ICD-10 Code H16.122 – Filamentary keratitis, left eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H16.122 – Filamentary keratitis, left eye
What it is
Filamentary keratitis is a corneal surface disorder where strands of mucus and epithelial debris adhere to the eye. This code specifies the left eye.
Clinical signs
Patients may report foreign-body sensation, pain, tearing, or light sensitivity. Clinical features vary; refer to documentation for slit-lamp findings such as corneal filaments.
When to use this code
Use H16.122 when the provider documents filamentary keratitis in the left eye. It fits encounters where the diagnosis is confirmed or treated and laterality is clearly stated. Check documentation if the note only says keratitis without specifying filaments or eye side.
Do not use for
Do not use this code for unspecified keratitis, corneal abrasion, or dry eye alone. If the record does not identify the left eye, verify laterality before coding.
Coding tip
Code only when the chart explicitly links filamentary keratitis to the left eye.