Radiation Oncology Physician: how many are there, and how many are in private practice?

National totals

What this specialty covers

A radiologist who deals with the therapeutic applications of radiant energy and its modifiers and the study and management of disease, especially malignant tumors.

Reading the sole-proprietor share

For this specialty, 776 records, or 9.8%, are flagged as sole proprietors in NPPES. Because that flag is a self-reported NPPES field, it is an imperfect proxy for private practice and does not show every physician's ownership or employment arrangement.

By state

New NPI registrations by year

Counts reflect the year each NPI was first issued, among records still active today. The final year is partial: this data covers through 2026-01-11.

Data notes

• The sole-proprietor field is self-reported by the provider in NPPES and is an imperfect proxy for private practice.
• A sole-proprietor count shown as <11 is suppressed: the true value is below 11, which could include zero.
• - These are active NPI records with this specialty as the primary taxonomy, so they are not a direct measure of clinical activity, patient volume, or staffing.
• - State location and first-enumeration year describe NPPES registration details and do not necessarily indicate every practice location or when specialty practice began.
• Providers are counted once, by their primary taxonomy code only.

Source: CMS National Plan and Provider Enumeration System (NPPES) Data Dissemination file, FOIA-disclosable public data under CMS-6060-N. Aggregated by Hero EMR on 2026-08-03; deactivated NPIs excluded; specialty assigned from the primary taxonomy code (NUCC 25.1). Counts below 11 are suppressed. Individual providers are never published. All provider data pages.

Common questions