, cornea, iris and ciliary body

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH15-H22Disorders of sclera, cornea, iris and ciliary body
CategoryH18Other disorders of cornea
This CodeH18Other disorders of cornea

Specific Coding for Other disorders of corneaOverview

Non-specific codes like H18 require more characters. Use one of these billable codes instead:

  • 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

Patient EducationClinical

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.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About H18Overview

Is H18 (Other disorders of cornea) a billable code?

No. This is a category header that groups the codes for other disorders of cornea, and headers cannot be submitted on claims. Claims for other disorders of cornea need a more specific code from this category, such as H18.001, H18.002, and H18.003.