Internal Medicine Physician
191,393 active US providers register Internal Medicine Physician as their primary taxonomy. That is 2.1% of every provider in the registry, and the 10th largest of 584 specialties with a page here.
- Taxonomy code
- 207R00000X
- Grouping
- Allopathic & Osteopathic Physicians
- Classification
- Internal Medicine
- Active providers
- 191,393
- States covered
- 51 of 51
What the code means
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Definition quoted verbatim from the NUCC Health Care Provider Taxonomy code set, version 25.1. Not paraphrased.
Where they are
Counted by practice location, not by mailing address or by licence state. A provider practising across a state line is counted where they practise.
| State | Providers | Share |
|---|---|---|
| California | 21,938 | |
| New York | 15,512 | |
| Florida | 15,209 | |
| Texas | 12,469 | |
| Illinois | 9,069 | |
| Pennsylvania | 9,060 | |
| Michigan | 7,711 | |
| Massachusetts | 7,654 | |
| New Jersey | 6,630 | |
| Ohio | 6,475 | |
| Maryland | 5,615 | |
| North Carolina | 5,256 | |
| Georgia | 5,096 | |
| Virginia | 4,593 | |
| Arizona | 3,727 |
Showing the 15 largest of 51 states with at least one.
Who registers under this code
149,770 of these are people and 41,623 are organisations, so 22% of the code is businesses rather than clinicians. Half of them had registered by 2008, and 26,928 registered in the last five years, 14% of the current population.
That is close to the pace of the registry as a whole.
Where the practices are
By practice-location city. City counts are noisier than state counts, because a large employer files one address for many providers.
- CHICAGO, IL3,349
- NEW YORK, NY2,973
- BOSTON, MA2,369
- PHILADELPHIA, PA2,083
- BROOKLYN, NY2,069
- HOUSTON, TX1,963
- LOS ANGELES, CA1,771
- BALTIMORE, MD1,550
- SAN FRANCISCO, CA1,448
- MIAMI, FL1,265
What else they list
Providers whose primary code is Internal Medicine Physician most often carry these secondary taxonomies as well. This is the closest thing the registry has to a map of which specialties overlap in practice, and it is not published anywhere else.
| Also listed | Providers | Share |
|---|---|---|
| Student in an Organized Health Care Education/Training Program | 14,672 | 7.7% |
| Hospitalist Physician | 10,635 | 5.6% |
| Pediatrics Physician | 5,887 | 3.1% |
| Family Medicine Physician | 4,250 | 2.2% |
| Geriatric Medicine (Internal Medicine) Physician | 1,782 | 0.9% |
| Emergency Medicine Physician | 1,728 | 0.9% |
| Pulmonary Disease Physician | 1,624 | 0.8% |
| Cardiovascular Disease Physician | 1,564 | 0.8% |
Nearby specialties
Other taxonomies NUCC files under Internal Medicine.
- Cardiovascular Disease Physician36,376
- Gastroenterology Physician26,110
- Pulmonary Disease Physician19,624
- Nephrology Physician17,538
- Hematology & Oncology Physician17,524
- Infectious Disease Physician13,206
Looking up a specific provider
These counts come from the monthly NPPES file. To check one provider, use their NPI: the lookup reads the live registry and shows whether the identifier is still active, which the monthly file cannot tell you about the last few weeks.
Counts from npidata_pfile_20050523-20260712.csv, built 2026-08-09. Primary taxonomy only, deactivated identifiers excluded.