In simple words: The patient has the flu, caused by a specific, known flu virus, and they also have pneumonia.

This code indicates that the patient has influenza caused by a known influenza virus other than novel influenza A or swine flu, and this influenza has led to pneumonia.It excludes avian influenza, swine flu, influenza due to unidentified influenza virus, allergic or eosinophilic pneumonia, aspiration pneumonia NOS, meconium pneumonia, neonatal aspiration pneumonia, pneumonia due to solids and liquids, congenital pneumonia, lipid pneumonia, rheumatic pneumonia, and ventilator-associated pneumonia.

Example 1: A patient presents with fever, cough, shortness of breath, and muscle aches.Testing confirms influenza B, and a chest x-ray reveals pneumonia. J10.0 would be used., A child with a history of asthma develops a high fever, cough, and difficulty breathing.Influenza C is confirmed, and the child is diagnosed with pneumonia. J10.0 is applicable., An elderly patient in a nursing home develops a cough, fever, and chills. Influenza A (non-novel) is diagnosed, and the patient subsequently develops pneumonia.J10.0 is the appropriate code.

Documentation should include the confirmed influenza virus type (e.g., influenza A, B, or C, but not novel or swine flu), signs and symptoms of influenza (such as fever, cough, muscle aches), and evidence of pneumonia from physical exam and imaging studies (like chest x-ray).

** It is crucial to distinguish J10.0 from codes for influenza due to novel influenza A (J09.X1) or swine flu (J09.X2 with pneumonia), as these are distinct conditions.Also, conditions like allergic or eosinophilic pneumonia (J82), aspiration pneumonia (J69.0), or ventilator-associated pneumonia (J95.851) are excluded from J10.0 and have their own specific codes.