Ranked list
The 10 largest medical groups in Connecticut
The same ranking for Connecticut medical groups.
Ranked listRefreshed monthly
The 10 largest medical groups in Massachusetts by physicians
Massachusetts General Physicians Organization (MGPO) is the largest medical group in Massachusetts, with 4,510 physicians, followed by Massachusetts General Hospital in Boston (4,416) and Brigham and Women's Hospital in Boston (3,808).
- Massachusetts General Physicians Organization (MGPO)4,510physicians6,747HCPs
- Massachusetts General Hospital4,416physicians6,587HCPs
- Brigham and Women's Hospital3,808physicians5,366HCPs
- Harvard Medical Faculty Physicians at Beth Israel Deaconess Medical Center (HMFP)2,362physicians3,206HCPs
- UMass Memorial Medical Group2,058physicians3,423HCPs
- Steward Medical Group1,990physicians3,027HCPs
- Lahey Clinic1,351physicians2,218HCPs
- Beth Israel Deaconess Medical Center1,228physicians1,526HCPs
- Harvard Medical Faculty Physicians at Beth Israel Deaconess Medical Center1,102physicians1,539HCPs
- Baystate Medical Practices1,091physicians1,827HCPs
The 10 largest of 1,409 Massachusetts medical groups that report physicians. Ranks compare size, not quality of care.
Every medical group in MassachusettsThe median Massachusetts medical group has 4 physicians
1,409 Massachusetts medical groups report physicians. The median medical group has 4 physicians, so Massachusetts General Physicians Organization (MGPO) is about 1,128 times that size.
- the size of the median Massachusetts medical group, which has 4 physicians
- 1,128×
- of the 1,409 Massachusetts medical groups that report physicians
- 0.7%
How we ranked the largest Massachusetts medical groups
- Measure
- Physicians linked to each group in CMS enrollment and the Dmand AI database.
- What counts as a group
- One Medicare PAC ID. A group that bills under several names counts once.
- Field
- 1,409 Massachusetts medical groups in the Dmand AI database report physicians.
- Ties
- Medical groups with the same number share a rank.
- HCPs
- Healthcare professionals with a current link to the group in the Dmand AI database.
- What a rank means
- Size only. A rank compares physicians; it says nothing about quality of care.
- Refresh
- Monthly. Updated Oct 28, 2026.
FAQ
Questions about the largest Massachusetts medical groups
Answers from the same data, updated monthly.
What is the largest medical group in Massachusetts?
Massachusetts General Physicians Organization (MGPO) in Boston, with 4,510 physicians. Massachusetts General Hospital is second with 4,416.
What are the 10 largest medical groups in Massachusetts?
By physicians: Massachusetts General Physicians Organization (MGPO) (4,510), Massachusetts General Hospital (4,416), Brigham and Women's Hospital (3,808), Harvard Medical Faculty Physicians at Beth Israel Deaconess Medical Center (HMFP) (2,362), UMass Memorial Medical Group (2,058), Steward Medical Group (1,990), Lahey Clinic (1,351), Beth Israel Deaconess Medical Center (1,228), Harvard Medical Faculty Physicians at Beth Israel Deaconess Medical Center (1,102), Baystate Medical Practices (1,091).
How many physicians does a typical Massachusetts medical group have?
The median Massachusetts medical group that reports physicians has 4 physicians, out of 1,409 that report them.
How often is this list updated?
Every month, when the Dmand AI database refreshes. This version is from Oct 28, 2026.
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