Updated October 2026

Largest primary care groups in California

Medical group directory
California
Primary care

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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Primary care groups in California, ranked by physicians, 51 to 100
#	Medical group	Parent organization	Physicians	HCPs	Decision makers
51	San Joaquin Faculty Medical GroupFrench Camp · 51 sites	-	330	448	Decision makers
52	Torrance Memorial Physician NetworkTorrance · 37 sites	Parent on file	313	429	Decision makers
53	Quantum Healthcare Medical Associates IncColton · 24 sites	-	297	316	Decision makers
54	Sansum ClinicSanta Barbara · 36 sites	Parent on file	291	454	Decision makers
55	Riverside Medical ClinicRiverside · 17 sites	Parent on file	284	347	Decision makers
56	BASS Medical GroupWalnut Creek · 96 sites	Parent on file	283	447	Decision makers
57	Indio Community Health CenterRiverside · 65 sites	Parent on file	275	457	Decision makers
58	Providence Medical InstituteTorrance · 65 sites	Parent on file	269	346	Decision makers
59	Inspire Health Medical GroupFresno · 18 sites	-	266	352	Decision makers
60	Santé Foundation Medical GroupFresno · 76 sites	Parent on file	260	541	Decision makers
61	Inspire Health Medical GroupFresno · 16 sites	-	260	354	Decision makers
62	UCSF Medical GroupSan Francisco · 34 sites	Parent on file	248	380	Decision makers
63	ProHealth PartnersLakewood · 89 sites	Parent on file	239	343	Decision makers
64	SHIPMG RadiologySan Diego · 27 sites	-	233	293	Decision makers
65	Saint Agnes CareFresno · 26 sites	Parent on file	225	289	Decision makers
66	Salinas Valley Health ClinicsSalinas · 24 sites	Parent on file	215	326	Decision makers
67	Community Memorial HealthcareVentura · 38 sites	Parent on file	212	302	Decision makers
68	Pacific Central Coast Health Centers Medical GroupSanta Maria · 50 sites	Parent on file	199	316	Decision makers
69	On-Call SpecialistsSan Diego · 23 sites	-	197	214	Decision makers
70	OptumCare Medical GroupLos Alamitos · 38 sites	Parent on file	194	286	Decision makers
71	UC San Diego HealthLos Angeles · 15 sites	Parent on file	193	274	Decision makers
72	Golden Valley Health CentersMerced · 60 sites	Parent on file	188	449	Decision makers
73	Pacific Inpatient Medical GroupSan Francisco · 18 sites	Parent on file	186	206	Decision makers
74	Family HealthCare NetworkVisalia · 73 sites	Parent on file	184	516	Decision makers
75	UCI HealthOrange · 14 sites	Parent on file	182	227	Decision makers
76	San Francisco International Airport (SFO) Medical ClinicSan Francisco · 43 sites	Parent on file	181	218	Decision makers
77	Quantum Bay Area Hospitalist Medical Group IncMountain View · 8 sites	-	172	174	Decision makers
78	Signify HealthSan Francisco · 15 sites	Parent on file	168	302	Decision makers
79	Superior Hospitalist Medical GroupLos Angeles · 18 sites	-	168	184	Decision makers
80	Community Hospital of the Monterey PeninsulaMonterey · 11 sites	Parent on file	165	243	Decision makers
81	Southern California Hospitalist NetworkOrange · 14 sites	Parent on file	165	178	Decision makers
82	Huntington Health PhysiciansPasadena · 16 sites	Parent on file	160	201	Decision makers
83	VituityRedding · 11 sites	Parent on file	156	174	Decision makers
84	Unio Specialty Care, Urology, Encinitas (formerly Genesis Healthcare Partners)Encinitas · 67 sites	Parent on file	154	295	Decision makers
85	Palomar Health Medical GroupPoway · 23 sites	Parent on file	154	216	Decision makers
86	Washington Health Medical GroupFremont · 23 sites	Parent on file	153	203	Decision makers
87	Hospitalists of Modesto Medical GroupModesto · 11 sites	Parent on file	151	171	Decision makers
88	Clinica Sierra VistaFresno · 43 sites	Parent on file	149	360	Decision makers
89	One MedicalSan Francisco · 69 sites	Parent on file	147	350	Decision makers
90	Lakeside Community HealthcareNorthridge · 16 sites	Parent on file	146	264	Decision makers
91	Adventist Health SonoraSonora · 19 sites	Parent on file	145	214	Decision makers
92	Kansal IncWest Hollywood · 13 sites	-	144	155	Decision makers
93	Oro Health ProfessionalOroville · 14 sites	Parent on file	143	274	Decision makers
94	NorthBay HealthFairfield · 29 sites	Parent on file	137	241	Decision makers
95	Marshall Medical CenterEl Dorado Hills · 17 sites	Parent on file	134	200	Decision makers
96	United Medical DoctorsMurrieta · 30 sites	-	132	257	Decision makers
97	CareConnectMDCosta Mesa · 23 sites	Parent on file	131	199	Decision makers
98	CEP AmericaEmeryville · 29 sites	Parent on file	130	164	Decision makers
99	Adventist Health Ukiah ValleyUkiah · 14 sites	Parent on file	129	189	Decision makers
100	24 On Physicians Of California PCPorterville · 5 sites	-	128	130	Decision makers

Showing 51 to 100 of 3,969 primary care groups in California

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

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