ICD-10 Code H18.711 – Corneal ectasia, right eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H18.711 – Corneal ectasia, right eye
What it is
H18.711 identifies corneal ectasia limited to the right eye. It describes a thinning and bulging of the cornea that causes the corneal surface to become irregular.
Clinical signs
Typical findings include progressive corneal steepening, irregular astigmatism, and reduced visual quality. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents corneal ectasia in the right eye, such as after refractive surgery or with another specified corneal ectatic disorder. It is appropriate when the record clearly states the right eye is affected. If laterality is not documented, check documentation before coding.
Do not use for
Do not use this code for unspecified corneal ectasia or when the left eye or both eyes are documented instead. Do not assign it if the chart only mentions corneal thinning without ectasia.
Coding tip
Verify laterality in the ophthalmology note and imaging report before assigning H18.711.