ICD-10 Code J09.X2 – Influenza due to identified novel influenza A virus with other respiratory manifestations (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code J09.X2 – Influenza due to identified novel influenza A virus with other respiratory manifestations
What it is
This code identifies influenza caused by a confirmed novel influenza A virus when the main documented problem is another respiratory manifestation, not pneumonia or a nonspecific flu syndrome.
Clinical signs
Expect influenza-like illness with respiratory findings such as cough, sore throat, or upper respiratory involvement. Clinical features vary; refer to documentation for the specific manifestation and confirmed novel influenza A etiology.
When to use this code
Use this code when the record states influenza from an identified novel influenza A virus and the provider documents a respiratory manifestation other than pneumonia. It fits cases where the respiratory condition is clearly linked to the confirmed novel strain. Check documentation if the chart only says suspected flu or does not identify the virus.
Do not use for
Do not use it for seasonal influenza, influenza with pneumonia, or flu without confirmation of a novel influenza A virus. If the manifestation is not respiratory or the documentation is unclear, check documentation.
Coding tip
Match the code to both elements: confirmed novel influenza A virus and the documented other respiratory manifestation.