ICD-10 Code H18.79 – Other corneal deformities (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H18.79 – Other corneal deformities
What it is
This code identifies corneal shape abnormalities that do not fit a more specific corneal disorder category. Use it when the record documents an atypical deformity of the cornea and no better-defined diagnosis is available.
Clinical signs
Clinical features vary; refer to documentation. Findings may include an irregular corneal contour, distorted corneal surface, or visual disturbance related to corneal shape changes.
When to use this code
Use H18.79 when the provider documents an “other” corneal deformity and the chart does not support a more specific corneal diagnosis. It is appropriate for cases where the deformity is described but not classified elsewhere. Check documentation if the note suggests keratoconus, corneal ectasia, scarring, or another defined condition.
Do not use for
Do not use this code when a more specific corneal disorder is documented or confirmed. If the record only mentions blurred vision without a corneal deformity diagnosis, code the symptom instead.
Coding tip
Query the provider when the corneal abnormality is vague, because specificity often changes the code choice.