ICD-10 Code H16.421 – Pannus (corneal), right eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H16.421 – Pannus (corneal), right eye
What it is
This code identifies corneal pannus in the right eye, meaning superficial blood vessels and scar-like tissue have grown into the cornea. It is a right-eye-specific diagnosis, so laterality matters.
Clinical signs
Typical findings include visible corneal vascularization, haze, and reduced corneal clarity. Clinical features vary; refer to documentation for the extent, cause, and whether the pannus is active or longstanding.
When to use this code
Use H16.421 when the record specifically documents pannus of the cornea in the right eye. You may also use it when the ophthalmology note describes corneal vascularization or fibrovascular ingrowth limited to the right cornea. Check documentation if the condition is bilateral or the eye is not stated.
Do not use for
Do not use this code for left-eye, bilateral, or unspecified corneal pannus. Also avoid it when the note describes a different corneal disorder without pannus; check documentation.
Coding tip
Always verify laterality in the ophthalmology assessment before assigning H16.421.