ICD-10 Code H20.05 – Hypopyon (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H20.05 – Hypopyon
What it is
Hypopyon means visible pus or inflammatory white cells layering in the front chamber of the eye. It usually signals significant anterior segment inflammation and needs prompt clinical attention.
Clinical signs
You may see a white or yellow fluid level in the anterior chamber, often with redness, pain, photophobia, or decreased vision. Clinical features vary; refer to documentation.
When to use this code
Use H20.05 when the record specifically documents hypopyon as the diagnosis or a confirmed exam finding. It fits cases where the provider identifies inflammatory layering in the anterior chamber, with or without an underlying uveitis diagnosis. Check documentation if the note only mentions eye redness or suspected infection.
Do not use for
Do not use this code for simple conjunctivitis, corneal opacity, or nonspecific eye discharge. If the provider documents a different anterior chamber finding, code that condition instead.
Coding tip
Code hypopyon only when the documentation clearly names it; otherwise, query for specificity.