Medical groups in Fontana, CA
- Medical groups
- 20
- Multi-specialty
- 6
- Single-specialty
- 14
- More than one site
- 11
There are 20 medical groups in Fontana with a Medicare PAC ID. Optum (formerly Pinnacle Medical Group) is the largest, with 94 California physicians, followed by Mountain View Urgent Care with 42. 75% of Fontana groups are independent.
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Optum (formerly Pinnacle Medical Group) is the largest medical group in Fontana, with 94 physicians
Ranked by physicians with a California address linked to each group based in Fontana. Mountain View Urgent Care is second with 42, and Summit Family Health Center third with 23.
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Showing 1 to 10 of 20 medical groups in Fontana
Sources: Doctors and Clinicians National Downloadable File (CMS) and Dmand AI Affiliation Data
75% of Fontana 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.
Fontana medical groups by ownership
- Independent15
- Platform or corporate owner1
- Other organization4
Source: Dmand AI Org Hierarchy Data
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Dmand AI maps the owners, administrators and physician leaders at each of the 20 Fontana medical groups, with the parent organization above each one, and finds validated work emails and mobile numbers.
3 Fontana 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.
Fontana medical groups by site of care
- Hospitals3
- Ambulatory surgery centers1
- FQHCs1
- Behavioral health facilities1
Sources: Dmand AI Practice Data and Dmand AI Org Hierarchy Data
Primary care groups are the most common medical groups in Fontana, with 12
Each group is counted once, under its main specialty. Eye care groups are second, with 2, and 6 Fontana groups are multi-specialty.
- Primary care12
- Eye care2
- Podiatry2
- Anesthesia and pain1
- Behavioral and mental health1
- Emergency and hospital medicine1
- Rehabilitation and therapy1
Source: Dmand AI Professional Profile Data
489 California HCPs work in Fontana medical groups, 200 of them physicians
Each clinician is counted once, across every Fontana group they are linked to. Only clinicians with a California address are counted.
HCPs in Fontana medical groups by type
- Physicians (MD, DO)200
- Nurses and nurse practitioners169
- Physician assistants69
- Non-clinical and support staff14
- Optometrists and opticians13
- Other HCPs24
Source: Dmand AI Affiliation Data
Each Fontana 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 Fontana 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 Fontana with a Medicare PAC ID.
FAQ
Frequently asked questions about medical groups in Fontana
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 Fontana?
There are 20 medical groups based in Fontana with a Medicare PAC ID: 6 multi-specialty and 14 single-specialty. 11 of them have more than one site.
What is the largest medical group in Fontana?
Optum (formerly Pinnacle Medical Group), with 94 physicians and 139 HCPs with a California address. Mountain View Urgent Care is second with 42, and Summit Family Health Center is third with 23.
How many Fontana medical groups are independent?
15, or 75%, have no larger parent organization in the Dmand AI org hierarchy. 1 to a physician platform or corporate owner.
How many Fontana medical groups practice at a hospital?
3 Fontana 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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