ICD-10 Code H18 – Other disorders of cornea (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H18 – Other disorders of cornea
What it is
H18 identifies corneal disorders that are not classified elsewhere. Use it when the documentation describes a corneal condition but does not fit a more specific ICD-10-CM code.
Clinical signs
Clinical features vary; refer to documentation. Corneal disorders may involve pain, blurred vision, redness, tearing, light sensitivity, or visible corneal changes on examination.
When to use this code
Use H18 when the provider documents a nonspecific corneal disorder, such as an unspecified degeneration, dystrophy, or structural abnormality, and no more precise code is supported. It also applies when the record confirms corneal disease but lacks detail for a specific subtype. Check documentation before assigning it.
Do not use for
Do not use H18 if the chart identifies a specific corneal diagnosis with its own code, such as keratitis, corneal ulcer, or corneal transplant complications. Do not use it for symptoms alone without a documented corneal disorder.
Coding tip
Query the provider for the exact corneal diagnosis when the record only says “corneal disorder” or “corneal abnormality.”