ICD-10 Code B30.9 – Viral conjunctivitis, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B30.9 – Viral conjunctivitis, unspecified
What it is
B30.9 identifies viral conjunctivitis when the provider documents a viral cause but does not name a specific virus. It refers to inflammation of the conjunctiva, usually affecting one or both eyes.
Clinical signs
Typical findings include red, watery eyes, irritation, and a gritty or burning sensation. Clinical features vary; refer to documentation for laterality, associated upper respiratory symptoms, or other specific findings.
When to use this code
Use B30.9 when the record clearly states viral conjunctivitis and no more specific viral type is documented. It also fits cases where the clinician documents conjunctivitis as viral but does not identify the organism. If the note specifies a different viral conjunctivitis code, use that code instead.
Do not use for
Do not use this code for bacterial, allergic, or chemical conjunctivitis. Do not assign it when documentation supports a more specific viral diagnosis or when the cause is not documented; check documentation.
Coding tip
Query for the exact viral cause and laterality if the note is vague, because a more specific code may be available.