Unspecified keratoconjunctivitis, left eye

This code indicates inflammation of both the cornea and conjunctiva in the left eye, where the specific type or cause of the keratoconjunctivitis has not been identified or documented. It signifies a general inflammatory process affecting the ocular surface of the left eye.

Use this code when the physician's documentation confirms keratoconjunctivitis affecting the left eye, but the specific etiology (e.g., viral, allergic, bacterial, sicca) is not determined or specified. This code is appropriate for initial encounters where further diagnostic workup is pending, or when the cause remains unknown after evaluation.

• Avoid using this code if a more specific type of keratoconjunctivitis (e.g., allergic, viral, sicca) is documented; always code to the highest level of specificity.
• Ensure the documentation clearly specifies "left eye" to support the laterality.
• If the laterality is not specified, consider using the unspecified eye code (H16.209).