Updated October 2026

Medical groups in Maryland

Medical group directory
Maryland

Medical groups: 2,568
Multi-specialty: 483
Single-specialty: 2,085
More than one site: 1,224
100+ physicians: 42

There are 2,568 medical groups in Maryland with a Medicare PAC ID. Johns Hopkins University is the largest, with 2,516 Maryland physicians. University of Maryland Medical System has the most physicians across its groups, 2,239, and 70% of Maryland groups are independent.

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Johns Hopkins University is the largest medical group in Maryland, with 2,516 physicians

Ranked by physicians with a Maryland address linked to each group. Mid-Atlantic Permanente Medical Group is second with 1,404, and Johns Hopkins Department of Orthopaedic Surgery third with 860. 42 Maryland groups have 100 or more physicians.

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Medical groups in Maryland, ranked by physicians
#	Medical group	Parent organization	Physicians	HCPs	Decision makers
1	Johns Hopkins UniversityBaltimore · 217 sites	Parent on file	2,516	3,680	Decision makers
2	Mid-Atlantic Permanente Medical GroupLargo · 179 sites	Parent on file	1,404	1,826	Decision makers
3	Johns Hopkins Department of Orthopaedic SurgeryMiddle River · 74 sites	Parent on file	860	1,106	Decision makers
4	Johns Hopkins Community PhysiciansMiddle River · 107 sites	Parent on file	595	934	Decision makers
5	Johns Hopkins MedicineBaltimore · 75 sites	Parent on file	481	692	Decision makers
6	Sinai Rehab Pain Medicine AssociatesBaltimore · 48 sites	Parent on file	452	734	Decision makers
7	Luminis Health Maternal and Fetal Medicine AnnapolisAnnapolis · 87 sites	Parent on file	447	827	Decision makers
8	UM Community Medical GroupLinthicum · 87 sites	Parent on file	439	794	Decision makers
9	University of Maryland Medical Center Gastroenterology and HepatologyBaltimore · 43 sites	Parent on file	385	560	Decision makers
10	Agape Physical TherapyForest Hill · 84 sites	Parent on file	344	568	Decision makers
11	Meritus RadiologyHagerstown · 62 sites	Parent on file	332	567	Decision makers
12	Greater Baltimore Medical Center (GBMC)Baltimore · 47 sites	Parent on file	305	530	Decision makers
13	TidalHealth Cardiovascular SurgerySalisbury · 34 sites	Parent on file	277	462	Decision makers
14	Integrated Specialists GroupHalethorpe · 29 sites	Parent on file	272	435	Decision makers
15	UM St. Joseph Medical GroupTowson · 45 sites	Parent on file	267	485	Decision makers
16	Mercy Personal Physicians DowntownBaltimore · 86 sites	Parent on file	257	472	Decision makers
17	Anesthesia Company, LLCAnnapolis · 61 sites	Parent on file	251	431	Decision makers
18	US Anesthesia PartnersColumbia · 77 sites	Parent on file	224	533	Decision makers
19	Capital Women's CareFulton · 69 sites	Parent on file	200	316	Decision makers
20	Amber Hill Therapy CentersFrederick · 45 sites	-	184	293	Decision makers
21	R Adams Cowley Shock Trauma Center at the University of MarylandBaltimore · 17 sites	Parent on file	180	419	Decision makers
22	The Centers for Advanced OrthopaedicsBethesda · 126 sites	-	174	711	Decision makers
23	Lutherville PediatricsLutherville · 63 sites	Parent on file	163	281	Decision makers
24	MedStar Shah Medical GroupHollywood · 40 sites	Parent on file	163	214	Decision makers
25	PGHC Anesthesia AssociatesUpper Marlboro · 45 sites	Parent on file	150	285	Decision makers
26	Adventist Medical GroupGaithersburg · 39 sites	Parent on file	144	230	Decision makers
27	Baltimore Medical SystemBaltimore · 23 sites	Parent on file	142	219	Decision makers
28	Kennedy Krieger InstituteBaltimore · 21 sites	Parent on file	141	321	Decision makers
29	Mercy Family Care PhysiciansBaltimore · 31 sites	Parent on file	140	308	Decision makers
30	Chesapeake Urology AssociatesOwings Mills · 41 sites	Parent on file	140	200	Decision makers
31	North American Partners in Anesthesia (NAPA)Prince Frederick · 45 sites	Parent on file	138	377	Decision makers
32	Meritus Robinwood OrthopedicsHagerstown · 18 sites	Parent on file	138	237	Decision makers
33	Frederick Health Medical GroupFrederick · 30 sites	Parent on file	133	225	Decision makers
34	Frederick Health Medical GroupFrederick · 26 sites	Parent on file	126	272	Decision makers
35	University of Maryland Emergency MedicineBaltimore · 6 sites	Parent on file	123	194	Decision makers
36	Northwest Hospitalist GroupRandallstown · 2 sites	Parent on file	122	229	Decision makers
37	Advanced RadiologyOwings Mills · 109 sites	Parent on file	118	124	Decision makers
38	ChristianaCare Union HospitalElkton · 37 sites	Parent on file	117	181	Decision makers
39	UPMC Western Maryland Obstetrics and GynecologyCumberland · 18 sites	Parent on file	112	210	Decision makers
40	University of Maryland Pediatric AssociatesBaltimore · 14 sites	Parent on file	112	169	Decision makers
41	Johns Hopkins MedicineBaltimore · 15 sites	Parent on file	110	123	Decision makers
42	University of Maryland Shore Medical Center at ChestertownChestertown · 1 site	Parent on file	109	126	Decision makers
43	University of MD Anesthesiology Associates PABaltimore · 16 sites	Parent on file	96	223	Decision makers
44	Capital Digestive CareSilver Spring · 58 sites	-	95	157	Decision makers
45	Professional Services of Holy CrossSilver Spring · 33 sites	Parent on file	94	194	Decision makers
46	University of Maryland Surgical CareBaltimore · 17 sites	Parent on file	88	169	Decision makers
47	Upper Chesapeake Emergency PhysiciansBel Air · 13 sites	Parent on file	83	108	Decision makers
48	University of Maryland Diagnostic Imaging SpecialistsBaltimore · 48 sites	Parent on file	83	84	Decision makers
49	Sheppard PrattBaltimore · 6 sites	Parent on file	81	178	Decision makers
50	TidalHealth AtlanticBerlin · 22 sites	Parent on file	80	129	Decision makers

Showing 1 to 10 of 2,568 medical groups in Maryland

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

University of Maryland Medical System has the most physicians in Maryland medical groups, with 2,239 across 50 groups

Dmand AI maps every medical group to its parent organization, up to the health system or platform at the top. 85 parent organizations have two or more Maryland medical groups. Each clinician counts once per parent organization.

Parent organizations with the most Maryland medical groups
#	Parent organization	Maryland groups	Physicians	HCPs
1	University of Maryland Medical SystemHealth system	50	2,239	4,006
2	Johns Hopkins Health SystemAcademic health system	10	1,770	2,538
3	LifeBridge HealthHealth system	22	774	1,398
4	Luminis HealthHealth system	18	625	1,329
5	Meritus HealthHealth system	8	430	782
6	Mercy Medical CenterHealth system	8	423	767
7	GBMC HealthCareHealth system	6	356	640
8	TidalHealth Peninsula RegionalHealth system	9	349	616
9	U.S. Physical TherapyPhysician practice platform	2	344	576
10	Ascension Health AllianceHealth system	4	315	551

Top 10 of 85 parent organizations with two or more Maryland groups

University of Maryland Medical SystemHealth system · 50 Maryland medical groups
UM Community Medical GroupMulti-specialty group · Linthicum
University of Maryland Medical Center Gastroenterology and HepatologyMedical group · Baltimore
48 more Maryland groups and their practice sites

See every medical group, site and clinician under University of Maryland Medical System

Org Hierarchy Explorer maps every group, site of care and clinician under the parent, with the leaders at each group.

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Source: Dmand AI Org Hierarchy Data

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Dmand AI maps the owners, administrators and physician leaders at each of the 2,568 Maryland medical groups, with the parent organization above each one, and finds validated work emails and mobile numbers.

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70% of Maryland 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.

Maryland medical groups by ownership

Independent1,80170%
Health system or hospital2098%
Platform or corporate owner2269%
Community or government1335%
Other organization1998%

Source: Dmand AI Org Hierarchy Data

314 Maryland 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.

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

Primary care groups are the most common medical groups in Maryland, with 1,051

Each group is counted once, under its main specialty. Behavioral and mental health groups are second, with 501, and 483 Maryland groups are multi-specialty.

Source: Dmand AI Professional Profile Data

32,496 Maryland HCPs work in Maryland medical groups, 14,174 of them physicians

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

HCPs in Maryland medical groups by type

Physicians (MD, DO)14,17444%
Nurses and nurse practitioners7,12022%
Behavioral health clinicians4,12113%
Physician assistants2,6148%
Therapists (PT and OT)2,5008%
Other HCPs1,9676%

Source: Dmand AI Affiliation Data

Baltimore has the most medical groups in Maryland, with 305

305medical groups in Baltimore 116medical groups in Rockville 99medical groups in Frederick 88medical groups in Columbia 86medical groups in Silver Spring 75medical groups in Annapolis

More Maryland cities with medical groups

Source: Doctors and Clinicians National Downloadable File (CMS)

Each Maryland 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 Maryland 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 with a Medicare PAC ID.

FAQ

Frequently asked questions about medical groups in Maryland

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 Maryland?

There are 2,568 medical groups in Maryland with a Medicare PAC ID: 483 multi-specialty and 2,085 single-specialty.

What is the largest medical group in Maryland?

Johns Hopkins University in Baltimore, with 2,516 physicians and 3,680 HCPs with a Maryland address. Mid-Atlantic Permanente Medical Group is second with 1,404, and Johns Hopkins Department of Orthopaedic Surgery is third with 860.

Which health system has the most medical groups in Maryland?

By physicians, University of Maryland Medical System, with 2,239 across 50 groups, followed by Johns Hopkins Health System with 1,770 and LifeBridge Health with 774.

How many Maryland medical groups are independent?

1,801, or 70%, have no larger parent organization in the Dmand AI org hierarchy. 209 belong to a health system or hospital and 226 to a physician platform or corporate owner.

How many Maryland medical groups practice at a hospital?

314 Maryland 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.

How do I find decision makers at Maryland medical groups?

Open a group's profile for its parent organization and leaders, then get work emails and mobile numbers through Dmand AI's healthcare waterfall enrichment. 30 days free, self-serve, no credit card.

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