Diagnostic Radiology Physician: how many are there, and how many are in private practice?

National totals

What this specialty covers

A radiologist who utilizes x-ray, radionuclides, ultrasound and electromagnetic radiation to diagnose and treat disease.

Reading the sole-proprietor share

For Diagnostic Radiology Physician, 5,171 of 48,056 active records, or 10.8%, are flagged as sole proprietors in NPPES. The flag is a self-reported NPPES field and is an imperfect proxy for private practice because it describes an NPI record's registration status, not necessarily the physician's employment model, ownership, or practice setting.

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.
• NPPES records can be updated, corrected, or deactivated, so these figures are a snapshot of active records.
• NPI records are not automatically a one-to-one measure of people, practices, or clinical activity.
• A primary taxonomy is a registry classification and may not capture every service or specialty a provider offers.
• 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