ICD-10 Code H18.601 – Keratoconus, unspecified, right eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H18.601 – Keratoconus, unspecified, right eye
What it is
H18.601 identifies keratoconus in the right eye when the record does not specify a subtype. It means the cornea is progressively thinning and bulging into a cone shape, affecting vision.
Clinical signs
Typical findings include irregular astigmatism, blurred or distorted vision, and increasing sensitivity to light or glare. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents keratoconus limited to the right eye and does not identify a more specific form. It is appropriate for ophthalmology notes, problem lists, or claims tied to confirmed diagnosis. If laterality or subtype is documented differently, check documentation before coding.
Do not use for
Do not use it for keratoconus of the left eye, bilateral disease, or unspecified eye laterality. Do not assign it when the chart only mentions corneal ectasia or another corneal disorder without confirming keratoconus.
Coding tip
Verify laterality and whether the diagnosis is truly unspecified before selecting H18.601.