Marginal corneal ulcer, unspecified eye

This code describes an inflammatory lesion of the cornea, specifically located at the periphery, without further specification of the affected eye. A marginal corneal ulcer is characterized by a localized defect in the corneal epithelium and stroma, often associated with immune-mediated processes or bacterial infection.

Use this code when documentation indicates a diagnosis of a marginal corneal ulcer without specifying whether it affects the right or left eye. This diagnosis is typically made by an ophthalmologist based on slit-lamp examination findings. Supporting documentation should clearly state "marginal corneal ulcer" and lack laterality.

• Do not use this code if the laterality (right or left eye) is documented; instead, use the more specific codes for right (H16.041) or left (H16.042) eye.
• Consider additional codes for any underlying systemic conditions or infectious agents if identified and documented.
• Ensure the documentation specifies "marginal" to differentiate from other types of corneal ulcers (e.g., central, ring).