Medical groups in the United States
- Medical groups
- 114,975
- Multi-specialty
- 22,707
- Single-specialty
- 92,257
- More than one site
- 55,810
- 100+ physicians
- 3,247
There are 114,975 medical groups in the US with a Medicare PAC ID. The Permanente Medical Group, Inc. is the largest, with 12,229 physicians. UnitedHealth Group has the most physicians across its groups, 16,642, and 71% of US groups are independent.
Find the decision makers at 114,975 US medical groups
Work emails and mobile numbers for practice owners, administrators and physician leaders, found through healthcare waterfall enrichment, with a free Dmand AI account.
The Permanente Medical Group, Inc. is the largest medical group in the US, with 12,229 physicians
Ranked by physicians linked to each group. Southern California Permanente Medical Group is second with 11,438, and Northwell Health Physician Partners Cardiology at Great Neck third with 6,536. 3,247 US groups have 100 or more physicians.
Sources: Doctors and Clinicians National Downloadable File (CMS) and Dmand AI Affiliation Data
California has the most medical groups, with 10,378
Florida is second with 10,009 and Texas third with 9,540. The list covers the 50 states, Washington, DC and the US territories, largest first.
- California10,378
- Florida10,009
- Texas9,540
- New York7,300
- Michigan4,724
- New Jersey4,262
- Illinois4,250
- Pennsylvania3,715
- Georgia3,453
- Ohio3,351
- North Carolina2,951
- Tennessee2,763
- Arizona2,647
- Virginia2,577
- Maryland2,568
- Massachusetts2,293
- Louisiana2,239
- Alabama2,161
- Colorado2,039
- Washington1,953
- Indiana1,709
- Minnesota1,683
- Missouri1,682
- Kentucky1,559
- Wisconsin1,501
- South Carolina1,464
- Oklahoma1,434
- Nevada1,410
- Oregon1,341
- Connecticut1,291
- Arkansas1,206
- Mississippi1,130
- Kansas1,128
- Iowa1,081
- Utah1,036
- Idaho961
- Nebraska908
- Puerto Rico780
- New Mexico754
- Hawaii616
- West Virginia593
- Montana559
- Delaware494
- Alaska455
- Maine424
- Rhode Island415
- New Hampshire414
- North Dakota406
- South Dakota394
- Wyoming359
- Vermont248
- Washington, DC171
- U.S. Virgin Islands45
- Guam31
- Northern Mariana Islands9
- American Samoa2
Source: Doctors and Clinicians National Downloadable File (CMS)
UnitedHealth Group has the most physicians in US medical groups, with 16,642 across 625 groups
3,062 parent organizations have two or more US medical groups. Among health systems, HCA Healthcare has the most groups, 352. Each clinician counts once per parent organization.
See every medical group, site and clinician under UnitedHealth Group
Org Hierarchy Explorer maps every group, site of care and clinician under the parent, with the leaders at each group.
Source: Dmand AI Org Hierarchy Data
For sales teams
Dmand AI maps the owners, administrators and physician leaders at each of the 114,975 US medical groups, with the parent organization above each one, and finds validated work emails and mobile numbers.
71% of US 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.
US medical groups by ownership
- Independent81,938
- Health system or hospital9,947
- Platform or corporate owner10,540
- Community or government5,503
- Other organization7,047
Source: Dmand AI Org Hierarchy Data
18,545 US 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.
US medical groups by site of care
- Hospitals18,545
- Behavioral health facilities3,581
- Ambulatory surgery centers3,463
- Therapy and rehab centers3,270
- FQHCs3,044
- Rural health clinics2,566
- Skilled nursing facilities2,546
- Hospices615
- Dialysis centers412
- Home health agencies315
Sources: Dmand AI Practice Data and Dmand AI Org Hierarchy Data
Primary care groups are the most common medical groups in the US, with 39,592
Each group is counted once, under its main specialty. Behavioral and mental health groups are second, with 17,743, and 22,707 US groups are multi-specialty.
- Primary care39,592
- Behavioral and mental health17,743
- Rehabilitation and therapy12,238
- Eye care10,687
- Chiropractic8,646
- Anesthesia and pain4,955
- Radiology and imaging2,687
- Emergency and hospital medicine2,612
- Podiatry2,502
- Dermatology2,373
- OB/GYN and women's health2,110
- ENT and audiology1,990
- Orthopedics and sports medicine1,495
- General and specialty surgery1,195
- Pathology and laboratory969
- Pediatrics782
- Dental and oral surgery610
- Plastic and cosmetic surgery463
- Urology and nephrology402
- Rheumatology, allergy and immunology373
- Neurology and neurosurgery330
- Cardiology131
- Gastroenterology75
- Other specialties14
- Nutrition and dietetics1
Source: Dmand AI Professional Profile Data
2,022,726 HCPs work in US medical groups, 852,471 of them physicians
Each clinician is counted once, across every US group they are linked to.
HCPs in US medical groups by type
- Physicians (MD, DO)852,471
- Nurses and nurse practitioners432,925
- Behavioral health clinicians254,615
- Physician assistants174,018
- Therapists (PT and OT)141,846
- Other HCPs166,851
Source: Dmand AI Affiliation Data
Each US 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
Free account: 30 days free, self-serve, no credit card.
Sources: Doctors and Clinicians National Downloadable File (CMS), Medicare Physician & Other Practitioners (CMS) and Dmand AI Org Hierarchy Data
Sources for the US medical group directory
| 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 inaccuracyRemove my information
The directory lists groups with a Medicare PAC ID.
FAQ
Frequently asked questions about US medical groups
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 the US?
There are 114,975 medical groups in the US with a Medicare PAC ID: 22,707 multi-specialty and 92,257 single-specialty.
What is a medical group, and is it the same as a physician group?
Yes. A medical group, or physician group, is a practice whose clinicians bill together under one group NPI and, for Medicare, one PAC ID. It can be owned by its physicians, a health system, a physician platform or another company.
What is the largest medical group in the US?
The Permanente Medical Group, Inc. in Pleasanton, with 12,229 physicians and 21,772 HCPs linked in Dmand AI data. Southern California Permanente Medical Group is second with 11,438.
Which company owns the most medical groups?
By physicians, UnitedHealth Group, with 16,642 across 625 groups, followed by HCA Healthcare with 13,072 and Trinity Health with 12,630.
How many medical groups are independent?
81,938, or 71%, have no larger parent organization in the Dmand AI org hierarchy. 9,947 belong to a health system or hospital and 10,540 to a physician platform or corporate owner.
What is a multispecialty medical group?
A group whose clinicians practice in more than one specialty, often primary care alongside specialists. 22,707 US medical groups are multi-specialty, and 92,257 are single-specialty.
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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