Flu due to ident novel influenza A virus w oth resp manifest

This code signifies an influenza infection caused by a newly identified strain of influenza A virus, distinct from seasonal variants, presenting with respiratory symptoms beyond a simple upper respiratory infection. These "other respiratory manifestations" could include conditions like bronchitis, bronchiolitis, or pneumonia, indicating a more severe or complicated respiratory involvement.

Apply this code when documentation explicitly states influenza due to a "novel influenza A virus" and details specific respiratory complications such as pneumonia, acute bronchitis, or acute bronchiolitis. This code is appropriate when the physician's assessment links these respiratory issues directly to the novel influenza A infection.

• Ensure documentation clearly specifies "novel influenza A virus" and not just "influenza A" to differentiate from seasonal strains.
• Do not use this code for influenza with only uncomplicated upper respiratory symptoms; a different subcategory would apply.
• Sequence this code as the primary diagnosis when the novel influenza A is the reason for the encounter and the respiratory manifestations are directly attributed to it.