Patient Engagement with General Bulk Outreach: Impact of Primary Care Provider vs. Care Team Signature in General Bulk Patient Outreach.

Bulk messaging is an important population health tool used to engage patients in preventive care and chronic disease management, yet little is known about optimal formatting of the communication. One factor to consider is whether the signatory of the patient-facing communication is the patient's own Primary Care Provider (PCP) or a generic care team signature. In this quasi-randomized, non-blinded study we compared identical generic bulk outreach messages directed toward patients with an upcoming appointment and invited them to self-schedule a Medicare Annual wellness visit prior to their scheduled PCP appointment. Twenty-eight PCPs (1582 patients) were assigned to the PCP signature group, and 22 PCPs (1289 patients) to the care team signature group. The primary outcome was patient engagement, defined as a reply to the outreach message. Demographic, utilization, and rates of reading the bulk outreach message were similar between groups. Reply rates were significantly higher in the PCP signature group compared with the care team signature group (39.2% vs. 25.2%; odds ratio 1.86; P < 0.001). These findings suggest that using a patient's own PCP signature in bulk outreach can meaningfully increase engagement, likely leveraging the trust inherent in established PCP-patient relationships. These results may inform health system leaders and population health teams seeking to optimize digital outreach strategies.