ICD-10 Code H11.421 – Conjunctival edema, right eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H11.421 – Conjunctival edema, right eye
What it is
H11.421 identifies swelling of the conjunctiva in the right eye. The conjunctiva is the thin membrane covering the white of the eye and the inner eyelids.
Clinical signs
Typical findings include visible puffiness or ballooning of the conjunctival tissue, often with redness or irritation. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents conjunctival edema limited to the right eye. It may appear as a primary finding or as part of another documented eye condition, but the laterality must be clear. If the record does not specify the right eye, check documentation.
Do not use for
Do not use H11.421 for edema of the eyelid, cornea, or orbit. Do not assign it when the note only states conjunctival redness without edema.
Coding tip
Confirm both laterality and an explicit diagnosis of conjunctival edema before coding.