ICD-10 Code H18.521 – Epithelial (juvenile) corneal dystrophy, right eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H18.521 – Epithelial (juvenile) corneal dystrophy, right eye
What it is
This code identifies epithelial corneal dystrophy affecting the right eye. It is a hereditary corneal disorder involving abnormal epithelial changes that can disturb the corneal surface.
Clinical signs
Findings may include recurrent corneal erosions, epithelial irregularity, and fluctuating vision. Clinical features vary; refer to documentation.
When to use this code
Use H18.521 when the provider documents epithelial (juvenile) corneal dystrophy in the right eye specifically. Apply it for confirmed unilateral right-eye involvement, even if symptoms are described generally, as long as the diagnosis is clear.
If the record names corneal dystrophy without laterality, check documentation before coding. You should not assume right eye involvement from symptoms alone.
Do not use for
Do not use this code for left eye, bilateral disease, or unspecified corneal dystrophy. Check documentation if the note describes another corneal disorder or does not clearly identify epithelial dystrophy.
Coding tip
Verify laterality from the assessment or impression, not from exam findings alone.