Anesthesia and hypoesthesia of cornea, bilateral

This code signifies a diminished or absent sensation in the corneas of both eyes. It indicates a bilateral corneal nerve dysfunction leading to reduced sensitivity to touch, temperature, or pain. This can result in impaired protective reflexes and increased risk of corneal injury.

Apply this code when documentation explicitly states bilateral corneal anesthesia or hypoesthesia. This is often seen in conditions affecting the trigeminal nerve, such as herpes zoster ophthalmicus, neurotrophic keratopathy, or following extensive corneal surgery. Supporting documentation should include findings from corneal sensitivity testing (e.g., using a cotton wisp or esthesiometer).

• Ensure the documentation clearly specifies bilateral involvement; avoid using this code for unilateral cases.
• Distinguish from corneal opacity (H17.-) or other corneal disorders that do not primarily involve sensation.
• Code any underlying cause of the corneal anesthesia/hypoesthesia first, if known and documented.