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Diagnostic Radiology in Mason City, Iowa

Data updated monthly · Last refresh September 2026

16 Diagnostic Radiology providers practice in Mason City. Listings are drawn from federal public records and are not endorsements.

Diagnostic Radiology providers in Mason City

Listed alphabetically. Payment figures come from the federal Open Payments program, which requires drug and device companies to report what they pay physicians for consulting, speaking, meals, travel and royalties. A disclosed payment is a financial relationship, not evidence of wrongdoing, and many totals reflect a single meal. Figures cover calendar year 2025.

Dr. Brad Janson, M.D.
Mason City, IA · No drug or device payments recorded (2025) · (641) 424-0102
Dr. Brett Castek, R.T.(R)(MR)(ARRT)
Mason City, IA · No drug or device payments recorded (2025) · (641) 494-5000
Dr. Bryan Navarette, M.D., M.P.H.
Mason City, IA · $260 in drug and device payments (2025) · (641) 424-0102
Dr. Gary Swenson, M.D.
Mason City, IA · No drug or device payments recorded (2025) · (641) 424-0102
Dr. Hubert Oakley, M.D.
Mason City, IA · No drug or device payments recorded (2025) · (641) 424-0102
Dr. Jackson Herzog
Mason City, IA · No drug or device payments recorded (2025) · (641) 424-0102
Dr. Jeana Petree, M.D.
Mason City, IA · $459 in drug and device payments (2025) · (641) 424-0102
Dr. Joseph Ocel, M.D.
Mason City, IA · No drug or device payments recorded (2025) · (641) 424-0102
Dr. Kristin White, M.D.
Mason City, IA · No drug or device payments recorded (2025) · (641) 424-0102
Dr. Michael Dunlay
Mason City, IA · No drug or device payments recorded (2025) · (641) 428-7000
Dr. Robert Berg, MD
Mason City, IA · No drug or device payments recorded (2025) · (641) 424-0102
Dr. Ryan Holthaus, M.D.
Mason City, IA · $72 in drug and device payments (2025) · (641) 424-0102
Dr. Ryan Smith, M.D.
Mason City, IA · No drug or device payments recorded (2025) · (641) 424-0102
Dr. Santosh Shah, MD
Mason City, IA · $14 in drug and device payments (2025) · (641) 428-7000
Dr. Timothy Lucas, M.D.
Mason City, IA · $21 in drug and device payments (2025) · (641) 424-0102
Dr. William Matthews, M.D.
Mason City, IA · No drug or device payments recorded (2025) · (641) 424-0102

Common questions

How many Diagnostic Radiology providers are in Mason City, Iowa?

There are 16 Diagnostic Radiology providers with active NPI records practicing in Mason City, according to federal NPPES data refreshed monthly.

Where does this data come from?

Provider records come from the federal NPPES registry and CMS Doctors and Clinicians files. Payment figures come from the CMS Open Payments program for calendar year 2025. The directory refreshes monthly.

All specialties in Mason City Diagnostic Radiology across Iowa

Try a city like Tucson, a zip like 85016, or a specialty like psychiatry. For a doctor by name, use the full search.
Sources: NPPES (CMS), Doctors and Clinicians national files, CMS Open Payments 2025. Updated monthly. Records are public federal data and are not verified credentials, licensure checks, or endorsements. This directory is informational and not medical advice. How we build this directory.