The intervention trial in Phase 2 will be comprised of two groups, control and experimental. Both the control and experimental group will receive standard care, which includes access to MyChart. In addition to standard care, both groups will receive training on the use of MyChart and the AdhereTech smart pill bottle, and medication adherence for both groups will be monitored with Surescripts e-prescribing software and AdhereTech smart pill bottle use. The experimental group will receive the intervention: tailored health messaging delivered via MyChart pertinent to AF and oral anticoagulant use.