ICD-10 Code H18.719 – Corneal ectasia, unspecified eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H18.719 – Corneal ectasia, unspecified eye
What it is
H18.719 identifies corneal ectasia when the affected eye is not specified. It describes abnormal thinning and bulging of the cornea that weakens its shape and can affect vision.
Clinical signs
Common findings include progressive corneal steepening, irregular astigmatism, and reduced visual acuity. Clinical features vary; refer to documentation, especially when the eye and cause are not clearly stated.
When to use this code
Use this code when the record documents corneal ectasia but does not specify right or left eye. It also fits encounters where the provider confirms ectasia without naming a more specific corneal disorder. If the note identifies a post-procedure or post-surgical cause, check documentation for a more precise code.
Do not use for
Do not use H18.719 if the chart specifies the right or left eye, or if another corneal diagnosis is documented. Do not assign it for general vision problems without a stated ectasia diagnosis.
Coding tip
Always verify laterality and etiology in the ophthalmology note before defaulting to unspecified eye.