Internists in Fontana, CA
- Internists
- 187
- Linked to a hospital or group
- 170
- Hospitals with an internist
- 17
- Medical groups with an internist
- 28
- Practice at a hospital
- 135
There are 187 internists in Fontana. Southern California Permanente Medical Group has the most, 159, and Fontana Medical Center has the most affiliated internists, 125. 24% finished medical school 30 or more years ago.
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Fontana internists, listed A to Z by last name
Each internist on the list has internal medicine as their primary specialty and a Fontana practice address. The list shows the NPI, and how many hospitals and medical groups each one practices with. A free account names every hospital and group, with validated contacts.
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Showing 1 to 50 of 175 Fontana internists
The list shows the 175 internists with a public profile. The other 12 are counted in the total and searchable with a free account.
Sources: NPPES NPI Registry (CMS) and Dmand AI Affiliation Data
For health IT teams
Dmand AI has the EHR for 181 of 187 Fontana internists, at their hospital and their practice. Filter by Epic, Oracle Health, MEDITECH, athenahealth and more, then reach them with validated work emails and mobile numbers.
Southern California Permanente Medical Group has the most internists in Fontana, with 159
Beaver Medical Group is second with 7, and Optum - Downtown Los Angeles third with 6. Counts are internists with a California address linked to each group.
Sources: Dmand AI Affiliation Data and Dmand AI Org Hierarchy Data
Fontana Medical Center has the most affiliated internists in Fontana, with 125
Loma Linda University Medical Center is second with 3, and Cedars-Sinai Medical Center third with 3. Fontana internists are affiliated with 17 hospitals in all.
See every hospital and group for each Fontana internist
Each public profile names one place an internist practices. A free account shows all of them, with the employer, the EHR and validated contacts.
Source: Dmand AI Affiliation Data
Most Fontana internists practice at a hospital: 135 of the 165 with a mapped site
65 also practice at a medical group site, and 6 at physician offices. An internist can practice at several kinds of site, so the shares overlap.
Fontana internists by site of care
- Hospitals135
- Medical group practices65
- Physician offices6
Sources: Dmand AI Affiliation Data and Dmand AI Practice Data
24% of Fontana internists finished medical school 30 or more years ago
38 of the 159 Fontana internists with a graduation year on file. 16 graduated in the last 10 years.
Physicians by years since medical school
- Under 10 years ago16
- 10 to 19 years ago50
- 20 to 29 years ago55
- 30 to 39 years ago28
- 40 or more years ago10
Source: Dmand AI Professional Profile Data
Every Fontana internist profile shows current hospitals and groups, Medicare activity and NPI details
- Primary practiceThe main place they practice, with its type and cityOn every profile
- Every site of careEach hospital, clinic and group where they practice nowWith a free account
- EmployerThe organization they work for, when one is on fileWith a free account
- Medicare servicesServices and procedure codes billed to Medicare, from CMSOn every profile
- Medicare Part D prescribingClaims and drug costs from Part D, from CMSOn every profile
- Industry paymentsPayments from drug and device makers, from CMS Open PaymentsOn every profile
- Publications and clinical trialsResearch papers and trials linked to the NPI, when on fileOn every profile
- Licenses and graduation yearState license numbers and medical school graduation yearOn every profile
- NPI detailsNPI, enumeration date, primary taxonomy and practice addressOn every profile
- Work email and mobile numberFound on request through healthcare waterfall enrichment, then validatedWith a free account
- EHR in useThe EHR at each site where they practiceWith a free account
- Colleagues at each siteThe clinicians they work with at each hospital and groupWith a free account
Free account: 30 days free, self-serve, no credit card.
Sources: NPPES NPI Registry (CMS), Medicare Physician & Other Practitioners (CMS), Open Payments (CMS) and Dmand AI Affiliation Data
Sources for the Fontana internist directory
| Data on this page | Source |
|---|---|
| HCPs, types and specialties | NPPES NPI Registry (CMS) and Dmand AI Professional Profile Data |
| Sites of care, hospitals and medical groups | Dmand AI Affiliation Data |
| Medical school graduation year | Dmand AI Professional Profile Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
Internists are HCPs whose primary specialty is internal medicine (taxonomy code 207R00000X), with an active NPI and a Fontana practice address.
FAQ
Frequently asked questions about internists 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 internists are in Fontana?
187 internists have an active NPI, a Fontana practice address and internal medicine (taxonomy code 207R00000X) as their primary specialty. 170 of them are linked to a hospital or medical group.
Which Fontana medical groups have the most internists?
Southern California Permanente Medical Group, with 159, followed by Beaver Medical Group with 7 and Optum - Downtown Los Angeles with 6.
Which Fontana hospitals have the most internists?
Fontana Medical Center, with 125 affiliated internists, followed by Loma Linda University Medical Center with 3 and Cedars-Sinai Medical Center with 3.
What share of Fontana internists practice at a hospital?
135 of the 165 Fontana internists with a mapped site of care, or 82%, have a current hospital affiliation.
What is the taxonomy code for internal medicine?
207R00000X is the NPPES taxonomy code for internal medicine. Sub-specialties with their own code are counted on their own lists.
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