ICD-10 Code H11.423 – Conjunctival edema, bilateral (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H11.423 – Conjunctival edema, bilateral
What it is
H11.423 identifies swelling of the conjunctiva in both eyes. Use it when documentation specifically states bilateral conjunctival edema, also called chemosis.
Clinical signs
Clinical features vary; refer to documentation. Typical findings include visible, puffy conjunctival tissue, often with redness, irritation, or a watery appearance in both eyes.
When to use this code
Use this code when the record clearly documents conjunctival edema affecting both eyes. It may appear as a standalone diagnosis or as a finding associated with allergy, irritation, infection, or trauma. If the chart only says “eye swelling,” check documentation before assigning H11.423.
Do not use for
Do not use it for eyelid edema, corneal swelling, or unspecified ocular swelling. If the laterality is not bilateral or the conjunctival finding is not documented, check documentation.
Coding tip
Confirm both laterality and anatomic site; “chemosis” or “conjunctival swelling” supports H11.423 only when both eyes are involved.