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Top physician groups
Ranked by number of participating physicians

No. of physicians
Chief executive
Year founded
1UMass Memorial Medical Group
365 Plantation St., Biotech One, Worcester 01605
508-334-1000 •
Stephen Tosi
Nonprofit group owned by UMass Memorial Health Care; primary care and specialty providers
1998 *
2Reliant Medical Group **
630 Plantation St., Worcester 01605
508-852-0600 •
Tarek Elsawy
president & CEO
Multi-specialty, nonprofit medical group serving Central Mass. and MetroWest
3Steward Health Care Network
Central Mass. Local Chapter
427 Main St., 3rd Floor, Worcester 01608
508-438-1100 •
Mark Girard
president, Steward Health Care Netwok
Multi-specialty, clinically integrated group of providers not affiliated with a hospital

Source: Each group via survey or website
* Year UMass Memorial Health Care formed
** Doctors and trustees unanimously voted to be acquired by OptumHealth, a Minnesota-based division of national insurer UnitedHealth, in April and May.
*** Formerly Central Massachusetts Independent Physician Association (CMIPA)
- Compiled by: Heide Martin,
Copyright 2017 New England Business Media