Patient admitted with new onset AF. Also c/o some chest pain. D-dimer was elevated. Chest CT was done showing small bilateral pleural effusions. Pleural effusion was documented by the attending and likely felt to be related to the AF. No further workup was done. If coded, pleural effusion would be only CC. I feel the diagnosis should not be coded as it does not meet secondary diagnosis. If you feel this should be coded and can you please explain you're thoughts on why. .