Radiation Oncology Physician
8,793 active US providers register Radiation Oncology Physician as their primary taxonomy. That is 0.09% of every provider in the registry, and the 144th largest of 584 specialties with a page here.
- Taxonomy code
- 2085R0001X
- Grouping
- Allopathic & Osteopathic Physicians
- Classification
- Radiology
- Specialization
- Radiation Oncology
- Active providers
- 8,793
- States covered
- 51 of 51
What the code means
A radiologist who deals with the therapeutic applications of radiant energy and its modifiers and the study and management of disease, especially malignant tumors.
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 | 940 | |
| Florida | 726 | |
| Texas | 568 | |
| New York | 559 | |
| Pennsylvania | 486 | |
| Ohio | 357 | |
| Illinois | 343 | |
| Michigan | 302 | |
| North Carolina | 274 | |
| Massachusetts | 267 | |
| New Jersey | 245 | |
| Washington | 222 | |
| Georgia | 220 | |
| Indiana | 201 | |
| Arizona | 185 |
Showing the 15 largest of 51 states with at least one.
Who registers under this code
6,894 of these are people and 1,899 are organisations, so 22% of the code is businesses rather than clinicians. Half of them had registered by 2007, and 455 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.
- NEW YORK, NY172
- HOUSTON, TX170
- BOSTON, MA150
- PHILADELPHIA, PA137
- LOS ANGELES, CA105
- SEATTLE, WA101
- CHICAGO, IL97
- ROCHESTER, MN83
- JACKSONVILLE, FL76
- COLUMBUS, OH75
What else they list
Providers whose primary code is Radiation Oncology 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 | 567 | 6.4% |
| Internal Medicine Physician | 259 | 2.9% |
| Therapeutic Radiology Physician | 219 | 2.5% |
| Specialist | 145 | 1.6% |
| Diagnostic Radiology Physician | 88 | 1.0% |
| Hematology & Oncology Physician | 83 | 0.9% |
| Medical Oncology Physician | 60 | 0.7% |
| General Practice Physician | 33 | 0.4% |
Nearby specialties
Other taxonomies NUCC files under Radiology.
- Vascular & Interventional Radiology Physician5,785
- Neuroradiology Physician1,801
- Body Imaging Physician1,310
- Pediatric Radiology Physician1,026
- Diagnostic Ultrasound Physician1,004
- Nuclear Radiology Physician511
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.