Influenza due to unidentified influenza virus w GI manifest

This code signifies a diagnosis of influenza where the specific influenza virus type has not been identified, and the patient presents with associated gastrointestinal symptoms such as nausea, vomiting, or diarrhea. It indicates a systemic viral infection primarily affecting the respiratory system but with significant GI involvement.

Apply this code when documentation confirms influenza with gastrointestinal manifestations, but the specific influenza strain (e.g., H1N1, H3N2) is not specified. This is appropriate when a definitive viral identification test is pending or not performed, and the clinician explicitly links the GI symptoms to the influenza infection.

• Do not use this code for viral gastroenteritis (intestinal flu) without evidence of a systemic influenza infection.
• Ensure documentation clearly states "influenza" and "gastrointestinal manifestations" without identifying the specific influenza virus.
• Sequence as the primary diagnosis when the influenza with GI symptoms is the reason for the encounter.