Updated October 2026

Medical groups in Orange, CA

Medical group directory
Orange, California

Medical groups: 120
Multi-specialty: 26
Single-specialty: 94
More than one site: 72
100+ physicians: 12

There are 120 medical groups in Orange with a Medicare PAC ID. UCI Health Physicians is the largest, with 401 California physicians, followed by Allied Anesthesia Medical Group with 353. 50% of Orange groups are independent.

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UCI Health Physicians is the largest medical group in Orange, with 401 physicians

Ranked by physicians with a California address linked to each group based in Orange. Allied Anesthesia Medical Group is second with 353, and UCI Health Anesthesia & Perioperative Care Services third with 316. 12 Orange groups have 100 or more physicians.

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Medical groups in Orange, ranked by physicians
#	Medical group	Parent organization	Physicians	HCPs	Decision makers
1	UCI Health PhysiciansOrange · 28 sites	Parent on file	401	530	Decision makers
2	Allied Anesthesia Medical GroupOrange · 42 sites	-	353	398	Decision makers
3	UCI Health Anesthesia & Perioperative Care ServicesOrange · 34 sites	Parent on file	316	503	Decision makers
4	CHOC Children'sOrange · 30 sites	Parent on file	305	442	Decision makers
5	UCI HealthOrange · 14 sites	Parent on file	182	227	Decision makers
6	UCI Department of Radiological SciencesOrange · 9 sites	Parent on file	167	173	Decision makers
7	Southern California Hospitalist NetworkOrange · 14 sites	Parent on file	165	178	Decision makers
8	UCI Health PhysiciansOrange · 16 sites	Parent on file	156	203	Decision makers
9	Orange Coast AnesthesiaOrange · 16 sites	Parent on file	130	138	Decision makers
10	UCI HealthOrange · 12 sites	Parent on file	118	156	Decision makers
11	OB/GYN University AssociatesOrange · 7 sites	Parent on file	115	145	Decision makers
12	UCI Health PhysiciansOrange · 11 sites	Parent on file	114	203	Decision makers
13	UCI Health PhysiciansOrange · 8 sites	Parent on file	94	121	Decision makers
14	UCI HealthOrange · 10 sites	Parent on file	87	122	Decision makers
15	UCI Health Gavin Herbert Eye InstituteOrange · 7 sites	Parent on file	78	100	Decision makers
16	Emergency Medicine Specialists of Orange CountyOrange · 9 sites	Parent on file	75	125	Decision makers
17	UCI Health Pathology and Laboratory Services (Department of Pathology & Laboratory Science)Orange · 6 sites	Parent on file	69	75	Decision makers
18	UCI Health Pathology and Laboratory ServicesOrange · 3 sites	Parent on file	69	73	Decision makers
19	Regents Of The University Of CaliforniaOrange · 13 sites	Parent on file	66	79	Decision makers
20	UCI Health PhysiciansOrange · 5 sites	Parent on file	61	78	Decision makers
21	UCI Health Center for Urological CareOrange · 5 sites	Parent on file	48	80	Decision makers
22	UCI Health Dermatology ServicesOrange · 4 sites	Parent on file	47	51	Decision makers
23	UCI Department of Psychiatry & Human BehaviorOrange · 5 sites	Parent on file	44	58	Decision makers
24	UCI Health Orthopaedic Surgery ServicesOrange · 3 sites	Parent on file	40	70	Decision makers
25	Orthopaedic Specialty InstituteOrange · 7 sites	-	40	65	Decision makers
26	Moran, Rowen & Dorsey (MRD Imaging)Orange · 16 sites	Parent on file	35	39	Decision makers
27	Crystal Anesthesiology IncOrange · 4 sites	Parent on file	29	29	Decision makers
28	UCI Head & NeckOrange · 3 sites	Parent on file	27	54	Decision makers
29	Orange County Heart InstituteOrange · 3 sites	-	27	29	Decision makers
30	UCI Health PhysiciansOrange · 3 sites	Parent on file	24	27	Decision makers
31	Neurosurgical Associates of IrvineOrange · 4 sites	Parent on file	22	37	Decision makers
32	Senior DocOrange · 4 sites	Parent on file	21	78	Decision makers
33	UCI Plastic SurgeryOrange · 2 sites	Parent on file	15	34	Decision makers
34	OC Progressive RecoveryOrange · 4 sites	-	12	30	Decision makers
35	Orange County Thoracic and Cardiovascular SurgeonsOrange · 1 site	-	11	16	Decision makers
36	Department of Physical Medicine & RehabilitationOrange · 2 sites	Parent on file	11	14	Decision makers
37	Restore Orthopedics & Spine CenterOrange · 1 site	-	10	26	Decision makers
38	Adult & Pediatric Orthopaedic Specialists-OrangeOrange · 11 sites	Parent on file	10	12	Decision makers
39	Vascular & Interventional Specialists of Orange CountyOrange · 3 sites	-	10	12	Decision makers
40	Center for Inherited Blood Disorders (CIBD)Orange · 2 sites	Parent on file	10	11	Decision makers
41	Zand Medical PartnersOrange · 1 site	-	9	17	Decision makers
42	Integrated Critical Care and Pulmonary SpecialistsOrange · 2 sites	-	9	12	Decision makers
43	Reza Shahbaz, M.D., Inc.Orange · 7 sites	-	9	10	Decision makers
44	Kevin Pham, MD INCOrange · 3 sites	Parent on file	7	8	Decision makers
45	Nephrology Specialists Medical GroupOrange · 2 sites	-	7	8	Decision makers
46	Orangewood Medical ClinicOrange · 2 sites	-	7	8	Decision makers
47	Orange Surgical AssociatesOrange · 1 site	-	7	7	Decision makers
48	Comprehensive Pulmonary and Primary CareOrange · 1 site	-	6	12	Decision makers
49	House Ear ClinicOrange · 3 sites	Parent on file	6	12	Decision makers
50	Orange Orthopedic Medical GroupOrange · 1 site	-	6	12	Decision makers

Showing 1 to 10 of 120 medical groups in Orange

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

UC Irvine has the most physicians in Orange medical groups, with 2,019 across 24 groups

Dmand AI maps every Orange medical group to its parent organization, up to the health system or platform at the top. 5 parent organizations have two or more Orange medical groups. Each clinician counts once per parent organization.

Parent organizations with the most Orange medical groups
#	Parent organization	Orange groups	Physicians	HCPs
1	UC IrvineAcademic health system	24	2,019	2,677
2	Rady Children's HealthHealth system	2	313	451
3	UnitedHealth GroupDiversified health company	2	36	37
4	Senior DocPhysician practice platform	14	24	92
5	Providence Health & ServicesHealth system	5	9	29

Parent organizations with two or more Orange groups

UC IrvineAcademic health system · 24 Orange medical groups
UCI Health PhysiciansMedical group · 28 sites
UCI Health Anesthesia & Perioperative Care ServicesMedical group · 34 sites
22 more Orange groups and their practice sites

See every medical group, site and clinician under UC Irvine

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Source: Dmand AI Org Hierarchy Data

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Dmand AI maps the owners, administrators and physician leaders at each of the 120 Orange medical groups, with the parent organization above each one, and finds validated work emails and mobile numbers.

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50% of Orange 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.

Orange medical groups by ownership

Independent6050%
Health system or hospital3328%
Platform or corporate owner2218%
Other organization54%

Source: Dmand AI Org Hierarchy Data

37 Orange 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.

Orange medical groups by site of care

Hospitals3731%
Ambulatory surgery centers76%
FQHCs22%
Therapy and rehab centers11%
Behavioral health facilities11%

Sources: Dmand AI Practice Data and Dmand AI Org Hierarchy Data

Primary care groups are the most common medical groups in Orange, with 54

Each group is counted once, under its main specialty. Behavioral and mental health groups are second, with 10, and 26 Orange groups are multi-specialty.

Source: Dmand AI Professional Profile Data

4,500 California HCPs work in Orange medical groups, 3,246 of them physicians

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

HCPs in Orange medical groups by type

Physicians (MD, DO)3,24672%
Nurses and nurse practitioners62114%
Physician assistants2435%
Non-clinical and support staff1313%
Behavioral health clinicians682%
Other HCPs1914%

Source: Dmand AI Affiliation Data

Each Orange 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 Orange 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 based in Orange with a Medicare PAC ID.

FAQ

Frequently asked questions about medical groups in Orange

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 Orange?

There are 120 medical groups based in Orange with a Medicare PAC ID: 26 multi-specialty and 94 single-specialty. 72 of them have more than one site.

What is the largest medical group in Orange?

UCI Health Physicians, with 401 physicians and 530 HCPs with a California address. Allied Anesthesia Medical Group is second with 353, and UCI Health Anesthesia & Perioperative Care Services is third with 316.

Which health system has the most medical groups in Orange?

By physicians, UC Irvine, with 2,019 across 24 groups, followed by Rady Children's Health with 313 and UnitedHealth Group with 36.

How many Orange medical groups are independent?

60, or 50%, have no larger parent organization in the Dmand AI org hierarchy. 33 belong to a health system or hospital and 22 to a physician platform or corporate owner.

How many Orange medical groups practice at a hospital?

37 Orange 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.

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