Largest primary care groups in California
- Groups
- 3,969
- Internal Medicine groups
- 1,835
- Family Medicine groups
- 1,169
- Internal medicine specialists
- 22,438
- Family physicians
- 4,605
There are 3,969 primary care groups in California with a Medicare PAC ID: 1,835 internal medicine, 1,169 family medicine, 619 nurse practitioner, 207 physician assistant and 138 general practice. The Permanente Medical Group, Inc. is the largest internal medicine group, with 3,018 internal medicine specialists, and MemorialCare Medical Group the largest family medicine group, with 247 family physicians.
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The Permanente Medical Group, Inc. is the largest primary care group in California, with 11,708 physicians
Ranked by physicians with a California address linked to each group. Southern California Permanente Medical Group is second with 11,175, and UCSF Pediatrics third with 3,527. 119 California groups have 100 or more physicians.
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Showing 1 to 10 of 3,969 primary care groups in California
Sources: Doctors and Clinicians National Downloadable File (CMS) and Dmand AI Affiliation Data
The Permanente Medical Group, Inc. is the largest internal medicine group in California, with 3,018 internal medicine specialists
Ranked by internal medicine specialists with a California address linked to each group whose main sub-specialty is internal medicine. Southern California Permanente Medical Group is second with 2,680, and UCLA Medical Group third with 947.
Sources: Doctors and Clinicians National Downloadable File (CMS) and Dmand AI Affiliation Data
MemorialCare Medical Group is the largest family medicine group in California, with 247 family physicians
Ranked by family physicians with a California address linked to each group whose main sub-specialty is family medicine. Ventura County Medical Center is second with 154, and San Ysidro Health third with 150.
Sources: Doctors and Clinicians National Downloadable File (CMS) and Dmand AI Affiliation Data
Nightingale Clinical Care is the largest nurse practitioner group in California, with 70 nurse practitioner specialists
Ranked by nurse practitioner specialists with a California address linked to each group whose main sub-specialty is nurse practitioner. MyndFull Care is second with 64, and CVS MinuteClinic third with 64.
Sources: Doctors and Clinicians National Downloadable File (CMS) and Dmand AI Affiliation Data
Healthcare Service Partners (HSP) is the largest physician assistant group in California, with 15 physician assistant specialists
Ranked by physician assistant specialists with a California address linked to each group whose main sub-specialty is physician assistant. Urgent Care Now is second with 13, and Mint Health Solutions, Inc. third with 13.
Sources: Doctors and Clinicians National Downloadable File (CMS) and Dmand AI Affiliation Data
Signify Health is the largest general practice group in California, with 29 general practice specialists
Ranked by general practice specialists with a California address linked to each group whose main sub-specialty is general practice. Skilled Physicians Group is second with 10, and Allmed of Los Angeles third with 3.
Sources: Doctors and Clinicians National Downloadable File (CMS) and Dmand AI Affiliation Data
Kaiser Permanente has the most physicians in California primary care groups, with 22,694 across 4 groups
Dmand AI maps every medical group to its parent organization, up to the health system or platform at the top. 131 parent organizations have two or more California primary care groups. Among health systems, Providence Health & Services has the most groups, 27. Each clinician counts once per parent organization.
See every medical group, site and clinician under Kaiser Permanente
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 3,969 California primary care groups, with the parent organization above each one, and finds validated work emails and mobile numbers.
67% of California 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.
California primary care groups by ownership
- Independent2,656
- Health system or hospital319
- Platform or corporate owner360
- Community or government190
- Other organization444
Sites of care beyond their own offices
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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
598 California primary care groups practice at a hospital site, and 197 at an FQHC
Sites of care linked to each group in the org hierarchy, beyond its own offices. A group can practice at several kinds of site.
California primary care groups by site of care
- Hospitals598
- FQHCs197
- Skilled nursing facilities87
- Rural health clinics68
- Ambulatory surgery centers67
- Hospices39
- Behavioral health facilities25
- Dialysis centers23
- Therapy and rehab centers12
- Home health agencies11
Clinicians in California primary care groups
Sources: Dmand AI Practice Data and Dmand AI Org Hierarchy Data
Los Angeles has the most primary care groups in California, with 251
More California cities with primary care groups
- Orange54
- San Jose49
- Riverside48
- Sacramento47
- Long Beach45
- Santa Ana45
- Torrance45
- Burbank43
- Newport Beach43
- Anaheim42
- Beverly Hills39
- Chula Vista39
- Corona38
- Visalia36
- Irvine32
Source: Doctors and Clinicians National Downloadable File (CMS)
Each California 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 California 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 primary care groups in California
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 California?
The Permanente Medical Group, Inc., based in Pleasanton, with 3,018 internal medicine specialists and 21,035 HCPs. Southern California Permanente Medical Group is second with 2,680.
What is the largest family medicine group in California?
MemorialCare Medical Group, based in Fountain Valley, with 247 family physicians and 963 HCPs. Ventura County Medical Center is second with 154.
How many primary care groups are in California?
There are 3,969 primary care groups in California with a Medicare PAC ID: 1,835 internal medicine, 1,169 family medicine, 619 nurse practitioner, 207 physician assistant and 138 general practice. Between them they have 22,438 internal medicine specialists, 4,605 family physicians, 1,717 nurse practitioner specialists, 536 physician assistant specialists and 102 general practice specialists.
Which companies own the most primary care groups?
By physicians, Kaiser Permanente, with 22,694 across 4 groups, followed by University of California Health with 8,238 and Sutter Health with 3,685.
How many California primary care groups are independent?
2,656, or 67%, have no larger parent organization in the Dmand AI org hierarchy. 319 belong to a health system or hospital and 360 to a physician platform or corporate owner.
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