Radiation Oncologists in Washington
Data updated monthly · Last refresh October 2026
200 Radiation Oncology providers practice in Washington, including 80 (40%) offering telehealth. The largest concentration is in Seattle. 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.
200providers
80telehealth
Seattletop city
Radiation Oncology by city in Washington
Choose a city to see providers there.
Radiation Oncology providers in Washington
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. Yolanda Tseng, MDSeattle, WA · No drug or device payments recorded (2025) · Telehealth ·
(206) 306-2804 Dr. Marie Taylor, MDSequim, WA · No drug or device payments recorded (2025) ·
(360) 683-9895 Dr. Phoebus Sun Cao, MDSequim, WA · No drug or device payments recorded (2025) ·
(360) 683-9895 Dr. Susan Feeney, MDSequim, WA · No drug or device payments recorded (2025) ·
(360) 683-9895 Dr. Robyn Vera, DOSilverdale, WA · No drug or device payments recorded (2025) ·
(564) 240-3100 Dr. Thomas Mullen, MD, PHDSilverdale, WA · $16 in drug and device payments (2025) ·
(564) 240-3100 Dr. Bryan Ager, MDSpokane, WA · $1,991 in drug and device payments (2025) · Telehealth ·
(509) 228-1000 Dr. Linda Grossheim, MDSpokane, WA · $138 in drug and device payments (2025) ·
(509) 755-5783 Dr. Paula Schomberg, M.D.Spokane, WA · No drug or device payments recorded (2025) ·
(509) 228-1000 Dr. Stephen Thatcher, M.D.Spokane, WA · $133 in drug and device payments (2025) · Telehealth ·
(509) 228-1000 Dr. Susan Laing, MDSpokane, WA · $150 in drug and device payments (2025) ·
(509) 228-1000 Dr. Zachary Guss, MDSpokane, WA · No drug or device payments recorded (2025) · Telehealth ·
(509) 755-5783 Dr. Christopher Lee, M.D.Spokane Valley, WA · $15,706 in drug and device payments (2025) ·
(509) 228-1000 Dr. David Davenport, MDSpokane Valley, WA · No drug or device payments recorded (2025) ·
(509) 228-1000 Dr. John Shaw, MDSpokane Valley, WA · No drug or device payments recorded (2025) ·
(509) 838-2531 Dr. Karie-lynn Kelly, M.D.. F.R.C.P.C.Spokane Valley, WA · $117 in drug and device payments (2025) · Telehealth ·
(509) 462-2273 Dr. Lisa Maestas, D.O.Spokane Valley, WA · No drug or device payments recorded (2025) ·
(509) 838-2531 Dr. Michael Kos, MDSpokane Valley, WA · $152 in drug and device payments (2025) ·
(509) 321-4980 Dr. Robin Smith, MDSpokane Valley, WA · $279 in drug and device payments (2025) ·
(509) 838-2531 Dr. Wayne Lamoreaux, M.D.Spokane Valley, WA · $491 in drug and device payments (2025) ·
(509) 228-1000 Dr. Andrew Graff, DOTacoma, WA · No drug or device payments recorded (2025) ·
(253) 968-2252 Dr. Christopher Premo, MDTacoma, WA · No drug or device payments recorded (2025) · Telehealth ·
(707) 631-0594 Dr. Delnora Erickson, M.D.Tacoma, WA · No drug or device payments recorded (2025) ·
(253) 968-2252 Dr. Herbert Wang, MDTacoma, WA · $363 in drug and device payments (2025) · Telehealth ·
(253) 272-1077 Dr. Joseph Tsai, MD, PHDTacoma, WA · No drug or device payments recorded (2025) · Telehealth ·
(253) 403-4994 Dr. Michael Soronen, MDTacoma, WA · No drug or device payments recorded (2025) ·
(253) 627-6172 Dr. Susan Guo, MDTacoma, WA · $148 in drug and device payments (2025) · Telehealth ·
(253) 403-4994 Dr. Wendy Gao, MDTacoma, WA · $261 in drug and device payments (2025) · Telehealth ·
(253) 627-6172 Dr. Carrie Gotkowitz, M.D.Vancouver, WA · No drug or device payments recorded (2025) ·
(360) 944-9889 Dr. Faisal Siddiqui, MD, PHDVancouver, WA · No drug or device payments recorded (2025) ·
(360) 944-9889 Dr. Gurleen Dhami, M.D.Vancouver, WA · $33 in drug and device payments (2025) · Telehealth ·
(360) 514-1900 Dr. Jamiluddin Qazi, MDVancouver, WA · No drug or device payments recorded (2025) ·
(360) 944-9889 Dr. Scott Schneider, M.D.Vancouver, WA · $5,038 in drug and device payments (2025) ·
(360) 944-9889 Dr. Shushan Rana, MDVancouver, WA · $33 in drug and device payments (2025) ·
(360) 514-1900 Dr. Stephen Hoffelt, MDVancouver, WA · $32 in drug and device payments (2025) ·
(360) 514-1900 Dr. Won Lee, M.D.Vancouver, WA · No drug or device payments recorded (2025) · Telehealth ·
(360) 487-1700 Dr. Ian Gallaher, MDWalla Walla, WA · $115 in drug and device payments (2025) ·
(509) 897-5700 Dr. Kristen Riegert, MDWalla Walla, WA · $23 in drug and device payments (2025) · Telehealth ·
(509) 897-5700 Dr. John Register, MDWenatchee, WA · $66 in drug and device payments (2025) ·
(509) 663-8711 Dr. Nicolas Kummer, M.D.-PH.D.Wenatchee, WA · No drug or device payments recorded (2025) · Telehealth ·
(509) 663-8711 Dr. Robert Fain, MDWenatchee, WA · No drug or device payments recorded (2025) · Telehealth ·
(509) 663-8711 Dr. Thomas Carlson, MDWenatchee, WA · No drug or device payments recorded (2025) ·
(509) 663-8711 Dr. Sean Cleary, MDYakima, WA · No drug or device payments recorded (2025) ·
(509) 574-3500 Dr. Steven Register, M.D. Common questions
How many Radiation Oncology providers are in Washington?There are 200 Radiation Oncology providers with active NPI records practicing in Washington, according to federal NPPES data refreshed monthly.
Do Radiation Oncology providers in Washington offer telehealth?Yes. 80 of the 200 Radiation Oncology providers in Washington (about 40%) report offering telehealth services in CMS data.
Which cities in Washington have the most Radiation Oncology providers?Seattle (97), Tacoma (10), Vancouver (8) have the highest concentration of Radiation Oncology providers in Washington.
How many Radiation Oncology providers in Washington received drug or device company payments?89 of 200 Radiation Oncology providers in Washington (45%) 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 Washington work in independent practices or large health systems?Among 128 Radiation Oncologists in Washington enrolled in Medicare, 18% bill through a solo or small practice with fewer than 10 clinicians, 18% through a mid-size group of 10 to 99, and 64% through a large group or health system with 100 or more clinicians, according to CMS enrollment records.
Which hospitals do Radiation Oncologists in Washington work at?According to CMS facility affiliation records, the Washington hospitals where the most Radiation Oncologists hold privileges are University of Washington Medical Ctr in Seattle; Swedish Medical Center in Seattle; Tacoma General Allenmore Hospital in Tacoma.
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