ICD-10 Code H16.03 – Corneal ulcer with hypopyon (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H16.03 – Corneal ulcer with hypopyon
What it is
H16.03 identifies a corneal ulcer that is accompanied by hypopyon, meaning pus or inflammatory cells have settled in the anterior chamber of the eye. Use it when documentation clearly links both findings.
Clinical signs
Typical findings include a corneal epithelial defect with stromal infiltrate, eye pain, redness, tearing, photophobia, and reduced vision. A visible layered white or yellow fluid level in the anterior chamber supports hypopyon; clinical features vary, refer to documentation.
When to use this code
Use this code when the record states a corneal ulcer and specifically documents hypopyon in the same eye. It fits ophthalmology notes, emergency visits, or discharge summaries that confirm both conditions. If laterality or cause is documented, code it separately when instructed.
Do not use for
Do not use H16.03 for corneal ulcer without hypopyon, or for isolated hypopyon without an ulcer. Check documentation if the note only says keratitis, corneal abrasion, or “anterior chamber reaction.”
Coding tip
Verify that hypopyon is explicitly documented and not merely suspected before assigning H16.03.