Hematology (Internal Medicine) Physician
1,572 active US providers register Hematology (Internal Medicine) Physician as their primary taxonomy. That is 0.02% of every provider in the registry, and the 329th largest of 584 specialties with a page here.
- Taxonomy code
- 207RH0000X
- Grouping
- Allopathic & Osteopathic Physicians
- Classification
- Internal Medicine
- Specialization
- Hematology
- Active providers
- 1,572
- States covered
- 49 of 51
What the code means
An internist with additional training who specializes in diseases of the blood, spleen and lymph. This specialist treats conditions such as anemia, clotting disorders, sickle cell disease, hemophilia, leukemia and lymphoma.
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 | 179 | |
| New York | 175 | |
| Minnesota | 130 | |
| Massachusetts | 115 | |
| Ohio | 90 | |
| Texas | 80 | |
| North Carolina | 77 | |
| Pennsylvania | 74 | |
| Florida | 69 | |
| Michigan | 62 | |
| Illinois | 50 | |
| Maryland | 41 | |
| New Jersey | 39 | |
| Washington | 36 | |
| Oregon | 32 |
Showing the 15 largest of 49 states with at least one.
Who registers under this code
1,474 of these are people and 98 are organisations, so 6% of the code is businesses rather than clinicians. Half of them had registered by 2007, and 76 registered in the last five years, 5% of the current population.
That is a slow-growing code, which usually means an established field replacing retirements rather than expanding.
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.
- ROCHESTER, MN108
- NEW YORK, NY88
- BOSTON, MA88
- COLUMBUS, OH69
- DUARTE, CA61
- HOUSTON, TX49
- STANFORD, CA44
- PHILADELPHIA, PA40
- CHARLOTTE, NC35
- ANN ARBOR, MI35
What else they list
Providers whose primary code is Hematology (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 |
|---|---|---|
| Internal Medicine Physician | 519 | 33.0% |
| Hematology & Oncology Physician | 443 | 28.2% |
| Medical Oncology Physician | 338 | 21.5% |
| Student in an Organized Health Care Education/Training Program | 105 | 6.7% |
| Hospitalist Physician | 29 | 1.8% |
| Blood Banking & Transfusion Medicine Physician | 9 | 0.6% |
| Pediatrics Physician | 9 | 0.6% |
| Anatomic Pathology & Clinical Pathology Physician | 8 | 0.5% |
Nearby specialties
Other taxonomies NUCC files under Internal Medicine.
- Advanced Heart Failure and Transplant Cardiology Physician1,232
- Sleep Medicine (Internal Medicine) Physician1,955
- Addiction Medicine (Internal Medicine) Physician1,040
- Allergy & Immunology (Internal Medicine) Physician742
- Sports Medicine (Internal Medicine) Physician485
- Adolescent Medicine (Internal Medicine) Physician398
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.