Radiation Oncologists in California
Data updated monthly · Last refresh October 2026
734 Radiation Oncology providers practice in California, including 310 (42%) offering telehealth. The largest concentration is in Los Angeles. 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.
734providers
310telehealth
Los Angelestop city
Radiation Oncology by city in California
Choose a city to see providers there.
Radiation Oncology providers in California
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. Sukhjeet Batth, M.D.Fresno, CA · $1,253 in drug and device payments (2025) · Telehealth ·
(559) 326-1222 Dr. Uma Swamy, MDFresno, CA · $1,644 in drug and device payments (2025) · Telehealth ·
(559) 457-4050 Dr. William Podolsky, M.D., PH.D Dr. Dechen Dolkar, MDFullerton, CA · $175 in drug and device payments (2025) · Telehealth ·
(714) 446-5632 Dr. Leonard Farber, M.D.Fullerton, CA · $283 in drug and device payments (2025) ·
(714) 446-5632 Dr. Tommy Sheu, MDFullerton, CA · $239 in drug and device payments (2025) ·
(714) 446-5632 Dr. Young Lee, M.D.Fullerton, CA · No drug or device payments recorded (2025) ·
(714) 446-5632 Dr. Ravichandran Ramakrishnan, MD Dr. Jekwon Yeh, MDGlendale, CA · $86 in drug and device payments (2025) · Telehealth ·
(818) 409-8198 Dr. Linas Kazlauskas, MDGlendale, CA · No drug or device payments recorded (2025) ·
(818) 500-5885 Dr. Sundera Ariathurai, M.D.Glendale, CA · No drug or device payments recorded (2025) ·
(818) 500-5885 Dr. Clayton Hess, MDGrass Valley, CA · No drug or device payments recorded (2025) · Telehealth ·
(530) 274-6600 Dr. David Kraus, MDGrass Valley, CA · $17 in drug and device payments (2025) ·
(530) 274-6600 Dr. Richard Evans, MDGrass Valley, CA · No drug or device payments recorded (2025) ·
(530) 274-6000 Dr. Ernest Torigoe, MDGreenbrae, CA · No drug or device payments recorded (2025) ·
(209) 342-2300 Dr. Francine Halberg, MDGreenbrae, CA · No drug or device payments recorded (2025) ·
(209) 342-2300 Dr. Joseph Poen, MDGreenbrae, CA · No drug or device payments recorded (2025) · Telehealth ·
(209) 342-2300 Dr. Leah King, RNGreenbrae, CA · No drug or device payments recorded (2025) ·
(415) 925-7911 Dr. Lloyd Miyawaki, MDGreenbrae, CA · $16 in drug and device payments (2025) · Telehealth ·
(209) 342-2300 Dr. Amanda Schwer, MDIrvine, CA · $126 in drug and device payments (2025) · Telehealth ·
(949) 671-4673 Dr. Colton Ladbury, MDIrvine, CA · $613 in drug and device payments (2025) · Telehealth ·
(949) 671-4673 Dr. Julius Weng, M.D.Irvine, CA · No drug or device payments recorded (2025) · Telehealth ·
(949) 671-4673 Dr. Kenneth Tokita, M.D.Irvine, CA · $349 in drug and device payments (2025) · Telehealth ·
(949) 417-1100 Dr. Percy Lee, M.D.Irvine, CA · $36,827 in drug and device payments (2025) · Telehealth ·
(626) 256-4673 Dr. Selamawit Negusse, MDIrvine, CA · $154 in drug and device payments (2025) · Telehealth ·
(949) 417-1100 Dr. Andrew Zhang, MDLaguna Hills, CA · $60 in drug and device payments (2025) ·
(949) 452-8880 Dr. Joel Cherlow, M.D., PH.D.Laguna Hills, CA · No drug or device payments recorded (2025) ·
(949) 452-7888 Dr. Linda Chan, M.D.Laguna Hills, CA · $72 in drug and device payments (2025) · Telehealth ·
(949) 452-8880 Dr. Robert Kwon, MDLaguna Hills, CA · $116 in drug and device payments (2025) ·
(949) 452-8880 Dr. John Loh, M.D.Laguna Woods, CA · No drug or device payments recorded (2025) ·
(315) 491-3997 Dr. Ajay Pal Sandhu, M.D.La Jolla, CA · $194 in drug and device payments (2025) · Telehealth ·
(858) 822-6055 Dr. Brent Rose, M.D.La Jolla, CA · $422 in drug and device payments (2025) · Telehealth ·
(619) 341-3899 Dr. Catheryn Yashar, M.DLa Jolla, CA · No drug or device payments recorded (2025) ·
(858) 822-6055 Dr. Chien Chen, M.D., PH.D.La Jolla, CA · $1,035 in drug and device payments (2025) · Telehealth ·
(415) 971-9313 Dr. Cynthia Chasan, MDLa Jolla, CA · No drug or device payments recorded (2025) ·
(858) 395-5760 Dr. Daniel Simpson, M.D.La Jolla, CA · No drug or device payments recorded (2025) · Telehealth ·
(858) 822-6040 Dr. David Hodgens, M.D.La Jolla, CA · No drug or device payments recorded (2025) ·
(858) 626-6864 Dr. James Murphy, MDLa Jolla, CA · No drug or device payments recorded (2025) ·
(858) 822-6040 Dr. Jean Mefferd, M.D.La Jolla, CA · No drug or device payments recorded (2025) ·
(858) 626-6864 Dr. Jona Hattangadi-gluth, MDLa Jolla, CA · $55 in drug and device payments (2025) · Telehealth ·
(858) 822-6040 Dr. Kevin Murphy, M.D.La Jolla, CA · No drug or device payments recorded (2025) ·
(858) 822-6046 Dr. Loren Mell, M.D.La Jolla, CA · $13,992 in drug and device payments (2025) · Telehealth ·
(858) 822-6040 Dr. Ray Lin, M.D.La Jolla, CA · $1,216 in drug and device payments (2025) · Telehealth ·
(858) 554-2000 Dr. Stephen Seagren, M.D.La Jolla, CA · No drug or device payments recorded (2025) ·
(585) 822-6040 Dr. Sunil Advani, M.D.La Jolla, CA · $23 in drug and device payments (2025) · Telehealth ·
(858) 822-4364 Dr. Barry Uhl, MDLa Mesa, CA · $2,546 in drug and device payments (2025) ·
(619) 740-4500 Dr. Kelly Dewitt, MDLa Mesa, CA · $1,691 in drug and device payments (2025) ·
(619) 740-4500 Dr. Sunanda Pejavar, M.D. Dr. Boryana Eastman, M.D., PH.D.Lancaster, CA · No drug or device payments recorded (2025) · Telehealth ·
(661) 902-5600 Common questions
How many Radiation Oncology providers are in California?There are 734 Radiation Oncology providers with active NPI records practicing in California, according to federal NPPES data refreshed monthly.
Do Radiation Oncology providers in California offer telehealth?Yes. 310 of the 734 Radiation Oncology providers in California (about 42%) report offering telehealth services in CMS data.
Which cities in California have the most Radiation Oncology providers?Los Angeles (97), San Francisco (46), Stanford (43) have the highest concentration of Radiation Oncology providers in California.
How many Radiation Oncology providers in California received drug or device company payments?359 of 734 Radiation Oncology providers in California (49%) 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 California work in independent practices or large health systems?Among 516 Radiation Oncologists in California enrolled in Medicare, 16% bill through a solo or small practice with fewer than 10 clinicians, 17% through a mid-size group of 10 to 99, and 67% through a large group or health system with 100 or more clinicians, according to CMS enrollment records.
Which hospitals do Radiation Oncologists in California work at?According to CMS facility affiliation records, the California hospitals where the most Radiation Oncologists hold privileges are UCSF Medical Center in San Francisco; Stanford Health Care in Stanford; UC San Diego Health Hillcrest - Hillcrest Med Ctr in San Diego.
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