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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 in Los Angeles97 providers
Radiation Oncology in San Francisco46 providers
Radiation Oncology in Stanford43 providers
Radiation Oncology in San Diego43 providers
Radiation Oncology in Sacramento32 providers
Radiation Oncology in Orange19 providers
Radiation Oncology in Duarte16 providers
Radiation Oncology in La Jolla15 providers
Radiation Oncology in Palo Alto14 providers
Radiation Oncology in San Jose11 providers
Radiation Oncology in Loma Linda11 providers
Radiation Oncology in West Hollywood10 providers
Radiation Oncology in Fresno9 providers
Radiation Oncology in Santa Clara9 providers
Radiation Oncology in Long Beach9 providers
Radiation Oncology in Redding8 providers
Radiation Oncology in Fountain Valley7 providers
Radiation Oncology in Santa Barbara7 providers
Radiation Oncology in Dublin7 providers
Radiation Oncology in Torrance7 providers
Radiation Oncology in Irvine7 providers
Radiation Oncology in Chula Vista6 providers
Radiation Oncology in Newport Beach6 providers
Radiation Oncology in Oakland6 providers

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. Alexander Gottschalk, M.D.
San Francisco, CA · $123 in drug and device payments (2025) · Telehealth · (415) 353-7175
Dr. Alexandra Elena Hotca-cho, MD
San Francisco, CA · $117 in drug and device payments (2025) · Telehealth · (415) 353-7175
Dr. Anna Paulsson, M.D.
San Francisco, CA · $255 in drug and device payments (2025) · Telehealth · (415) 353-7175
Dr. Anthony Wong, MD, PHD
San Francisco, CA · $189 in drug and device payments (2025) · Telehealth · (415) 353-7175
Dr. Barbara Fowble, M.D.
San Francisco, CA · No drug or device payments recorded (2025) · (415) 353-8659
Dr. Barry Chauser, MD
San Francisco, CA · $67 in drug and device payments (2025) · (209) 342-2300
Dr. Catherine Park, M.D.
San Francisco, CA · No drug or device payments recorded (2025) · (415) 353-7175
Dr. David Kornguth, M.D.
San Francisco, CA · $1,935 in drug and device payments (2025) · (415) 541-0800
Dr. David Raleigh, M.D., PH.D.
San Francisco, CA · $1,845 in drug and device payments (2025) · Telehealth · (415) 514-2345
Dr. Emi Yoshida, M.D.
San Francisco, CA · $2,240 in drug and device payments (2025) · Telehealth · (415) 502-1645
Dr. Encouse Golden, MD, PHD
San Francisco, CA · No drug or device payments recorded (2025) · Telehealth · (415) 476-1000
Dr. Harish Vasudevan, MD, PHD
San Francisco, CA · $18 in drug and device payments (2025) · Telehealth · (415) 353-7175
Dr. I-chow Hsu, M.D.
San Francisco, CA · No drug or device payments recorded (2025) · Telehealth · (415) 353-7175
Dr. Jason Chan, M.D.
San Francisco, CA · $120 in drug and device payments (2025) · Telehealth · (415) 353-7175
Dr. Jean Nakamura, M.D.
San Francisco, CA · No drug or device payments recorded (2025) · Telehealth · (415) 353-8900
Dr. Jennifer Yu, MD, PHD
San Francisco, CA · No drug or device payments recorded (2025) · Telehealth · (415) 353-7175
Dr. Jessica Chew
San Francisco, CA · No drug or device payments recorded (2025) · Telehealth · (510) 437-4800
Dr. John Lee, MD
San Francisco, CA · $325 in drug and device payments (2025) · Telehealth · (209) 342-2300
Dr. John Meyer, MD
San Francisco, CA · No drug or device payments recorded (2025) · (209) 342-2300
Dr. Julian Hong, M.D., M.S.
San Francisco, CA · No drug or device payments recorded (2025) · Telehealth · (415) 502-7222
Dr. Kavita Mishra, M.D., M.P.H.
San Francisco, CA · No drug or device payments recorded (2025) · Telehealth · (415) 505-9636
Dr. Lauren Boreta, M.D.
San Francisco, CA · No drug or device payments recorded (2025) · Telehealth · (415) 443-0283
Dr. Lawrence Scala, M.D.
San Francisco, CA · No drug or device payments recorded (2025) · (415) 600-3600
Dr. Lisa Singer
San Francisco, CA · No drug or device payments recorded (2025) · Telehealth · (415) 373-7175
Dr. Mary Feng, M.D.
San Francisco, CA · No drug or device payments recorded (2025) · Telehealth · (415) 502-7222
Dr. Meiwen Wu, MD
San Francisco, CA · $37 in drug and device payments (2025) · (209) 342-2300
Dr. Michael Corradetti, M.D.
San Francisco, CA · $57 in drug and device payments (2025) · Telehealth · (415) 600-3600
Dr. Monte Fisher, MD
San Francisco, CA · No drug or device payments recorded (2025) · (415) 637-7487
Dr. Moshiur Anwar, M.D., PH.D.
San Francisco, CA · No drug or device payments recorded (2025) · Telehealth · (415) 353-7175
Dr. Muhammad Nauman Malik, MD
San Francisco, CA · No drug or device payments recorded (2025) · (415) 353-7175
Dr. Nam Woo Cho, MDPHD
San Francisco, CA · No drug or device payments recorded (2025) · Telehealth · (415) 353-7175
Dr. Nicholas Eustace, MD PHD
San Francisco, CA · $1,217 in drug and device payments (2025) · (415) 353-7175
Dr. Nicolas Prionas, MD, PHD
San Francisco, CA · No drug or device payments recorded (2025) · Telehealth · (415) 353-2497
Dr. Rachel Sabol, MD, PHD
San Francisco, CA · No drug or device payments recorded (2025) · (415) 353-7175
Dr. Roy Abendroth, MD
San Francisco, CA · $33 in drug and device payments (2025) · Telehealth · (209) 342-2300
Dr. Sara Huang, MD
San Francisco, CA · No drug or device payments recorded (2025) · (209) 342-2300
Dr. Shervin Shirvani, MD
San Francisco, CA · No drug or device payments recorded (2025) · (415) 600-3634
Dr. Siyuan Liu, MD, PHD
San Francisco, CA · No drug or device payments recorded (2025) · Telehealth · (415) 353-7175
Dr. Steve Braunstein, MD, PHD
San Francisco, CA · $9,124 in drug and device payments (2025) · Telehealth · (415) 353-7175
Dr. Steven Seyedin, M.D.
San Francisco, CA · $472 in drug and device payments (2025) · Telehealth · (415) 353-7175
Dr. Sue Yom, M.D., PH.D.
San Francisco, CA · No drug or device payments recorded (2025) · Telehealth · (415) 353-7175
Dr. Victor Chen, MD, MPH
San Francisco, CA · $149 in drug and device payments (2025) · Telehealth · (415) 353-7175
Dr. William Chen, MD
San Francisco, CA · No drug or device payments recorded (2025) · Telehealth · (415) 833-2000
Dr. William Chen, MD
San Francisco, CA · No drug or device payments recorded (2025) · Telehealth · (415) 353-7175
Dr. William Wara, M.D.
San Francisco, CA · No drug or device payments recorded (2025) · (415) 353-7183
Dr. Catherine Su, MD
San Jose, CA · $63 in drug and device payments (2025) · (408) 977-4673
Dr. Constance Bowie, MD
San Jose, CA · No drug or device payments recorded (2025) · (408) 947-2995
Dr. Elizabeth Dubose, M.D.
San Jose, CA · No drug or device payments recorded (2025) · (408) 984-7226
Dr. Gail Bellman, M.D.
San Jose, CA · No drug or device payments recorded (2025) · (408) 947-2500
Dr. Gregory Colburn, MD
San Jose, CA · No drug or device payments recorded (2025) · (408) 947-2995

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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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. Are you a Radiation Oncology in California? Get featured.