Zoster keratitis

This code identifies an inflammation of the cornea caused by the varicella-zoster virus, typically occurring as a complication of herpes zoster ophthalmicus. It presents with characteristic dendritic or pseudodendritic lesions on the corneal surface, often accompanied by pain, photophobia, and blurred vision.

Apply this code when documentation clearly indicates corneal involvement due to a herpes zoster infection. This diagnosis is supported by a history of shingles affecting the ophthalmic division of the trigeminal nerve, along with slit-lamp examination findings consistent with keratitis.

• Always sequence this code after the primary diagnosis for herpes zoster ophthalmicus (B02.30, B02.31, B02.32, or B02.39).
• Do not use this code for keratitis due to herpes simplex virus; refer to codes in the H16.2- category for those conditions.
• Ensure the medical record specifies "zoster" or "herpes zoster" to differentiate from other forms of keratitis.