Medical groups in Fullerton, CA
- Medical groups
- 57
- Multi-specialty
- 12
- Single-specialty
- 45
- More than one site
- 22
There are 57 medical groups in Fullerton with a Medicare PAC ID. St. Jude Radiology Medical Group, Inc. is the largest, with 76 California physicians, followed by St. Jude Emergency Medicine Group with 48. 82% of Fullerton groups are independent.
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St. Jude Radiology Medical Group, Inc. is the largest medical group in Fullerton, with 76 physicians
Ranked by physicians with a California address linked to each group based in Fullerton. St. Jude Emergency Medicine Group is second with 48, and Retina Consultants of Orange County third with 9.
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Showing 1 to 10 of 57 medical groups in Fullerton
Sources: Doctors and Clinicians National Downloadable File (CMS) and Dmand AI Affiliation Data
Providence Health & Services has the most physicians in Fullerton medical groups, with 54 across 4 groups
Dmand AI maps every Fullerton medical group to its parent organization, up to the health system or platform at the top. 1 parent organizations have two or more Fullerton medical groups. Each clinician counts once per parent organization.
- Providence Health & Services
- St. Jude Emergency Medicine Group
- St. Jude Heritage Medical Group
- 2 more Fullerton groups and their practice sites
See every medical group, site and clinician under Providence Health & Services
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 57 Fullerton medical groups, with the parent organization above each one, and finds validated work emails and mobile numbers.
82% of Fullerton 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.
Fullerton medical groups by ownership
- Independent47
- Health system or hospital4
- Platform or corporate owner4
- Other organization2
Source: Dmand AI Org Hierarchy Data
8 Fullerton 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.
Fullerton medical groups by site of care
- Hospitals8
- Therapy and rehab centers5
- Ambulatory surgery centers1
- Behavioral health facilities1
Sources: Dmand AI Practice Data and Dmand AI Org Hierarchy Data
Primary care groups are the most common medical groups in Fullerton, with 12
Each group is counted once, under its main specialty. Eye care groups are second, with 9, and 12 Fullerton groups are multi-specialty.
- Primary care12
- Eye care9
- Behavioral and mental health7
- Rehabilitation and therapy7
- Anesthesia and pain3
- Dermatology3
- Podiatry3
- Chiropractic2
- Emergency and hospital medicine2
- ENT and audiology2
- Orthopedics and sports medicine2
- Urology and nephrology2
- OB/GYN and women's health1
- Pathology and laboratory1
- Radiology and imaging1
Source: Dmand AI Professional Profile Data
411 California HCPs work in Fullerton medical groups, 225 of them physicians
Each clinician is counted once, across every Fullerton group they are linked to. Only clinicians with a California address are counted.
HCPs in Fullerton medical groups by type
- Physicians (MD, DO)225
- Physician assistants53
- Therapists (PT and OT)33
- Nurses and nurse practitioners30
- Optometrists and opticians27
- Other HCPs43
Source: Dmand AI Affiliation Data
Each Fullerton 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
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Sources: Doctors and Clinicians National Downloadable File (CMS), Medicare Physician & Other Practitioners (CMS) and Dmand AI Org Hierarchy Data
Sources for the Fullerton medical group directory
| 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
The directory lists groups based in Fullerton with a Medicare PAC ID.
FAQ
Frequently asked questions about medical groups in Fullerton
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 Fullerton?
There are 57 medical groups based in Fullerton with a Medicare PAC ID: 12 multi-specialty and 45 single-specialty. 22 of them have more than one site.
What is the largest medical group in Fullerton?
St. Jude Radiology Medical Group, Inc., with 76 physicians and 77 HCPs with a California address. St. Jude Emergency Medicine Group is second with 48, and Retina Consultants of Orange County is third with 9.
How many Fullerton medical groups are independent?
47, or 82%, have no larger parent organization in the Dmand AI org hierarchy. 4 belong to a health system or hospital and 4 to a physician platform or corporate owner.
How many Fullerton medical groups practice at a hospital?
8 Fullerton 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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