Updated October 2026

Largest primary care groups in Massachusetts

Medical group directory
Massachusetts
Primary care

Groups: 677
Internal Medicine groups: 339
Nurse Practitioner groups: 200
Internal medicine specialists: 8,000
Nurse practitioner specialists: 498

There are 677 primary care groups in Massachusetts with a Medicare PAC ID: 339 internal medicine, 200 nurse practitioner, 105 family medicine, 27 physician assistant, 3 clinical nurse specialist and 3 general practice. Massachusetts General Physicians Organization (MGPO) is the largest internal medicine group, with 1,331 internal medicine specialists, and Walk-In MD Urgent Care the largest nurse practitioner group, with 15 nurse practitioner specialists.

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Massachusetts General Physicians Organization (MGPO) is the largest primary care group in Massachusetts, with 3,803 physicians

Ranked by physicians with a Massachusetts address linked to each group. Massachusetts General Hospital is second with 3,723, and Brigham and Women's Hospital third with 3,175. 56 Massachusetts groups have 100 or more physicians.

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Primary care groups in Massachusetts, ranked by physicians, 51 to 100
#	Medical group	Parent organization	Physicians	HCPs	Decision makers
51	Falmouth HospitalHyannis · 9 sites	Parent on file	131	211	Decision makers
52	Beth Israel Deaconess Hospital-Plymouth (BID-Plymouth)Plymouth · 22 sites	Parent on file	128	251	Decision makers
53	Saint Vincent Medical GroupWorcester · 24 sites	Parent on file	122	214	Decision makers
54	Charlton Memorial HospitalFall River · 17 sites	Parent on file	121	160	Decision makers
55	Heywood Medical GroupGardner · 12 sites	Parent on file	120	213	Decision makers
56	Nantucket Cottage HospitalNantucket · 20 sites	Parent on file	103	163	Decision makers
57	MIT HealthCambridge · 11 sites	Parent on file	96	145	Decision makers
58	Greater Lawrence Family Health CenterLawrence · 13 sites	Parent on file	95	138	Decision makers
59	Harvard University Health ServicesCambridge · 16 sites	Parent on file	94	154	Decision makers
60	Boston University Department of Family MedicineBoston · 13 sites	Parent on file	92	113	Decision makers
61	Trinity Health Of New England Medical GroupSpringfield · 26 sites	Parent on file	90	175	Decision makers
62	Hospitalist Physicians of Massachusetts PCFramingham · 15 sites	-	82	123	Decision makers
63	South Boston Community Health CenterSouth Boston · 11 sites	Parent on file	79	128	Decision makers
64	Cardiovascular Center at Tufts Medical CenterBoston · 13 sites	Parent on file	77	156	Decision makers
65	New England Inpatient SpecialistsChelmsford · 14 sites	Parent on file	77	100	Decision makers
66	Fairview HospitalGreat Barrington · 7 sites	Parent on file	76	121	Decision makers
67	New England Baptist HospitalBoston · 14 sites	Parent on file	69	126	Decision makers
68	New England Inpatient SpecialistsChelmsford · 12 sites	Parent on file	68	96	Decision makers
69	Charles River Medical AssociatesAshland · 25 sites	-	64	144	Decision makers
70	Joslin Diabetes CenterBoston · 11 sites	Parent on file	64	118	Decision makers
71	Greater Roslindale Medical and Dental CenterRoslindale · 12 sites	Parent on file	61	98	Decision makers
72	DotHouse HealthDorchester · 11 sites	Parent on file	48	104	Decision makers
73	Compass MedicalEast Bridgewater · 16 sites	-	48	98	Decision makers
74	Ipc Hospitalists Of New EnglandSpringfield · 21 sites	-	45	130	Decision makers
75	Valley Medical GroupGreenfield · 8 sites	-	44	162	Decision makers
76	Family Health Center of WorcesterWorcester · 8 sites	Parent on file	41	124	Decision makers
77	Codman Square Health CenterDorchester · 7 sites	Parent on file	41	96	Decision makers
78	Edward M. Kennedy Community Health CenterWorcester · 10 sites	Parent on file	39	134	Decision makers
79	InCare Pulmonary and Sleep SpecialistsNorth Andover · 8 sites	-	39	66	Decision makers
80	Harbor HealthMattapan · 11 sites	Parent on file	38	119	Decision makers
81	Lowell Community Health CenterLowell · 7 sites	Parent on file	37	143	Decision makers
82	Vantage HealthcareCanton · 68 sites	Parent on file	34	122	Decision makers
83	CHP Great Barrington Community Health CenterGreat Barrington · 13 sites	Parent on file	34	87	Decision makers
84	Acton Medical AssociatesActon · 1 site	-	29	58	Decision makers
85	New England Inpatient SpecialistsChelmsford · 3 sites	Parent on file	29	36	Decision makers
86	Hebrew Rehabilitation CenterRoslindale · 4 sites	Parent on file	28	61	Decision makers
87	InCare Pulmonary and Sleep SpecialistsNorth Andover · 5 sites	-	28	45	Decision makers
88	St. Elizabeth's Medical CenterBoston · 5 sites	Parent on file	28	33	Decision makers
89	Integrated Gastroenterology ConsultantsNorth Chelmsford · 5 sites	-	27	60	Decision makers
90	Community Health Center of Cape CodMashpee · 5 sites	Parent on file	26	65	Decision makers
91	Holyoke Health CenterHolyoke · 3 sites	Parent on file	26	54	Decision makers
92	Saint Anne's HospitalFall River · 5 sites	Parent on file	26	37	Decision makers
93	South Cove Community Health CenterBoston · 6 sites	Parent on file	25	53	Decision makers
94	InCare Pulmonary and Sleep SpecialistsNorth Andover · 6 sites	-	25	48	Decision makers
95	Greater Boston GastroenterologyFramingham · 6 sites	Parent on file	25	34	Decision makers
96	Greater Boston GastroenterologyFramingham · 5 sites	Parent on file	23	33	Decision makers
97	Wellesley Family Care AssociatesWellesley · 2 sites	-	23	26	Decision makers
98	MFM HealthMiddleton · 3 sites	-	22	78	Decision makers
99	Outer Cape Health ServicesProvincetown · 8 sites	Parent on file	22	65	Decision makers
100	Advocate Healthcare of East BostonEast Boston · 11 sites	Parent on file	21	52	Decision makers

Showing 51 to 100 of 677 primary care groups in Massachusetts

Sources: Doctors and Clinicians National Downloadable File (CMS) and Dmand AI Affiliation Data

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