A Study to Quantify Use of Anticoagulation to Improve Management of Atrial Fibrillation

Inclusion Criteria: * Inpatient hospitalization * Primary or secondary discharge International Classification of Diseases (ICD)-9/10 diagnosis code for AF paroxysmal (I48.0), persistent (I48.1), chronic (I48.2), or unspecified (427.31, I48.91) * Proxied Congestive Heart failure (CHA2DS2-VASC) score greater than or equal to (\>=) 2 using ICD-9 diagnosis scoring algorithm developed previously. The scoring algorithm will be expanded to include ICD-10 codes * Discharged to home, skilled nursing facility, inpatient rehabilitation, or nursing home Exclusion Criteria: * Presence of artificial mechanical heart valve by ICD-9/10 diagnosis or procedure code during comorbid identification period or current hospitalization * Surgical procedure during hospitalization for open heart surgery, brain, or spine * Intravenous heparin given on the day of discharge without warfarin/oral anticoagulant (OAC), antiplatelets, and/or aspirin * History of left atrial appendage occlusion, including the Watchman device * Any in-hospital (current hospitalization) bleeding identified by ICD-9/10 diagnosis codes