SUN-848 - Evaluating the Accuracy and Timeliness of the Bidirectional Data Exchange Between Individual Vaccine Providers and the Immunization Information System.

Background: Administration of age-appropriate vaccinations is a key recommendation for reducing mortality among patients with diabetes. Having accurate and timely vaccination information available in a central repository like the state Immunization Information Systems (IIS) is crucial in efforts to improve vaccination uptake.
In this quality improvement project, we evaluated the accuracy of our patient’s vaccination records available in the IIS and the timing of the bidirectional communication between IIS and individual vaccine providers.

Methods: This project was conducted in an adult endocrinology practice and included ambulatory patients with diabetes who were evaluated during the 2025/2026 influenza season. We downloaded the influenza vaccination information from our electronic medical record (EMR) for all patients who completed at least 1 clinic visit between September 2025 and March 2026. We then manually queried the state IIS (WebIZ) to verify vaccination status for all the patients. For those who had their vaccination record available in the IIS, we evaluated the duration between the date of vaccine administration and the date the vaccine information became available in the IIS. We then analyzed the data using frequency distributions and proportion analyses.

Results: A total of 883 unique patients were included. A review of the EMR and IIS records revealed 329 total vaccinations for a vaccination rate of 37.2%. Among the 329 vaccinated patients, 269 (81.7%) had vaccination information available in the IIS while 60 did not. Among those patients with vaccination information in the IIS, 234 (87%) were received by the IIS within 1 day of vaccine administration, 24 (9%) in 2 to 7 days, 8 (3%) in 8 – 30 days and 3 (1%) after 30 days. Of the 60 patients whose vaccination information were not available in the IIS, 56 received their vaccine at our clinic while 4 records could not be retrieved.

Conclusion: Most influenza vaccination information was available to the IIS and were updated within 1 day of administration. Majority of the patients whose information was not up to date in the IIS received their vaccination at our clinic, suggesting significant communication issues between our EMR and the IIS. Delayed update of the IIS compromises clinical decision making and increases the risk of duplicate vaccinations.

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