ICD-10 Code J12 – Viral pneumonia, not elsewhere classified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code J12 – Viral pneumonia, not elsewhere classified
What it is
J12 identifies pneumonia caused by a viral infection when the specific virus is not named elsewhere in the record. Use it for viral lung infection with pneumonic involvement, not for nonspecific upper respiratory illness.
Clinical signs
Common findings include cough, fever, shortness of breath, and chest imaging consistent with pneumonia. Clinical features vary; refer to documentation for the viral cause and whether pneumonia is confirmed.
When to use this code
Use J12 when the provider documents viral pneumonia and does not specify a more exact code for the virus involved. It also fits cases where the chart supports pneumonia of viral origin, but the organism is not further identified. Check documentation if the record only says viral respiratory infection.
Do not use for
Do not use this code for bacterial pneumonia, aspiration pneumonia, or influenza with a separate pneumonia code when another code is documented. Do not assign it for viral bronchitis or nonspecific cough alone.
Coding tip
Look for the named virus in the note first; if it is absent, confirm that pneumonia is actually documented before choosing J12.