Internists in California
- Internists
- 18,948
- Linked to a hospital or group
- 15,803
- Hospitals with an internist
- 370
- Medical groups with an internist
- 2,215
- Cities
- 510
There are 18,948 internists in California. The Permanente Medical Group, Inc. has the most, 2,011, and Stanford Hospital at 300 Pasteur Drive has the most affiliated internists, 584. Los Angeles is home to 1,376, and 34% finished medical school 30 or more years ago.
Find work emails and mobile numbers for all 18,948 California internists
Validated work emails and mobile numbers for California internists, found through healthcare waterfall enrichment, with a free Dmand AI account.
California internists, listed A to Z by last name
Each internist on the list has internal medicine as their primary specialty and a California practice address. The list shows the NPI and city, and how many hospitals and medical groups each one practices with. A free account names every hospital and group, with validated contacts.
Filter this list with a free account
Sort and filter all 18,948 California internists by city, hospital, medical group, the EHR they use and Medicare volume in Dmand AI.
Showing 1 to 10 of 16,751 California internists
The list shows the 16,751 internists with a public profile. The other 2,197 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 16,556 of 18,948 California 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.
The Permanente Medical Group, Inc. has the most internists in California, with 2,011
Southern California Permanente Medical Group is second with 1,764, and Optum - Downtown Los Angeles third with 498. Counts are internists with a California address linked to each group.
Sources: Dmand AI Affiliation Data and Dmand AI Org Hierarchy Data
Stanford Hospital at 300 Pasteur Drive has the most affiliated internists in California, with 584
UCSF Helen Diller Medical Center at Parnassus Heights in San Francisco is second with 453, and Ronald Reagan UCLA Medical Center third with 375. California internists are affiliated with 370 hospitals in all.
See every hospital and group for each California 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
Los Angeles has the most internists in California, with 1,376
More California cities with internists
- Stockton376
- Oakland334
- Fresno323
- Richmond302
- Anaheim292
- Torrance287
- Long Beach285
- Santa Clara282
- Santa Monica228
Internists practice in 510 California cities. Every city with 10 or more has its own page.
Source: NPPES NPI Registry (CMS)
Most California internists practice at a hospital: 11,884 of the 15,426 with a mapped site
7,833 also practice at a medical group site, and 3,278 at home health agencies. An internist can practice at several kinds of site, so the shares overlap.
California internists by site of care
- Hospitals11,884
- Medical group practices7,833
- Home health agencies3,278
- Physician offices1,694
- FQHCs1,129
Sources: Dmand AI Affiliation Data and Dmand AI Practice Data
34% of California internists finished medical school 30 or more years ago
4,603 of the 13,609 California internists with a graduation year on file. 2,209 graduated in the last 10 years.
Physicians by years since medical school
- Under 10 years ago2,209
- 10 to 19 years ago3,495
- 20 to 29 years ago3,302
- 30 to 39 years ago2,706
- 40 or more years ago1,897
Source: Dmand AI Professional Profile Data
Every California 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 California 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 California practice address.
FAQ
Frequently asked questions about internists in California
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 California?
18,948 internists have an active NPI, a California practice address and internal medicine (taxonomy code 207R00000X) as their primary specialty. 15,803 of them are linked to a hospital or medical group.
Which California medical groups have the most internists?
The Permanente Medical Group, Inc., with 2,011, followed by Southern California Permanente Medical Group with 1,764 and Optum - Downtown Los Angeles with 498.
Which California hospitals have the most internists?
Stanford Hospital at 300 Pasteur Drive, with 584 affiliated internists, followed by UCSF Helen Diller Medical Center at Parnassus Heights with 453 and Ronald Reagan UCLA Medical Center with 375.
Which California cities have the most internists?
Los Angeles, with 1,376, followed by San Francisco (1,362) and San Diego (1,000). Internists practice in 510 California cities in all.
How many California internists finished medical school 30 or more years ago?
4,603 of the 13,609 with a graduation year on file, or 34%. 2,209 graduated in the last 10 years.
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.
How can I contact internists in California?
Dmand AI finds validated work emails, mobile numbers and practice phone numbers for internists in California through healthcare waterfall enrichment, matched to the site where each one practices now. They are available with a free Dmand AI account: 30 days free, self-serve, no credit card.
Dmand AI
Find the right contacts among California internists
Search 18,948 California internists by hospital, medical group and the EHR they use, with validated work emails and mobile numbers.
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