ICD-10 Code H11.42 – Conjunctival edema (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H11.42 – Conjunctival edema
What it is
H11.42 identifies edema of the conjunctiva, meaning swelling of the clear membrane covering the white of the eye and inner eyelids. Use it when documentation specifically states conjunctival edema or chemosis.
Clinical signs
Typical findings include visible conjunctival swelling, a boggy or puffy appearance, and possible redness or irritation. Clinical features vary; refer to documentation.
When to use this code
Use H11.42 when the provider documents conjunctival edema as the diagnosis, even if the cause is not stated. It may appear with allergic, inflammatory, or traumatic eye conditions, but you should code the documented condition as recorded. If the note only describes eye redness or discharge, check documentation before assigning this code.
Do not use for
Do not use this code for eyelid swelling, corneal edema, or general facial edema. If the record names a different ocular disorder, code that condition instead.
Coding tip
Assign H11.42 only when the swelling is documented as conjunctival, not simply “eye swelling.”