ICD-10 Code B02.33 – Zoster keratitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B02.33 – Zoster keratitis
What it is
B02.33 identifies keratitis caused by herpes zoster infection, usually involving the cornea after shingles affects the ophthalmic branch. Use it for documented zoster-related corneal inflammation, not for nonspecific eye pain.
Clinical signs
Typical findings include corneal inflammation, eye redness, pain, photophobia, tearing, and reduced vision. Clinical features vary; refer to documentation for confirmed corneal involvement.
When to use this code
Use this code when the provider documents zoster keratitis, herpes zoster ophthalmicus with corneal involvement, or corneal disease attributed to shingles. It applies when the chart clearly links the keratitis to zoster infection. Check documentation if the record only states shingles, conjunctivitis, or ocular symptoms without corneal involvement.
Do not use for
Do not use B02.33 for uncomplicated herpes zoster without keratitis, or for eye irritation that is not documented as corneal disease. If the diagnosis is uncertain, check documentation.
Coding tip
Assign B02.33 only when the cornea is specifically involved and the provider ties the condition to zoster.