ICD-10-CM > J00-J99 > J09-J18 > J11 > J11.0 J11.0 Influenza due to unidentified influenza virus with pneumonia Non-Billable/Non-Specific Code Also associated lung abscess, if applicable (J85.1) Codes J11.00Influenza due to unidentified influenza virus with unspecified type of pneumoniaJ11.08Influenza due to unidentified influenza virus with specified pneumonia