ICD-10 Code J12.9 – Viral pneumonia, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code J12.9 – Viral pneumonia, unspecified
What it is
J12.9 identifies pneumonia caused by a virus when the specific viral agent is not documented. Use it for a viral lung infection with pneumonia features, but without a named organism.
Clinical signs
Clinical features vary; refer to documentation. Common findings include cough, fever, shortness of breath, and imaging consistent with pneumonia, with a viral cause noted but not specified.
When to use this code
Use J12.9 when the provider documents viral pneumonia and does not identify the virus, or the record supports a viral etiology without further detail. It also fits discharge summaries or problem lists that state “viral pneumonia, unspecified.”
If a specific virus is named, code that more specific diagnosis instead. Check documentation when the note only says pneumonia, because the cause may be unclear or mixed.
Do not use for
Do not use J12.9 for bacterial, aspiration, or fungal pneumonia. It is also wrong when a more specific viral pneumonia code is documented.
Coding tip
Look for the organism name in the chart; if the virus is identified, choose the more specific ICD-10 code.