ICD-10 Code H16.0 – Corneal ulcer (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H16.0 – Corneal ulcer
What it is
Corneal ulcer is an open sore or erosion on the cornea, the clear front surface of the eye. It usually reflects significant corneal inflammation or infection and needs prompt documentation.
Clinical signs
Typical findings include eye pain, redness, tearing, light sensitivity, and blurred vision. Clinical features vary; refer to documentation, especially when the record notes corneal defect, infiltrate, or ulceration.
When to use this code
Use H16.0 when the provider documents a corneal ulcer or clearly states ulcerative keratitis. It is appropriate when the diagnosis is confirmed in the assessment, problem list, or ophthalmology note. If the record only mentions corneal abrasion, foreign body, or unspecified keratitis, check documentation before coding.
Do not use for
Do not use this code for superficial corneal abrasion or nonulcerative keratitis. If the note does not clearly identify ulceration, you should not assume H16.0.
Coding tip
Look for the provider’s exact wording, because corneal ulcer and corneal abrasion are not interchangeable.