Flu due to unidentified influenza virus w oth resp manifest

This code signifies a patient presenting with influenza symptoms, including respiratory involvement beyond a simple upper respiratory infection, where the specific influenza virus type (e.g., A or B) has not been identified or documented. It indicates a confirmed influenza diagnosis with additional respiratory complications.

Apply this code when documentation confirms influenza and specifies respiratory manifestations such as pneumonia, bronchitis, or bronchiolitis, but the physician does not specify the influenza virus type. This is appropriate when laboratory testing for strain identification is pending, inconclusive, or not performed, and the patient exhibits more than just uncomplicated influenza.

• Do not use if the influenza virus type (e.g., H1N1, avian) is identified; instead, use a more specific code from the J09 or J10 series.
• Ensure documentation explicitly states "influenza" and describes respiratory complications beyond a common cold.
• Sequence this code as the primary diagnosis when it is the reason for the encounter.