Internists in the United States
- Internists
- 153,916
- Linked to a hospital or group
- 123,342
- Hospitals with an internist
- 5,233
- Medical groups with an internist
- 21,803
- States and territories
- 56
There are 153,916 internists in the US. California has the most, 18,948, and Brigham and Women's Hospital has the most affiliated internists of any hospital, 1,096. 35% finished medical school 30 or more years ago.
Find work emails and mobile numbers for all 153,916 US internists
Validated work emails and mobile numbers for US internists, found through healthcare waterfall enrichment, with a free Dmand AI account.
California has the most internists, with 18,948
There are 153,916 internists in the US, according to Dmand AI data. New York is second with 11,586, and Florida third with 10,075.
Internists in every other state and territory
- North Carolina4,225
- Georgia4,084
- Maryland3,924
- Virginia3,893
- Washington3,170
- Arizona2,968
- Tennessee2,817
- Minnesota2,797
- Missouri2,676
- Connecticut2,500
- Indiana2,223
- Wisconsin2,161
- Oregon2,152
- Colorado2,090
- South Carolina2,047
- Alabama1,879
- Louisiana1,774
- Kentucky1,570
- Oklahoma1,212
- Nevada1,161
- Puerto Rico1,113
- Kansas1,074
- Iowa990
- Rhode Island980
- Mississippi968
- Hawaii943
- Nebraska878
- New Mexico869
- Washington, DC830
- West Virginia814
- Utah802
- Arkansas748
- Maine688
- Delaware670
- New Hampshire665
- Idaho507
- Montana388
- Vermont372
- South Dakota306
- North Dakota259
- Alaska225
- Wyoming150
- American Samoa23
- Guam14
- U.S. Virgin Islands10
- Northern Mariana Islands7
Source: NPPES NPI Registry (CMS)
For health IT teams
Dmand AI has the EHR for 134,350 of 153,916 US 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 of any US medical group, with 2,070
Southern California Permanente Medical Group is second with 1,792, and Sound Physicians third with 1,397. Counts are internists linked to each group.
Sources: Dmand AI Affiliation Data and Dmand AI Org Hierarchy Data
Brigham and Women's Hospital has the most affiliated internists of any US hospital, with 1,096
Massachusetts General Hospital in Boston is second with 1,072, and Beth Israel Deaconess Medical Center third with 787. US internists are affiliated with 5,233 hospitals in all.
See every hospital and group for each US 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
98,386 US internists practice at a hospital, the most common site of care
63,739 also practice at a medical group site, and 28,525 at home health agencies. An internist can practice at several kinds of site, so the shares overlap.
US internists by site of care
- Hospitals98,386
- Medical group practices63,739
- Home health agencies28,525
- Physician offices12,014
- Hospices11,113
Sources: Dmand AI Affiliation Data and Dmand AI Practice Data
35% of US internists finished medical school 30 or more years ago
37,206 of the 106,452 US internists with a graduation year on file. 19,436 graduated in the last 10 years.
Physicians by years since medical school
- Under 10 years ago19,436
- 10 to 19 years ago27,606
- 20 to 29 years ago22,204
- 30 to 39 years ago21,051
- 40 or more years ago16,155
Source: Dmand AI Professional Profile Data
Every US 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 US 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 US practice address.
FAQ
Frequently asked questions about internists in the US
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 the US?
153,916 internists have an active NPI, a US practice address and internal medicine (taxonomy code 207R00000X) as their primary specialty. 123,342 of them are linked to a hospital or medical group.
Which state has the most internists?
California, with 18,948, followed by New York with 11,586 and Florida with 10,075.
Which medical groups have the most internists?
The Permanente Medical Group, Inc., with 2,070, followed by Southern California Permanente Medical Group with 1,792 and Sound Physicians with 1,397.
Which hospitals have the most internists?
Brigham and Women's Hospital, with 1,096 affiliated internists, followed by Massachusetts General Hospital with 1,072 and Beth Israel Deaconess Medical Center with 787.
How many US internists finished medical school 30 or more years ago?
37,206 of the 106,452 with a graduation year on file, or 35%. 19,436 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.
Dmand AI
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