Filamentary keratitis, left eye

This code describes an inflammatory condition of the cornea characterized by the presence of fine, thread-like strands (filaments) composed of epithelial cells and mucus, specifically affecting the left eye. These filaments are typically attached at one end to the corneal surface.

Use this code when documentation clearly indicates filamentary keratitis is present in the patient's left eye. This diagnosis is often associated with conditions causing chronic ocular surface dryness or irritation, such as keratoconjunctivitis sicca or corneal exposure.

• Ensure laterality is precisely documented (left eye).
• Consider co-reporting underlying conditions like dry eye syndrome (e.g., H04.12-) if documented as the etiology.
• Distinguish from other forms of keratitis; the presence of "filaments" is key for this specific code.