Inclusion Criteria for Patients:  Enrollment with the Michigan Medicine anticoagulation monitoring service Currently prescribed warfarin with anticipated use for greater or equal to 90 days on day 1 of trial enrollment, according to electronic medical record documentation Currently prescribed an antiplatelet drug (aspirin, clopidogrel, ticagrelor, or prasugrel) according to the electronic medical record medication list  Exclusion Criteria for Patients:  Prescribed a Proton Pump Inhibitor (PPI) Documented intolerance or allergy to PPI use Left ventricular assist device Heart transplant  Inclusion Criteria for Clinicians:  Practicing cardiologists at Michigan Medicine who in the prior year had a face-to-face or virtual visit with a patient who meets eligibility criteria for this study Practicing clinicians in any specialty who are designated as the clinician of record with the anticoagulation clinic for a patient who meets eligibility criteria  Exclusion Criteria for Clinicians:  - Cardiologists specializing in electrophysiology unless they are the clinician of record for a patient followed by the anticoagulation service.