Flu due to oth ident flu virus w unsp type of pneumonia

This code signifies a patient presenting with influenza caused by a specific, but not otherwise classified, influenza virus, accompanied by pneumonia where the specific type of pneumonia is not documented. It indicates a confirmed influenza infection with a pulmonary complication, but without further etiological or morphological detail for the pneumonia.

This code is appropriate when documentation specifies influenza due to an identified influenza virus (e.g., "influenza A, not H1N1" or "influenza B") and also notes the presence of pneumonia, but the physician does not specify the type of pneumonia (e.g., "pneumonia," "viral pneumonia NOS"). It requires clear documentation of both the influenza virus type (other than H1N1 or avian flu) and the co-occurrence of pneumonia.

• Do not use if the specific type of pneumonia (e.g., bacterial, aspiration) is documented; instead, code to the specific type of pneumonia with the influenza code.
• Ensure the influenza virus is identified as "other" and not H1N1 or avian influenza, which have their own specific codes.
• Always sequence the influenza code first, as it is the underlying systemic infection causing the pneumonia.