Radiation Oncologists in Wisconsin
Data updated monthly · Last refresh October 2026
153 Radiation Oncology providers practice in Wisconsin, including 50 (33%) offering telehealth. The largest concentration is in Milwaukee. Profiles include federal Open Payments records of money received from drug and device companies in 2025. Listings are drawn from federal public records and are not endorsements.
153providers
50telehealth
Milwaukeetop city
Radiation Oncology by city in Wisconsin
Choose a city to see providers there.
Where Radiation Oncologists in Wisconsin practice
From CMS Medicare enrollment records covering 101 of the 153 providers listed here (66%). Providers who do not bill Medicare are not included in these figures.
8%solo or small practice (under 10 clinicians)
20%mid-size group (10 to 99)
72%large group or health system (100+)
Largest practice groups
| Group (as registered with Medicare) | Radiation Oncologists | All clinicians in group | Main city |
| Radiation Oncology Associates LTD | 20 | 23 | Milwaukee |
| The Medical College of Wisconsin Inc. | 19 | 2,092 | Milwaukee |
| University of Wisconsin Medical Foundation Inc. | 18 | 2,537 | Madison |
| Mchs Hospitals Inc. | 7 | 1,195 | Marshfield |
| Shared Magnetic Resonance Imaging Facility Inc. | 7 | 9 | Madison |
Hospitals where they hold privileges
| Hospital | City | Ownership | CMS star rating | Radiation Oncologists affiliated |
| Froedtert Memorial Lutheran Hospital | Milwaukee | Nonprofit | 3 of 5 | 20 |
| University of Wi Hospitals & Clinics Authority | Madison | Government | 5 of 5 | 19 |
| Aurora St Lukes Medical Center | Milwaukee | Nonprofit | 4 of 5 | 13 |
| Aurora Baycare Medical Ctr | Green Bay | For-profit | 4 of 5 | 9 |
| Ascension Ne Wisconsin - St Elizabeth Campus | Appleton | Nonprofit | 4 of 5 | 9 |
Sources: CMS Doctors and Clinicians (August 2026) and Facility Affiliation files (August 2026); hospital ownership type and overall star rating from CMS Hospital General Information (July 2026). A clinician in several groups is counted once, in the largest group they bill through. Ownership type is what the hospital reports to CMS; it does not show private equity or other investor ownership. How we build this directory.
Radiation Oncology providers in Wisconsin
Listed by city, largest first. 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. Carol Grabowski, MDAppleton, WI · No drug or device payments recorded (2025) ·
(920) 749-1171 Dr. Douglas Calvin, M.D.Appleton, WI · $209 in drug and device payments (2025) ·
(920) 749-1171 Dr. Michael Ray, MD PHDAppleton, WI · No drug or device payments recorded (2025) ·
(920) 738-6340 Dr. Nathan Munson, M.D.Appleton, WI · No drug or device payments recorded (2025) ·
(920) 738-6340 Dr. Sara Beltran Ponce, MDAppleton, WI · No drug or device payments recorded (2025) ·
(920) 831-8900 Dr. John Boyle, M.D.Ashland, WI · No drug or device payments recorded (2025) ·
(715) 682-8183 Dr. Kevin Kozak, MD, PHDBaraboo, WI · No drug or device payments recorded (2025) · Telehealth ·
(608) 356-1400 Dr. Vera Nigrin, MDBaraboo, WI · No drug or device payments recorded (2025) · Telehealth ·
(608) 356-1400 Dr. Eric Xanthopoulos, MD Dr. Shannon Offerman, MDBrookfield, WI · $18 in drug and device payments (2025) ·
(262) 780-4100 Dr. Stuart Blacher, MDBrookfield, WI · No drug or device payments recorded (2025) ·
(414) 447-2221 Dr. Mark Steinmetz, M.D.Chippewa Falls, WI · No drug or device payments recorded (2025) ·
(715) 829-3448 Dr. James Baer, MDEau Claire, WI · $47 in drug and device payments (2025) ·
(715) 838-5222 Dr. Kenneth Klein, MDEau Claire, WI · $23 in drug and device payments (2025) ·
(715) 717-4121 Dr. Now Bahar Alam, MDEau Claire, WI · No drug or device payments recorded (2025) ·
(715) 838-5222 Dr. Zachary Wilson, M.D.Eau Claire, WI · $72 in drug and device payments (2025) ·
(715) 838-5222 Dr. Marcia Richards, M.D.Elm Grove, WI · No drug or device payments recorded (2025) ·
(262) 827-9888 Dr. Filip Troicki, MDFond Du Lac, WI · No drug or device payments recorded (2025) ·
(920) 926-4100 Dr. Hong Wang, M.D.Fond Du Lac, WI · No drug or device payments recorded (2025) ·
(920) 926-4101 Dr. Michael Vander Kooy, M.D.Fond Du Lac, WI · No drug or device payments recorded (2025) ·
(920) 926-4100 Dr. Michael Christensen, M.D.Franklin, WI · No drug or device payments recorded (2025) ·
(262) 994-1952 Dr. Oh Hoon Kwon, MDFranklin, WI · $27 in drug and device payments (2025) ·
(414) 427-6230 Dr. Perry Gould, MDGrafton, WI · No drug or device payments recorded (2025) · Telehealth ·
(262) 329-5120 Dr. William Pao, MDGrafton, WI · No drug or device payments recorded (2025) ·
(262) 329-5000 Dr. Adam Liss, MDGreen Bay, WI · No drug or device payments recorded (2025) · Telehealth ·
(920) 435-8326 Dr. Alex Coffman, MDGreen Bay, WI · No drug or device payments recorded (2025) ·
(920) 884-3135 Dr. Daniel Hong, MDGreen Bay, WI · $390 in drug and device payments (2025) ·
(920) 288-4160 Dr. David Rohde, MDGreen Bay, WI · No drug or device payments recorded (2025) ·
(920) 288-4160 Dr. Linda Gemer, MDGreen Bay, WI · $622 in drug and device payments (2025) ·
(920) 621-2354 Dr. Michael Guiou, M.D.Green Bay, WI · No drug or device payments recorded (2025) ·
(920) 884-3135 Dr. Pamela Vanderwall, MDGreen Bay, WI · No drug or device payments recorded (2025) ·
(920) 288-4160 Dr. Sally Schlise, MDGreen Bay, WI · No drug or device payments recorded (2025) ·
(920) 433-8184 Dr. Jonathan Lubin, MDJanesville, WI · $30 in drug and device payments (2025) · Telehealth ·
(608) 373-8600 Dr. Nicholas Rydzewski, MDJanesville, WI · No drug or device payments recorded (2025) ·
(608) 756-6731 Dr. E Czyzewski, MDJohnson Creek, WI · No drug or device payments recorded (2025) ·
(920) 699-3500 Dr. Jessica Schuster, MDJohnson Creek, WI · $976 in drug and device payments (2025) · Telehealth ·
(920) 699-3500 Dr. Joshua Elson, MD, MPHKenosha, WI · No drug or device payments recorded (2025) ·
(262) 857-5750 Dr. Kevin Khater, MD, PHD Dr. Peter Hulick, M.D.Kenosha, WI · No drug or device payments recorded (2025) ·
(617) 312-9747 Dr. Collin Driscoll, M.D.La Crosse, WI · No drug or device payments recorded (2025) · Telehealth ·
(608) 782-7300 Dr. Cooper Rapp, M.D.La Crosse, WI · $107 in drug and device payments (2025) ·
(608) 782-7300 Dr. Douglas Gold, MDLa Crosse, WI · No drug or device payments recorded (2025) ·
(608) 782-7300 Dr. Lindsay Morris, MDLa Crosse, WI · No drug or device payments recorded (2025) · Telehealth ·
(608) 782-7300 Dr. Marcus Crosby, M.D.La Crosse, WI · No drug or device payments recorded (2025) · Telehealth ·
(608) 782-7300 Dr. Muhammad Shuja, MDLa Crosse, WI · No drug or device payments recorded (2025) ·
(608) 785-0940 Dr. Patrick Conway, MDLa Crosse, WI · No drug or device payments recorded (2025) ·
(608) 785-0940 Dr. Adam BurrMadison, WI · No drug or device payments recorded (2025) · Telehealth ·
(608) 263-8500 Dr. Aleksandra Kuczmarska-haas, M.D.Madison, WI · No drug or device payments recorded (2025) · Telehealth ·
(608) 263-6400 Dr. Andrew BaschnagelMadison, WI · No drug or device payments recorded (2025) · Telehealth ·
(608) 263-8500 Common questions
How many Radiation Oncology providers are in Wisconsin?There are 153 Radiation Oncology providers with active NPI records practicing in Wisconsin, according to federal NPPES data refreshed monthly.
Do Radiation Oncology providers in Wisconsin offer telehealth?Yes. 50 of the 153 Radiation Oncology providers in Wisconsin (about 33%) report offering telehealth services in CMS data.
Which cities in Wisconsin have the most Radiation Oncology providers?Milwaukee (40), Madison (38), Green Bay (8) have the highest concentration of Radiation Oncology providers in Wisconsin.
How many Radiation Oncology providers in Wisconsin received drug or device company payments?42 of 153 Radiation Oncology providers in Wisconsin (27%) received at least one payment from a drug or device company in 2025, according to the federal Open Payments program.
Where does this data come from?Provider counts and profiles 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.
Do most Radiation Oncologists in Wisconsin work in independent practices or large health systems?Among 101 Radiation Oncologists in Wisconsin enrolled in Medicare, 8% bill through a solo or small practice with fewer than 10 clinicians, 20% through a mid-size group of 10 to 99, and 72% through a large group or health system with 100 or more clinicians, according to CMS enrollment records.
Which hospitals do Radiation Oncologists in Wisconsin work at?According to CMS facility affiliation records, the Wisconsin hospitals where the most Radiation Oncologists hold privileges are Froedtert Memorial Lutheran Hospital in Milwaukee; University of Wi Hospitals & Clinics Authority in Madison; Aurora St Lukes Medical Center in Milwaukee.
Related reading on HealthcareDiscovery.AI
Radiation Oncology in all 50 states Search all 153 in the directory Ask Zach for help choosing
Related
