Updated October 2026

Medical groups in Boston, MA

Medical group directory
Boston, Massachusetts

Medical groups: 158
Multi-specialty: 48
Single-specialty: 110
More than one site: 107
100+ physicians: 16

There are 158 medical groups in Boston with a Medicare PAC ID. Massachusetts General Physicians Organization (MGPO) is the largest, with 3,803 Massachusetts physicians, followed by Massachusetts General Hospital with 3,723. 30% of Boston groups are independent.

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

Ranked by physicians with a Massachusetts address linked to each group based in Boston. Massachusetts General Hospital is second with 3,723, and Brigham and Women's Hospital third with 3,175. 16 Boston groups have 100 or more physicians.

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Medical groups in Boston, ranked by physicians
#	Medical group	Parent organization	Physicians	HCPs	Decision makers
1	Massachusetts General Physicians Organization (MGPO)Boston · 296 sites	Parent on file	3,803	5,784	Decision makers
2	Massachusetts General HospitalBoston · 124 sites	Parent on file	3,723	5,645	Decision makers
3	Brigham and Women's HospitalBoston · 203 sites	Parent on file	3,175	4,508	Decision makers
4	Harvard Medical Faculty Physicians at Beth Israel Deaconess Medical Center (HMFP)Boston · 147 sites	Parent on file	2,055	2,817	Decision makers
5	Beth Israel Deaconess Medical CenterBoston · 48 sites	Parent on file	1,060	1,334	Decision makers
6	Boston Children's HospitalBoston · 32 sites	Parent on file	982	1,361	Decision makers
7	Harvard Medical Faculty Physicians at Beth Israel Deaconess Medical CenterBoston · 88 sites	Parent on file	939	1,318	Decision makers
8	Binney Medical GroupBoston · 35 sites	Parent on file	768	1,165	Decision makers
9	Boston Medical Center (BMC)Boston · 42 sites	Parent on file	524	738	Decision makers
10	Boston University Medical Group (Boston University Internal Medicine Associates)Boston · 22 sites	Parent on file	474	638	Decision makers
11	Pratt Medical Group, Inc. - General Medical Associates (General Internal Medicine)Boston · 23 sites	Parent on file	264	412	Decision makers
12	Boston Children's Hospital Department of Anesthesiology, Critical Care and Pain MedicineBoston · 11 sites	Parent on file	193	274	Decision makers
13	Pratt Pediatric AssociatesBoston · 12 sites	Parent on file	169	193	Decision makers
14	Boston Medical Center (BMC)Boston · 11 sites	Parent on file	164	192	Decision makers
15	Boston Children's Benderson Family Heart CenterBoston · 6 sites	Parent on file	157	258	Decision makers
16	Pratt Anesthesiology AssociatesBoston · 16 sites	Parent on file	115	202	Decision makers
17	Pratt Radiology AssociatesBoston · 16 sites	Parent on file	99	103	Decision makers
18	Boston Children's Hospital Department of NeurologyBoston · 2 sites	Parent on file	95	149	Decision makers
19	Pratt Neurology AssociatesBoston · 15 sites	Parent on file	93	118	Decision makers
20	Boston University Medical Group (BUMG)Boston · 8 sites	Parent on file	92	137	Decision makers
21	Boston University Department of Family MedicineBoston · 13 sites	Parent on file	92	113	Decision makers
22	Brigham and Women's HospitalBoston · 11 sites	Parent on file	86	243	Decision makers
23	Cardiovascular Center at Tufts Medical CenterBoston · 13 sites	Parent on file	77	156	Decision makers
24	Boston University General SurgeryBoston · 15 sites	Parent on file	75	161	Decision makers
25	Pratt Ob/Gyn AssociatesBoston · 13 sites	-	75	96	Decision makers
26	Department of Radiology at Boston University Medical CenterBoston · 7 sites	Parent on file	70	78	Decision makers
27	New England Baptist HospitalBoston · 14 sites	Parent on file	69	126	Decision makers
28	Pratt AssociatesBoston · 9 sites	Parent on file	66	84	Decision makers
29	Joslin Diabetes CenterBoston · 11 sites	Parent on file	64	118	Decision makers
30	Boston Children's Orthopedics and Sports Medicine DepartmentBoston · 4 sites	Parent on file	64	115	Decision makers
31	Boston Medical Center (BMC)Boston · 6 sites	Parent on file	64	94	Decision makers
32	Commonwealth Radiology AssociatesBoston · 9 sites	-	62	64	Decision makers
33	Pratt Ophthalmology AssociatesBoston · 13 sites	Parent on file	60	82	Decision makers
34	Boston University Medical Group, Department of AnesthesiologyBoston · 4 sites	Parent on file	59	97	Decision makers
35	Boston Children's Hospital Department of RadiologyBoston · 2 sites	Parent on file	58	71	Decision makers
36	Boston University Chobanian & Avedisian School of Medicine Department of PsychiatryBoston · 9 sites	Parent on file	55	223	Decision makers
37	Pratt Surgical AssociatesBoston · 19 sites	Parent on file	52	97	Decision makers
38	Ophthalmic Consultants of BostonBoston · 16 sites	-	49	82	Decision makers
39	Boston Children's HospitalBoston · 6 sites	Parent on file	48	111	Decision makers
40	Boston Health Care for the Homeless ProgramBoston · 14 sites	Parent on file	43	145	Decision makers
41	Boston Children's Hospital, Department of Psychiatry and Behavioral SciencesBoston · 4 sites	Parent on file	43	86	Decision makers
42	Boston University Neurology AssociatesBoston · 6 sites	Parent on file	43	67	Decision makers
43	Ophthalmology at Boston Children's HospitalBoston · 3 sites	Parent on file	40	60	Decision makers
44	Arbour HospitalBoston · 4 sites	Parent on file	35	59	Decision makers
45	Boston Children's Hospital Sports Medicine DivisionBoston · 5 sites	Parent on file	34	78	Decision makers
46	Fenway HealthBoston · 4 sites	Parent on file	32	105	Decision makers
47	Boston Children's Hospital Department of PathologyBoston · 3 sites	Parent on file	32	32	Decision makers
48	Tufts Medical CenterBoston · 4 sites	Parent on file	28	81	Decision makers
49	St. Elizabeth's Medical CenterBoston · 5 sites	Parent on file	28	33	Decision makers
50	Tufts Medical Center New England ArrhythmiaBoston · 5 sites	Parent on file	27	28	Decision makers

Showing 1 to 10 of 158 medical groups in Boston

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

Mass General Brigham has the most physicians in Boston medical groups, with 6,014 across 8 groups

Dmand AI maps every Boston medical group to its parent organization, up to the health system or platform at the top. 10 parent organizations have two or more Boston medical groups. Among health systems, The Children's Hospital has the most groups, 18. Each clinician counts once per parent organization.

Parent organizations with the most Boston medical groups
#	Parent organization	Boston groups	Physicians	HCPs
1	Mass General BrighamHealth system	8	6,014	9,293
2	Beth Israel Lahey HealthHealth system	7	2,332	3,382
3	The Children's HospitalHealth system	18	1,676	2,584
4	Tufts MedicineHealth system	18	1,019	1,503
5	Boston UniversityAcademic health system	11	893	1,497
6	Boston Medical Center Health SystemHealth system	10	797	1,133
7	CaresourceDiversified health company	4	23	127
8	Form HealthPhysician practice platform	4	19	27
9	Fresenius Medical CareTreatment center company	2	-	-
10	Neuroglee HealthPhysician practice platform	2	-	-

Parent organizations with two or more Boston groups

Mass General BrighamHealth system · 8 Boston medical groups
Massachusetts General Physicians Organization (MGPO)Multi-specialty group · 296 sites
Massachusetts General HospitalMulti-specialty group · 124 sites
6 more Boston groups and their practice sites

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Source: Dmand AI Org Hierarchy Data

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30% of Boston medical groups are independent, with no larger parent organization

A group counts as independent when no health system, platform or other organization sits above it in the org hierarchy. Every other group belongs to a larger organization.

Boston medical groups by ownership

Independent4730%
Health system or hospital7849%
Platform or corporate owner2113%
Community or government85%
Other organization43%

Source: Dmand AI Org Hierarchy Data

86 Boston medical groups practice at a hospital site

Beyond their own offices, groups practice at the sites of care linked to them in the org hierarchy. A group can practice at several kinds of site, so the shares overlap.

Boston medical groups by site of care

Hospitals8654%
FQHCs159%
Behavioral health facilities85%
Ambulatory surgery centers53%
Skilled nursing facilities32%
Therapy and rehab centers21%
Home health agencies11%

Sources: Dmand AI Practice Data and Dmand AI Org Hierarchy Data

Primary care groups are the most common medical groups in Boston, with 46

Each group is counted once, under its main specialty. Behavioral and mental health groups are second, with 29, and 48 Boston groups are multi-specialty.

Source: Dmand AI Professional Profile Data

19,630 Massachusetts HCPs work in Boston medical groups, 12,189 of them physicians

Each clinician is counted once, across every Boston group they are linked to. Only clinicians with a Massachusetts address are counted.

HCPs in Boston medical groups by type

Physicians (MD, DO)12,18962%
Nurses and nurse practitioners3,47618%
Physician assistants1,8609%
Behavioral health clinicians1,1386%
Non-clinical and support staff2921%
Other HCPs6753%

Source: Dmand AI Affiliation Data

Each Boston medical group profile shows the parent, sites, clinicians and identifiers

Clinicians and specialtiesA count by specialty and a sample of the group's cliniciansOn every profile
Practice locationsMain site and a sample of practice locations, with a count of the restOn every profile
Medicare Part B paymentsMedicare payments to the group, from CMSOn every profile
Group NPI and Medicare PAC IDIdentifiers for matching records across sourcesOn every profile
Parent organizationThe health system, platform or owner above the groupOn every profile
Every clinician and siteThe full roster and every practice locationWith a free account
Leader and clinician contactsWork emails and mobile numbers, found on request and then validatedWith a free account
EHR used by the group's cliniciansThe EHR in use at the group's sitesWith a free account

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Sources: Doctors and Clinicians National Downloadable File (CMS), Medicare Physician & Other Practitioners (CMS) and Dmand AI Org Hierarchy Data

Sources for the Boston medical group directory

Sources for the data on this page
Data on this page	Source
Medical groups, specialties and sites	Doctors and Clinicians National Downloadable File (CMS) and Dmand AI Professional Profile Data
Parent organizations and independence	Dmand AI Org Hierarchy Data
Physicians and HCPs	Dmand AI Affiliation Data
Group NPI and PAC ID	NPPES NPI Registry (CMS) and Doctors and Clinicians National Downloadable File (CMS)

Data last refreshed October 2026Report an inaccuracy Remove my information

The directory lists groups based in Boston with a Medicare PAC ID.

FAQ

Frequently asked questions about medical groups in Boston

Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.

How many medical groups are in Boston?

There are 158 medical groups based in Boston with a Medicare PAC ID: 48 multi-specialty and 110 single-specialty. 107 of them have more than one site.

What is the largest medical group in Boston?

Massachusetts General Physicians Organization (MGPO), with 3,803 physicians and 5,784 HCPs with a Massachusetts address. Massachusetts General Hospital is second with 3,723, and Brigham and Women's Hospital is third with 3,175.

Which health system has the most medical groups in Boston?

By physicians, Mass General Brigham, with 6,014 across 8 groups, followed by Beth Israel Lahey Health with 2,332 and The Children's Hospital with 1,676.

How many Boston medical groups are independent?

47, or 30%, have no larger parent organization in the Dmand AI org hierarchy. 78 belong to a health system or hospital and 21 to a physician platform or corporate owner.

How many Boston medical groups practice at a hospital?

86 Boston groups practice at a hospital site linked to them in the Dmand AI org hierarchy.

How do I find a medical group's NPI or PAC ID?

Each medical group profile lists the group NPI and Medicare PAC ID at the top, with the main address and phone number. The NPI comes from the NPPES NPI Registry and the PAC ID from CMS Medicare enrollment.

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