ICD-10 Code H16.12 – Filamentary keratitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H16.12 – Filamentary keratitis
What it is
Filamentary keratitis is an eye surface disorder where small strands of mucus and damaged epithelial cells adhere to the cornea. It usually causes irritation and discomfort rather than vision loss.
Clinical signs
Common findings include foreign-body sensation, tearing, redness, and pain, especially when blinking. Clinical features vary; refer to documentation.
When to use this code
Use H16.12 when the provider documents filamentary keratitis by name or clearly describes corneal filaments on examination. You may also use it when the note identifies this specific corneal surface condition in the assessment.
Check documentation if the record only mentions nonspecific keratitis, dry eye, or corneal irritation without confirming filaments.
Do not use for
Do not use this code for general conjunctivitis, corneal abrasion, or dry eye alone unless filamentary keratitis is specifically documented. Check documentation.
Coding tip
Code the condition only when the chart shows filamentary keratitis, not just eye discomfort or redness.