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.

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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.

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Medical groups in California, ranked by physicians, 6,951 to 7,000
#	Medical group	Parent organization	Physicians	HCPs	Decision makers
6951	Northern Heart & Vascular InstituteRedding · 5 sites	-	1	2	Decision makers
6952	NPMD ClinicEncino · 1 site	-	1	2	Decision makers
6953	NTM Medical GroupLong Beach · 1 site	-	1	2	Decision makers
6954	Nuclear Medicine AssociatesRedding · 1 site	Parent on file	1	2	Decision makers
6955	O & D Surgical and Medical Solutions Inc.Modesto · 2 sites	-	1	2	Decision makers
6956	O.C. Cardiovascular Care Inc.Fountain Valley · 1 site	-	1	2	Decision makers
6957	Oakview Medical GroupVisalia · 1 site	-	1	2	Decision makers
6958	OC Family Medical CenterOrange · 1 site	-	1	2	Decision makers
6959	OC Geriatric and Anaheim Cardiology Medical Group, IncAnaheim · 1 site	-	1	2	Decision makers
6960	OC Lung DoctorFountain Valley · 1 site	-	1	2	Decision makers
6961	Ocean Breeze Medical GroupSan Clemente · 1 site	-	1	2	Decision makers
6962	Ocean View Psychiatric Health FacilityLong Beach · 1 site	Parent on file	1	2	Decision makers
6963	Oceanview DermatologySanta Barbara · 1 site	-	1	2	Decision makers
6964	OCLung - Jerry Hsieh MDFountain Valley · 1 site	-	1	2	Decision makers
6965	Ojai ENTOjai · 1 site	-	1	2	Decision makers
6966	Oliver Solomon DOGlendora · 1 site	Parent on file	1	2	Decision makers
6967	Omeed Ahadiat, MDYorba Linda · 1 site	-	1	2	Decision makers
6968	Omega Health ClinicsModesto · 1 site	-	1	2	Decision makers
6969	Omega HealthcarePomona · 2 sites	Parent on file	1	2	Decision makers
6970	Omni Eye CareCovina · 2 sites	-	1	2	Decision makers
6971	ONE Brain & Spine CenterIrvine · 2 sites	-	1	2	Decision makers
6972	One Life Physical TherapyCoronado · 1 site	-	1	2	Decision makers
6973	One NeuroLong Beach · 1 site	-	1	2	Decision makers
6974	Optimal Medical CareVisalia · 1 site	-	1	2	Decision makers
6975	Orange Coast CardiologyNewport Beach · 1 site	-	1	2	Decision makers
6976	Orange County Bone & JointFountain Valley · 1 site	-	1	2	Decision makers
6977	Orange County Cardiac Rhythm InstituteHuntington Beach · 1 site	-	1	2	Decision makers
6978	Orange County CardiovascularFountain Valley · 1 site	-	1	2	Decision makers
6979	Orange County Cataract and GlaucomaSanta Ana · 2 sites	-	1	2	Decision makers
6980	Orange County Emergency Surgical Specialists, Inc.Santa Ana · 1 site	Parent on file	1	2	Decision makers
6981	Orange County Heart and VascularTustin · 1 site	-	1	2	Decision makers
6982	Orange County KidneyFountain Valley · 2 sites	Parent on file	1	2	Decision makers
6983	Orange County Neurosurgical AssociatesLaguna Hills · 1 site	-	1	2	Decision makers
6984	Orange County Neurosurgical AssociatesLaguna Hills · 2 sites	-	1	2	Decision makers
6985	Orange County Palliative Care GroupLaguna Hills · 1 site	-	1	2	Decision makers
6986	Orange County Rehab Physical Therapy & Sports MedicineAnaheim · 1 site	-	1	2	Decision makers
6987	OrthoCareChino Hills · 3 sites	-	1	2	Decision makers
6988	OrthoMed CenterModesto · 1 site	-	1	2	Decision makers
6989	Orthopaedic Sports SpecialistsFremont · 2 sites	-	1	2	Decision makers
6990	Orthopaedic Surgery and Sports Medicine CenterTemecula · 1 site	-	1	2	Decision makers
6991	Orthopaedic Surgical SpecialistsTorrance · 1 site	-	1	2	Decision makers
6992	Orthopaedic Surgical SpecialistsLawndale · 1 site	-	1	2	Decision makers
6993	Orthopedic Pain Management CenterEncino · 1 site	-	1	2	Decision makers
6994	OrthoSpine Advance Health, Inc.Merced · 2 sites	-	1	2	Decision makers
6995	Oscar Zambrano, MD, Inc.Bell · 1 site	-	1	2	Decision makers
6996	Oxford CareChula Vista · 1 site	-	1	2	Decision makers
6997	P.B. Iyer, M.D.Gustine · 1 site	-	1	2	Decision makers
6998	Pabalan Eye CenterRiverside · 1 site	Parent on file	1	2	Decision makers
6999	Pablo J. Bassuk, MDGlendale · 1 site	Parent on file	1	2	Decision makers
7000	Pacific Bay DermatologyMonterey · 2 sites	-	1	2	Decision makers

Showing 6,951 to 7,000 of 10,378 medical groups in California

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

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