Enterprise Master Person Index (EMPI)

The DSS implemented the EMPI in January 2016 with a goal of creating a consolidated view of patient/person information across disparate source systems as well as workflow and basic reporting tools for ongoing maintenance of the system.  Today the EMPI is used by the state’s eligibility and enrollment system (DSS-ImpaCT) and the state’s Health Insurance Exchange (HIX) system Access Health Connecticut (AhCT). EMPI is hosted by the State’s Bureau of Enterprise Systems and Technology (BEST).  The state uses NextGate’s EMPI as the technology solution.

The EMPI serves as an authoritative source of person information.  Additionally, EMPI assists in resolving pstient/person identity issues, and promotes the exchange of accurate information across the healthcare ecosystem.  Essentially, EMPI serves as an enterprise solution across a healthcare organization to maintain consistent, accurate and current demographic data on people. Each person is assigned a unique identifier that is used to refer to him or her across enterprises. The main objective is to ensure that each person is represented only once across all these systems.


Currently, Phase II (2018-19) work includes 1) upgrading the platform 2) onboarding additional subscribing systems, 3) implementing the Relation Registry, 4) integration with Project Notify, and 5) integration with the Medicaid HIE platform (HealthShare).  Preliminary discussions have occurred with at least nine sister agencies, with six agencies expressing interest in the use of this technology.  Many state agencies operate/purchase/create independent entity management solutions to support direct care delivery functions. A shared technology solution can support interoperability within and across agencies as well as support the exchange of information to coordinate services and support better care for people.


2018 LeanCT Showcase

Thumbnail image of Lean Poster.  EMPI Brochure
 Leading Through Change Poster
 EMPI Brochure


The Department of Social Services (DSS) is responsible for Health Information Technology (Health IT), including Health Information Exchange (HIE) for the State’s Medicaid population. The DSS has made steady progress on implementing its roadmap for Health IT and HIE in Connecticut focusing on Medicaid beneficiaries. Our strategic goals are aligned with Health IT vision and goals of the Office of the National Coordinator for Health Information Technology (ONC) and the Centers for Medicare and Medicaid Services (CMS).  This vision is anchored in providing an integrated person-centered system facilitating, efficient and evidence-based health care delivery for all Connecticut residents.



Contributing System

June 2017

October 2017

January 2018

 April 2018

Dept. of Social Services



3,079,138 3,099,635

Insurance Exchange



1,684,210 1,711,135


Enterprise Unique IDs



3,214,654 3,236,315



If you would like additional information on this project or would like to leverage our technology, please contact Dr. Minakshi Tikoo at Minakshi.tikoo@ct.gov.

Updated 4/25/2018