Largest primary care groups in the US
- Groups
- 39,592
- Internal Medicine groups
- 15,745
- Nurse Practitioner groups
- 10,763
- Internal medicine specialists
- 204,077
- Nurse practitioner specialists
- 40,034
There are 39,592 primary care groups in the US with a Medicare PAC ID: 15,745 internal medicine, 10,763 nurse practitioner, 10,346 family medicine, 1,715 physician assistant, 961 general practice, 54 clinical nurse specialist and 8 preventive medicine. The Permanente Medical Group, Inc. is the largest internal medicine group, with 3,128 internal medicine specialists, and The Little Clinic the largest nurse practitioner group, with 539 nurse practitioner specialists.
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The Permanente Medical Group, Inc. is the largest internal medicine group in the US, with 3,128 internal medicine specialists
Ranked by internal medicine specialists linked to each group whose main sub-specialty is internal medicine. Southern California Permanente Medical Group is second with 2,735, and Northwell Health Physician Partners Cardiology at Great Neck third with 1,951.
Sources: Doctors and Clinicians National Downloadable File (CMS) and Dmand AI Affiliation Data
The Little Clinic is the largest nurse practitioner group in the US, with 539 nurse practitioner specialists
Ranked by nurse practitioner specialists linked to each group whose main sub-specialty is nurse practitioner. First Care Clinics is second with 389, and Matrix Medical Network third with 377.
Sources: Doctors and Clinicians National Downloadable File (CMS) and Dmand AI Affiliation Data
Phoenix Physical Therapy is the largest family medicine group in the US, with 634 family physicians
Ranked by family physicians linked to each group whose main sub-specialty is family medicine. Concord Medical Group is second with 613, and Washington Permanente Medical Group, P.C. third with 541.
Sources: Doctors and Clinicians National Downloadable File (CMS) and Dmand AI Affiliation Data
Emergency Coverage Services, PC is the largest physician assistant group in the US, with 311 physician assistant specialists
Ranked by physician assistant specialists linked to each group whose main sub-specialty is physician assistant. Northwest Physician Associates is second with 156, and Southeastern Emergency Services third with 128.
Sources: Doctors and Clinicians National Downloadable File (CMS) and Dmand AI Affiliation Data
Signify Health is the largest general practice group in the US, with 228 general practice specialists
Ranked by general practice specialists linked to each group whose main sub-specialty is general practice. HIMA San Pablo Caguas Hospital is second with 173, and Centro de Salud Integral en Corozal third with 112.
Sources: Doctors and Clinicians National Downloadable File (CMS) and Dmand AI Affiliation Data
ATX Primary Care is the largest clinical nurse specialist group in the US, with 5 clinical nurse specialist specialists
Ranked by clinical nurse specialist specialists linked to each group whose main sub-specialty is clinical nurse specialist. Delaware Psychiatry LLC is second with 2, and Harrison & Feldhausen, P.C. third with 2. Nine of the ten are independent.
Sources: Doctors and Clinicians National Downloadable File (CMS) and Dmand AI Affiliation Data
Hyperbaric Physicians of Georgia is the largest preventive medicine group in the US, with 5 preventive medicine specialists
Ranked by preventive medicine specialists linked to each group whose main sub-specialty is preventive medicine. Pinnacle Health Care is second with 4, and Hyperbaric Physicians of Georgia third with 3.
Sources: Doctors and Clinicians National Downloadable File (CMS) and Dmand AI Affiliation Data
Florida has the most primary care groups, with 4,416
Texas is second with 4,000 and California third with 3,969. Every state with 5 or more groups has its own list.
- Florida4,416
- Texas4,000
- California3,969
- New York2,279
- Michigan1,521
- Georgia1,394
- New Jersey1,307
- Illinois1,232
- Tennessee1,216
- Arizona1,130
- Maryland1,051
- Pennsylvania991
- North Carolina959
- Ohio946
- Alabama925
- Louisiana903
- Virginia831
- Massachusetts677
- Nevada602
- Oklahoma587
- Colorado575
- Kentucky536
- Missouri487
- Mississippi485
- Indiana474
- Washington463
- South Carolina448
- Arkansas416
- Puerto Rico356
- Kansas349
- Connecticut344
- Oregon312
- Utah311
- Idaho262
- Nebraska258
- New Mexico247
- Minnesota239
- Wisconsin234
- West Virginia227
- Iowa213
- Delaware201
- Hawaii188
- Rhode Island133
- Montana125
- Alaska120
- Maine103
- New Hampshire98
- North Dakota83
- Wyoming82
- South Dakota77
- Washington, DC61
- Vermont54
- U.S. Virgin Islands19
- Guam16
- Northern Mariana Islands5
- American Samoa2
Source: Doctors and Clinicians National Downloadable File (CMS)
UnitedHealth Group has the most physicians in US primary care groups, with 14,783 across 464 groups
1,517 parent organizations have two or more US primary care groups. Among health systems, Trinity Health has the most groups, 217. 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
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Dmand AI maps the owners, administrators and physician leaders at each of the 39,592 US primary care groups, with the parent organization above each one, and finds validated work emails and mobile numbers.
63% of US primary care 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 primary care groups by ownership
- Independent25,040
- Health system or hospital5,415
- Platform or corporate owner3,623
- Community or government1,672
- Other organization3,842
Sites of care beyond their own offices
See the parent organization above every US group
Dmand AI maps each group to the health system, physician platform or management company above it, so you can sell to the owner, not one site.
Source: Dmand AI Org Hierarchy Data
Each US primary care 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 primary care group list
| 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
Groups whose main specialty is primary care and that have a Medicare PAC ID.
FAQ
Frequently asked questions about US primary care groups
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is the largest internal medicine group in the US?
The Permanente Medical Group, Inc., based in Pleasanton, California, with 3,128 internal medicine specialists and 21,772 HCPs. Southern California Permanente Medical Group is second with 2,735.
What is the largest nurse practitioner group in the US?
The Little Clinic, based in Cincinnati, Ohio, with 539 nurse practitioner specialists and 546 HCPs. First Care Clinics is second with 389.
How many primary care groups are in the US?
There are 39,592 primary care groups in the US with a Medicare PAC ID: 15,745 internal medicine, 10,763 nurse practitioner, 10,346 family medicine, 1,715 physician assistant, 961 general practice, 54 clinical nurse specialist and 8 preventive medicine. Between them they have 204,077 internal medicine specialists, 40,034 nurse practitioner specialists, 52,424 family physicians, 6,160 physician assistant specialists, 2,593 general practice specialists, 44 clinical nurse specialist specialists and 12 preventive medicine specialists.
Which state has the most primary care groups?
Florida, with 4,416, followed by Texas with 4,000 and California with 3,969.
Which companies own the most primary care groups?
By physicians, UnitedHealth Group, with 14,783 across 464 groups, followed by Trinity Health with 10,279 and HCA Healthcare with 5,938.
How many primary care groups are independent?
25,040, or 63%, have no larger parent organization in the Dmand AI org hierarchy. 5,415 belong to a health system or hospital and 3,623 to a physician platform or corporate owner.
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