Open Enterprise Master Patient Index (OpenEMPI) is an open source implementation of an Enterprise Master Patient (EMPI) which is a repository that maintains a registry of all patients across a distributed enterprise. An EMPI provides many benefits including:

  •  Maintains a central registry of all patients and their demographics, assigning a unique identifier to each patient
  •  Eliminates duplicate patient registration entries that result due to changes in patient demographics (patient moved to another location), data entry errors during patient registration, or missing demographic information.
  •  Provides record locator service by enabling physicians across the enterprise to identify which health care providers a patient has visited.

The key functionality provided by an EMPI is its ability to identify matching patient registration records and link them together as they represent information about a single entity.