NPPES file of Aug 9, 2026

Diagnostic Radiology Physician vs Radiation Oncology Physician

Diagnostic Radiology Physician has 6.4 times as many registry records as Radiation Oncology Physician: 44,301 against 6,915. Each count is the NPPES records whose primary taxonomy is the specialty, so it measures how providers describe their main practice, not everyone trained in it.

CMS NPPES, file of Aug 9, 2026; 2023 Census population estimates · method

Diagnostic Radiology Physician: 44,301 records in 56 states

  1. California4,500
  2. New York3,146
  3. Texas3,124
  4. Florida2,761
  5. Pennsylvania2,199

Diagnostic Radiology Physician nationwide →

Radiation Oncology Physician: 6,915 records in 53 states

  1. California735
  2. Florida520
  3. New York449
  4. Texas449
  5. Pennsylvania383

Radiation Oncology Physician nationwide →

By state, with records per 100,000 residents

StateDiagnostic Radiology PhysicianRadiation Oncology PhysicianPer 100,000 (first)Per 100,000 (second)
California4,50073511.51.9
New York3,14644916.12.3
Texas3,12444910.21.5
Florida2,76152012.22.3
Pennsylvania2,19938317.03.0
Illinois1,87427714.92.2
Massachusetts1,65824123.73.4
Ohio1,58229813.42.5
Minnesota1,70016029.62.8
Michigan1,58423915.82.4
North Carolina1,38923012.82.1
Virginia1,15813713.41.6
New Jersey1,10215311.91.6
Georgia1,0651809.71.6
Washington1,04119813.32.5
Wisconsin1,00515317.02.6
Missouri97613615.82.2
Tennessee96813213.61.9
Arizona86915611.72.1
Maryland87712414.22.0
Indiana77913511.42.0
Colorado79611113.51.9
Connecticut6198217.12.3
Oregon52211512.32.7
Alabama5508010.81.6
South Carolina517809.61.5
Louisiana5066611.11.4
Kentucky4778810.51.9
Oklahoma4045610.01.4
Iowa3646711.42.1
Utah327629.61.8
Kansas3126810.62.3
Nevada310459.71.4
Arkansas297499.71.6
Mississippi247418.41.4
Nebraska2453712.41.9
New Mexico2352611.11.2
New Hampshire2014014.32.9
Idaho2122510.81.3
West Virginia1993711.22.1
Maine1822713.01.9
Rhode Island1772916.22.6
District of Columbia1722625.33.8
Hawaii1662811.62.0
Delaware1241912.01.8
Montana108249.52.1
North Dakota1062313.52.9
South Dakota1062211.52.4
Alaska881512.02.0
Vermont841413.02.2
Wyoming5779.81.2

Source: CMS NPPES (NPPES files on CMS.gov), primary NUCC taxonomy by practice state; 2023 population estimates (census.gov).

Common questions

How many Diagnostic Radiology Physician providers are there vs Radiation Oncology Physician?

There are 44,301 Diagnostic Radiology Physician and 6,915 Radiation Oncology Physician records in the CMS NPPES registry, counted by primary taxonomy.

Which specialty is spread across more states?

Diagnostic Radiology Physician has records in 56 states and territories, against 53.

Where is the data from?

Provider counts are from the CMS National Plan and Provider Enumeration System (NPPES). Per-capita rates use 2023 Census population estimates.

Two specialties are not substitutes: scope of practice, training and the conditions treated differ. More comparisons →

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of the NPPES file of Aug 9, 2026.