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, 101 to 150
#	Medical group	Parent organization	Physicians	HCPs	Decision makers
101	Kidney Care and Transplant Services of New EnglandSpringfield · 5 sites	-	20	20	Decision makers
102	Charter Health PCSalem · 7 sites	-	19	74	Decision makers
103	Manet Community Health CenterQuincy · 7 sites	Parent on file	19	72	Decision makers
104	Form HealthBoston · 8 sites	Parent on file	19	26	Decision makers
105	Upham's Corner Health CenterDorchester · 8 sites	Parent on file	18	59	Decision makers
106	Circle Health Urgent CareLowell · 7 sites	Parent on file	18	52	Decision makers
107	Tufts Medical Center Community CareBraintree · 5 sites	Parent on file	18	29	Decision makers
108	Commonwealth Nephrology AssociatesNorfolk · 5 sites	-	18	18	Decision makers
109	New England Community Medical ServicesChelmsford · 4 sites	-	17	60	Decision makers
110	Mass Lung & AllergyLeominster · 9 sites	-	17	27	Decision makers
111	Merrimack Valley CardiologyNorth Chelmsford · 2 sites	Parent on file	17	24	Decision makers
112	New England Community Medical ServicesChelmsford · 4 sites	-	16	57	Decision makers
113	New Bedford Community HealthNew Bedford · 5 sites	Parent on file	16	55	Decision makers
114	AFC Urgent Care SpringfieldSpringfield · 15 sites	Parent on file	15	106	Decision makers
115	Kidney Care and Transplant Services of New EnglandSpringfield · 10 sites	-	15	18	Decision makers
116	instEDBoston · 4 sites	Parent on file	15	16	Decision makers
117	Hampden & Franklin County Cardiovascular AssociatesGreenfield · 7 sites	-	14	26	Decision makers
118	South Shore CardiologySouth Weymouth · 2 sites	Parent on file	14	19	Decision makers
119	Mattapan Community Health CenterBoston · 4 sites	Parent on file	13	33	Decision makers
120	Adfinitas HealthSpringfield · 3 sites	Parent on file	13	29	Decision makers
121	The Heart Center of MetroWestFramingham · 3 sites	-	13	26	Decision makers
122	South Shore Internal Medicine AssociatesMilton · 2 sites	-	13	16	Decision makers
123	Mount Auburn Cardiology Associates, Inc.Cambridge · 2 sites	Parent on file	13	13	Decision makers
124	Pioneer Valley Cardiology AssociatesSpringfield · 5 sites	Parent on file	12	34	Decision makers
125	Gastro Health ChelmsfordChelmsford · 5 sites	Parent on file	12	29	Decision makers
126	Gastro Health, ActonActon · 3 sites	Parent on file	12	21	Decision makers
127	Lown GroupChestnut Hill · 3 sites	-	12	14	Decision makers
128	PersonalMDsBrookline · 2 sites	-	12	12	Decision makers
129	North Shore Community HealthSalem · 5 sites	Parent on file	11	46	Decision makers
130	Community Physicians AssociatesMilton · 5 sites	Parent on file	11	43	Decision makers
131	360 HealthcareBurlington · 7 sites	Parent on file	11	35	Decision makers
132	Newburyport InCare Pulmonary and Sleep SpecialistsNewburyport · 6 sites	-	11	24	Decision makers
133	Amwell Medical Group (also known as Online Care Group)Boston · 9 sites	-	11	23	Decision makers
134	Wellesley Primary Care MedicineWellesley · 2 sites	-	11	18	Decision makers
135	Berkshire Family Practice AssociatesPittsfield · 1 site	Parent on file	11	16	Decision makers
136	Rehabilitation Medical AssociatesBraintree · 3 sites	Parent on file	11	15	Decision makers
137	Digestive Health AssociatesStoneham · 3 sites	Parent on file	11	13	Decision makers
138	Gastroenterology HealthCare AssociatesNewton · 2 sites	Parent on file	11	12	Decision makers
139	Retina Consultants of WorcesterWorcester · 2 sites	-	11	11	Decision makers
140	AFC Doctors Express Urgent Care WalthamWaltham · 15 sites	Parent on file	10	85	Decision makers
141	AFC Urgent Care WatertownWatertown · 5 sites	Parent on file	10	39	Decision makers
142	Charter Health PCSalem · 3 sites	-	10	39	Decision makers
143	Lianne Inc. Medical GroupWorcester · 4 sites	-	10	29	Decision makers
144	Pembroke Medical AssociatesPembroke · 3 sites	Parent on file	10	27	Decision makers
145	Family Practice Group, P.C. The Sagov Center for Family MedicineArlington · 3 sites	-	10	24	Decision makers
146	Congenial HealthcarePeabody · 6 sites	Parent on file	10	18	Decision makers
147	Mount Auburn Cardiology Associates, Inc.Cambridge · 3 sites	-	10	12	Decision makers
148	Wellesley Primary CareWellesley · 1 site	-	10	10	Decision makers
149	Blueprint Healthcare Medical GroupNorth Andover · 26 sites	-	9	24	Decision makers
150	Internal Medicine Physicians of the North ShorePeabody · 2 sites	-	9	16	Decision makers

Showing 101 to 150 of 677 primary care groups in Massachusetts

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

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