Updated October 2026

Medical groups in California

Medical group directory
California

Medical groups: 10,378
Multi-specialty: 2,304
Single-specialty: 8,073
More than one site: 4,683
100+ physicians: 219

There are 10,378 medical groups in California with a Medicare PAC ID. The Permanente Medical Group, Inc. is the largest, with 11,708 California physicians. Kaiser Permanente has the most physicians across its groups, 22,698, and 73% of California groups are independent.

Find the decision makers at all 10,378 California 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.

View contacts for free

The Permanente Medical Group, Inc. is the largest medical 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. 219 California groups have 100 or more physicians.

Filter this list with a free account

Sort and filter all 10,378 California medical groups by specialty, city, parent organization, group size, EHR in use and decision makers in Dmand AI.

Filter in Dmand AI

Medical groups in California, ranked by physicians
#	Medical group	Parent organization	Physicians	HCPs	Decision makers
1	The Permanente Medical Group, Inc.Pleasanton · 1,324 sites	Parent on file	11,708	21,035	Decision makers
2	Southern California Permanente Medical GroupPasaden · 1,141 sites	Parent on file	11,175	19,125	Decision makers
3	UCSF PediatricsSan Francisco · 125 sites	Parent on file	3,527	5,326	Decision makers
4	UCSF Medical GroupSan Francisco · 278 sites	Parent on file	3,444	5,191	Decision makers
5	Palo Alto Foundation Medical GroupPalo Alto · 373 sites	Parent on file	3,305	4,909	Decision makers
6	Stanford Health CareStanford · 66 sites	Parent on file	3,139	4,715	Decision makers
7	Lucile Packard Children's Hospital StanfordPalo Alto · 61 sites	Parent on file	2,688	4,028	Decision makers
8	VituityModesto · 320 sites	Parent on file	2,155	4,058	Decision makers
9	UC San Diego HealthLos Angeles · 180 sites	Parent on file	2,139	3,019	Decision makers
10	UC Davis Medical GroupRancho Cordova · 216 sites	Parent on file	1,865	2,564	Decision makers
11	County of Santa Clara Behavioral Health Services, Las Plumas Behavioral Health ClinicSan Jose · 59 sites	Parent on file	1,794	2,238	Decision makers
12	Loma Linda University Faculty Medical Group (LLUFMG)Los Angeles · 160 sites	Parent on file	1,723	2,467	Decision makers
13	Cedars-Sinai Medical GroupLos Angeles · 144 sites	Parent on file	1,699	2,191	Decision makers
14	Harbor-UCLA Medical CenterTorrance · 74 sites	Parent on file	1,690	2,175	Decision makers
15	UCSF Department of Radiology & Biomedical ImagingSan Francisco · 116 sites	Parent on file	1,588	1,830	Decision makers
16	USC Care Medical GroupLos Angeles · 129 sites	Parent on file	1,551	2,402	Decision makers
17	UCSF PediatricsSan Francisco · 103 sites	Parent on file	1,549	2,276	Decision makers
18	UCLA Medical GroupLos Angeles · 128 sites	Parent on file	1,535	1,858	Decision makers
19	Optum - Downtown Los AngelesLos Angeles · 241 sites	Parent on file	1,499	2,238	Decision makers
20	St. Jude Heritage Medical GroupBrea · 177 sites	Parent on file	1,263	1,896	Decision makers
21	Emergency and Acute Care Medical CorporationSan Diego · 124 sites	-	1,231	1,355	Decision makers
22	Scripps Clinic Medical GroupSan Diego · 91 sites	Parent on file	1,161	1,804	Decision makers
23	UCSF Division of General Internal MedicineSan Francisco · 108 sites	Parent on file	1,150	2,084	Decision makers
24	Mercy Medical GroupSacramento · 129 sites	Parent on file	1,055	1,459	Decision makers
25	Children's Hospital Los Angeles Medical GroupLos Angeles · 21 sites	Parent on file	1,054	1,252	Decision makers
26	San Francisco Public Health LaboratorySan Francisco · 128 sites	Parent on file	1,029	2,008	Decision makers
27	Inpatient Specialist of California PCSan Bernardino · 103 sites	Parent on file	962	1,031	Decision makers
28	City of HopeDuarte · 66 sites	Parent on file	901	1,331	Decision makers
29	Sharp Rees-Stealy Medical GroupSan Diego · 76 sites	Parent on file	875	1,319	Decision makers
30	VituityModesto · 171 sites	Parent on file	789	879	Decision makers
31	Cedars-Sinai Medical CenterWest Hollywood · 19 sites	Parent on file	740	1,123	Decision makers
32	MemorialCare Medical GroupFountain Valley · 80 sites	Parent on file	727	963	Decision makers
33	UC Davis Medical GroupRancho Cordova · 62 sites	Parent on file	716	956	Decision makers
34	Sound PhysiciansSan Jose · 78 sites	Parent on file	710	758	Decision makers
35	John Muir HealthWalnut Creek · 50 sites	Parent on file	703	742	Decision makers
36	Alameda Health SystemOakland · 26 sites	Parent on file	668	974	Decision makers
37	Rady Children's Specialists of San DiegoSan Diego · 57 sites	Parent on file	661	890	Decision makers
38	PIH Health PhysiciansWhittier · 76 sites	Parent on file	631	916	Decision makers
39	Adventist Health Physicians NetworkHanford · 213 sites	Parent on file	622	990	Decision makers
40	CEP AmericaEmeryville · 136 sites	Parent on file	616	724	Decision makers
41	John Muir Medical GroupWalnut Creek · 60 sites	Parent on file	558	712	Decision makers
42	Facey Medical GroupLos Angeles · 65 sites	Parent on file	513	741	Decision makers
43	Family Health Centers of San DiegoSan Diego · 80 sites	Parent on file	510	1,100	Decision makers
44	Valley Children's Medical GroupMadera · 24 sites	Parent on file	483	516	Decision makers
45	Coalinga State HospitalSacramento · 9 sites	Parent on file	461	695	Decision makers
46	Ventura County Medical CenterVentura · 47 sites	Parent on file	457	699	Decision makers
47	San Mateo Medical CenterSan Mateo · 35 sites	Parent on file	457	692	Decision makers
48	Beaver Medical GroupRedlands · 43 sites	Parent on file	457	652	Decision makers
49	Eisenhower HealthRancho Mirage · 27 sites	Parent on file	439	609	Decision makers
50	West County Adult Mental Health ServicesMartinez · 26 sites	Parent on file	413	682	Decision makers

Showing 1 to 10 of 10,378 medical groups in California

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

Kaiser Permanente has the most physicians in California medical groups, with 22,698 across 8 groups

Dmand AI maps every medical group to its parent organization, up to the health system or platform at the top. 297 parent organizations have two or more California medical groups. Among health systems, University of California Health has the most groups, 66. Each clinician counts once per parent organization.

Parent organizations with the most California medical groups
#	Parent organization	California groups	Physicians	HCPs
1	Kaiser PermanenteDiversified health company	8	22,698	39,886
2	University of California HealthAcademic health system	66	10,033	14,377
3	VituityPhysician staffing company	49	4,133	6,393
4	Stanford UniversityAcademic health system	3	3,817	5,733
5	Sutter HealthHealth system	19	3,710	5,591
6	UnitedHealth GroupDiversified health company	126	3,123	4,210
7	Cedars-Sinai Health SystemHealth system	23	2,719	3,714
8	Providence Health & ServicesHealth system	58	2,565	3,776
9	County of Los AngelesLocal government	18	2,317	3,431
10	University of California HealthHealth system	3	2,141	2,992

Top 10 of 297 parent organizations with two or more California groups

Kaiser PermanenteDiversified health company · 8 California medical groups
The Permanente Medical Group, Inc.Multi-specialty group · Pleasanton
Southern California Permanente Medical GroupMulti-specialty group · Pasaden
6 more California groups and their practice sites

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.

Try for free

Source: Dmand AI Org Hierarchy Data

For sales teams

Find the decision makers at California medical groups

Dmand AI maps the owners, administrators and physician leaders at each of the 10,378 California medical groups, with the parent organization above each one, and finds validated work emails and mobile numbers.

Try for free Book a meeting

73% of California 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.

California medical groups by ownership

Independent7,61073%
Health system or hospital6676%
Platform or corporate owner8738%
Community or government4464%
Other organization7828%

Source: Dmand AI Org Hierarchy Data

1,631 California 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 California, with 3,969

Each group is counted once, under its main specialty. Behavioral and mental health groups are second, with 1,129, and 2,304 California groups are multi-specialty.

Source: Dmand AI Professional Profile Data

188,517 California HCPs work in California medical groups, 95,666 of them physicians

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

HCPs in California medical groups by type

Physicians (MD, DO)95,66651%
Nurses and nurse practitioners24,64313%
Behavioral health clinicians23,54112%
Physician assistants13,0347%
Therapists (PT and OT)11,5406%
Other HCPs20,09311%

Source: Dmand AI Affiliation Data

Los Angeles has the most medical groups in California, with 584

584medical groups in Los Angeles 354medical groups in San Diego 232medical groups in San Francisco 182medical groups in Fresno 167medical groups in Glendale 166medical groups in Bakersfield

More California cities with medical groups

Source: Doctors and Clinicians National Downloadable File (CMS)

Each California 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 California 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 California

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 California?

There are 10,378 medical groups in California with a Medicare PAC ID: 2,304 multi-specialty and 8,073 single-specialty.

What is the largest medical group in California?

The Permanente Medical Group, Inc. in Pleasanton, with 11,708 physicians and 21,035 HCPs with a California address. Southern California Permanente Medical Group is second with 11,175, and UCSF Pediatrics is third with 3,527.

Which health system has the most medical groups in California?

By physicians, Kaiser Permanente, with 22,698 across 8 groups, followed by University of California Health with 10,033 and Vituity with 4,133.

How many California medical groups are independent?

7,610, or 73%, have no larger parent organization in the Dmand AI org hierarchy. 667 belong to a health system or hospital and 873 to a physician platform or corporate owner.

How many California medical groups practice at a hospital?

1,631 California 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 California 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.

Dmand AI

Find the right contacts at every California medical group

Search 10,378 groups by specialty, size and parent organization, with the physicians and leaders at each one.

Start free trial Book a demo

30 days free
Self-serve
No credit card