ICD-10 Code J12.0 – Adenoviral pneumonia (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code J12.0 – Adenoviral pneumonia
What it is
J12.0 identifies pneumonia caused by adenovirus. Use it when the provider documents adenoviral pneumonia or viral pneumonia specifically attributed to adenovirus.
Clinical signs
Clinical features vary; refer to documentation. Common findings in viral pneumonia include cough, fever, shortness of breath, and imaging consistent with pneumonia.
When to use this code
Use J12.0 when the record clearly states adenoviral pneumonia as the diagnosis. It may also apply when the provider links adenovirus to the pneumonia in the assessment or final impression. If the organism is not specified, check documentation before coding.
Do not use for
Do not use this code for pneumonia due to other viruses or for unspecified viral pneumonia. Do not assign it when adenovirus is mentioned without a documented pneumonia diagnosis.
Coding tip
Code from the provider’s final diagnosis, and verify that adenovirus is explicitly identified as the cause.