I48 Atrial fibrillation and flutterNon-billable header with 6 child codes.
I48.0 Paroxysmal atrial fibrillationI48.1 Persistent atrial fibrillationI48.2 Chronic atrial fibrillationI48.3 Typical atrial flutterI48.4 Atypical atrial flutterI48.9 Unspecified atrial fibrillation and atrial flutterM35.81 Multisystem inflammatory syndrome ("cardiac arrhythmia (I47-I49.-)")R00 Abnormalities of heart beat ("specified arrhythmias (I47-I49)")M35.81 Multisystem inflammatory syndrome ("cardiac arrhythmia (I47-I49.-)")R00 Abnormalities of heart beat ("specified arrhythmias (I47-I49)")