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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. Kaveh Maghsoudi
Salinas, CA · No drug or device payments recorded (2025) · Telehealth · (831) 758-2724
Dr. Kenneth Biehl, M.D.
Salinas, CA · No drug or device payments recorded (2025) · (831) 758-2724
Dr. Maira Simental, MD
San Bernardino, CA · No drug or device payments recorded (2025) · (909) 475-2700
Dr. Munther Alqaisi, M.D.
San Bernardino, CA · $20 in drug and device payments (2025) · (909) 887-8800
Dr. Wei-hsien Hou, M.D., PH.D.
San Bernardino, CA · No drug or device payments recorded (2025) · (909) 475-2700
Dr. Young Kwon, M.D.
San Bernardino, CA · No drug or device payments recorded (2025) · (909) 882-2266
Dr. Adam Horn, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (800) 926-8273
Dr. Andrew Chang, M.D.
San Diego, CA · $197 in drug and device payments (2025) · (858) 549-7400
Dr. Andrew Sharabi, M.D., PH.D.
San Diego, CA · $78 in drug and device payments (2025) · Telehealth · (619) 543-1899
Dr. Anna Dornisch, MD
San Diego, CA · $32 in drug and device payments (2025) · (800) 926-8273
Dr. Anuradha Koka, M.D.
San Diego, CA · $2,785 in drug and device payments (2025) · Telehealth · (619) 452-7350
Dr. Arno Mundt, M.D.
San Diego, CA · No drug or device payments recorded (2025) · Telehealth · (800) 926-8273
Dr. Asona Lui, MD, PHD
San Diego, CA · No drug or device payments recorded (2025) · (800) 926-8273
Dr. Atmaram Pai Panandiker, MD
San Diego, CA · $952 in drug and device payments (2025) · (503) 989-3483
Dr. Austin Hopper, MD
San Diego, CA · No drug or device payments recorded (2025) · Telehealth · (800) 926-8273
Dr. Bradley Prestidge, MD
San Diego, CA · $68 in drug and device payments (2025) · (619) 502-9084
Dr. Brian Chou, MD
San Diego, CA · $83 in drug and device payments (2025) · Telehealth · (858) 299-5982
Dr. Carl Rossi, M.D.
San Diego, CA · No drug or device payments recorded (2025) · Telehealth · (858) 549-7522
Dr. Chika Nwachukwu, MD
San Diego, CA · $43 in drug and device payments (2025) · Telehealth · (800) 926-8273
Dr. Christopher Straka, M.D.
San Diego, CA · $256 in drug and device payments (2025) · Telehealth · (800) 926-8273
Dr. Croix Fossum, M.D.
San Diego, CA · $729 in drug and device payments (2025) · (858) 939-5010
Dr. David Hoopes, M.D.
San Diego, CA · $380 in drug and device payments (2025) · Telehealth · (937) 367-3966
Dr. Donald Fuller, M.D.
San Diego, CA · $311 in drug and device payments (2025) · Telehealth · (619) 230-0400
Dr. Geoffrey Weinstein, MD
San Diego, CA · $56 in drug and device payments (2025) · (858) 939-5010
Dr. Henry Chessin, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (619) 230-0400
Dr. Iain Macewan, M.D.
San Diego, CA · No drug or device payments recorded (2025) · Telehealth · (858) 822-4048
Dr. Jehee Choi, MD
San Diego, CA · $31 in drug and device payments (2025) · Telehealth · (858) 549-7411
Dr. Jyoti Mayadev, M.D
San Diego, CA · $26,199 in drug and device payments (2025) · Telehealth · (800) 926-8273
Dr. Karen Tye, MD
San Diego, CA · $297 in drug and device payments (2025) · (800) 926-8273
Dr. Kathryn Tringale, MD
San Diego, CA · No drug or device payments recorded (2025) · Telehealth · (800) 926-8273
Dr. Kenneth Shimizu, M.D.
San Diego, CA · No drug or device payments recorded (2025) · Telehealth · (858) 554-4100
Dr. Kripa Guram, MD
San Diego, CA · No drug or device payments recorded (2025) · (800) 926-8273
Dr. Lori Coleman, MD
San Diego, CA · $20 in drug and device payments (2025) · (858) 939-5010
Dr. Megan Orr, MD
San Diego, CA · No drug or device payments recorded (2025) · (800) 926-8273
Dr. Michael Sherer, MD
San Diego, CA · No drug or device payments recorded (2025) · Telehealth · (800) 926-8273
Dr. Parag Sanghvi, M.D., M..S.P.H.
San Diego, CA · $7,500 in drug and device payments (2025) · Telehealth · (800) 926-8273
Dr. Prabhakar Tripuraneni, M.D.
San Diego, CA · $349 in drug and device payments (2025) · Telehealth · (858) 554-4100
Dr. Reza Shirazi, M.D.
San Diego, CA · $1,260 in drug and device payments (2025) · Telehealth · (619) 230-0400
Dr. Robert Beckmann, MD
San Diego, CA · No drug or device payments recorded (2025) · (619) 532-6400
Dr. Robert Takesuye, D.O.
San Diego, CA · $56 in drug and device payments (2025) · Telehealth · (619) 532-7274
Dr. Ronald Davis, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (619) 230-0400
Dr. Sangwoo Kim, MD
San Diego, CA · No drug or device payments recorded (2025) · Telehealth · (800) 926-8273
Dr. Sara Rosenthal, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (619) 230-0400
Dr. Shane Mesko, M.D., MBA
San Diego, CA · $3,646 in drug and device payments (2025) · Telehealth · (619) 452-7350
Dr. Siavash Jabbari, MD
San Diego, CA · $329 in drug and device payments (2025) · (858) 939-5010
Dr. Siavosh Vakilian, MD
San Diego, CA · $560 in drug and device payments (2025) · Telehealth · (619) 230-0400
Dr. Tahir Ijaz, M.D.
San Diego, CA · $670 in drug and device payments (2025) · Telehealth · (619) 230-0400
Dr. Tyler Seibert, M.D., PH.D.
San Diego, CA · $4,334 in drug and device payments (2025) · Telehealth · (858) 822-6040
Dr. Yonina Tova, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (619) 230-0400
Dr. Alexander Geng, M.D.
San Francisco, CA · No drug or device payments recorded (2025) · Telehealth · (415) 353-6420

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.

Related reading on HealthcareDiscovery.AI

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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.