Recent/current research projects include developing a regionally-based measure for early (72 hour) ED returns, an important quality screening measure widely used in emergency medicine; building a notification system to identify and enroll frequent ED users in case management to improve their access to care and reduce ED returns; mapping proprietary CT codes across 40 sites in the Healthix to the newly combined LOINC/RSNA standard terminology and measuring reliability and content-dependent coverage, and developing a simple anatomic ontology for proximity or similarity (SANOPS) as the basis for a future HIE-based duplicate CT alerting system.