At the outset, the in-house team decided that an Enterprise Master Patient Index (EMPI) cleanup was critical to project success. Subsequently, the health network turned to the unique partnership of e4health and Verato to undertake the complicated, multi-layered MPI cleanup effort. e4health led the project with a six-phase approach: holistic assessment, preparation, decision-making, data migration, analytics/reporting, and ongoing evaluation. In addition, a sophisticated rules-based strategy drove decisions and survivorship rules based on relationships with facilities and 400+ downstream systems.