certain influenza viruses (J09) or influenza due to other identified influenza virus (J10). • J09.X is used to report a specific strain of influenza (such as “novel” influenza A) that includes avian (bird) influenza, influenza A/H5N1, influenza of other animal origin (not bird or swine), and swine influenza virus, • Category J10, Influenza due to other identified influenza virus, is used to report ordinary seasonal influenza A (non-novel), influenza B, and influenza C • If provider documentation indicates “suspected,” “possible, “probable,” “likely,” utilize category J11 is used for influenza due to unidentified influenza virus • Influenza with any form of pneumonia or bronchopneumonia is assigned to influenza with pneumonia combination code (J09.X1, J10.00–J10.08, and J11.00–J11.08) followed by a code for the specified type of pneumonia • Influenza with other types of respiratory manifestations such as upper respiratory infection, laryngitis, pharyngitis, and pleural effusion are classifiable to J09.X2, J10.1, and J11.1. • Influenza may also involve body systems other than the respiratory system, such as the gastrointestinal tract (J09.X3, J10.2, and J11.2), and other manifestations such as encephalopathy, myocarditis, and otitis media (J09.X9, J10.81–J10.89, and J11.81–J11.89).