Background: Patients receiving antineoplastic therapy are at increased risk of severe illness and death from COVID-19. Vaccination against COVID-19 is an effective strategy to prevent serious complications of the disease. Because immunocompromised patients may have a blunted immune response to COVID-19 vaccinations, the CDC recommends these patients receive an additional vaccine dose. CDC recommendations serve as a guideline for optimal care of hematology/oncology patients, and within which we demonstrate a quality improvement project to promote community education and assess vaccination rates. Methods: Through Epic electronic medical record (EMR) reporting, we identified 250 immunocompromised patients who had not completed their primary COVID-19 vaccination series or booster and initiated antineoplastic therapy between 12/1/2020- 12/1/2021 at a community-based oncology practice in Michigan. Patients were provided an electronic patient portal letter detailing vaccination recommendations, information on how to obtain vaccination, and a survey inquiring if patients were more likely to become vaccinated after the educational intervention. 204 patients received electronic letters and 46 patients (without portal access) were sent a letter via the US postal service. Three months post intervention, we evaluated for change in COVID vaccination status, hospitalization, death rates, and patient preferences regarding vaccination. Results: Three months post intervention, a total of 44 patients responded to the survey (39 electronically and 5 via mail). The overall improvement in vaccination rate was 10.4%. Using Fisher’s exact test, we found a statistically significant difference (p = 0.002) in vaccination rates between survey responders compared to non-responders. Vaccination rates increased by 25.0% in survey responders, compared to 7.3% in patients who did not respond. During the study period, 13 patients contracted COVID-19 (1/13 vaccinated), and one patient required hospitalization due to COVID-19 (unvaccinated). No deaths due to COVID-19 were reported. Patients’ most cited reasons for declining vaccination were concerns regarding vaccination safety and lack of understanding of the CDC recommendations. Conclusions: Our study highlights the EMR as an effective means to provide community education about COVID-19 vaccination. Limitations include delayed outreach to patients without electronic patient portal access or with infrequent patient portal use. Nonetheless, our quality study design serves as a model for other implementations of electronic community outreach in oncology patients. Future directions will assess long-term vaccination rates and outcomes in these immunocompromised patients.