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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. Lisa Boohar, MD
Redwood City, CA · No drug or device payments recorded (2025) · (209) 342-2300
Dr. Afshin Rashtian, MD
Riverside, CA · $601 in drug and device payments (2025) · Telehealth · (951) 786-5501
Dr. Janet Hocko, M.D.
Riverside, CA · No drug or device payments recorded (2025) · (951) 683-6771
Dr. Karen Cheng, M.D.
Riverside, CA · No drug or device payments recorded (2025) · (951) 683-6771
Dr. Susanna Gordon, M.D.
Riverside, CA · No drug or device payments recorded (2025) · (951) 683-6771
Dr. Irwin Lee, MD
Rohnert Park, CA · No drug or device payments recorded (2025) · (707) 584-2200
Dr. Marc Fields, MD
Rohnert Park, CA · No drug or device payments recorded (2025) · (209) 543-0684
Dr. Nikhil Rao, MD
Rohnert Park, CA · No drug or device payments recorded (2025) · (877) 866-0914
Dr. Peter Hawkins, M.D., PH.D.
Rohnert Park, CA · No drug or device payments recorded (2025) · (707) 584-2200
Dr. Allan Chen, M.D.
Roseville, CA · No drug or device payments recorded (2025) · (916) 771-2871
Dr. Charlotte Kubicky, MD, PHD
Roseville, CA · $132 in drug and device payments (2025) · Telehealth · (916) 781-1225
Dr. Derrick Koo, MD
Roseville, CA · No drug or device payments recorded (2025) · (916) 771-2871
Dr. Nima Harandi, MD
Roseville, CA · No drug or device payments recorded (2025) · (916) 771-2871
Dr. Andrew Wong, MD
Sacramento, CA · $34 in drug and device payments (2025) · Telehealth · (916) 734-5810
Dr. Anthony Pu, MD
Sacramento, CA · $305 in drug and device payments (2025) · Telehealth · (877) 515-0053
Dr. Arta Monjazeb, M.D., PH.D.
Sacramento, CA · $150 in drug and device payments (2025) · Telehealth · (336) 575-2977
Dr. Bailey Loving, MD
Sacramento, CA · $217 in drug and device payments (2025) · Telehealth · (916) 556-3131
Dr. Brian Goldsmith, M.D.
Sacramento, CA · $39 in drug and device payments (2025) · (916) 453-9999
Dr. Carlin Hauck, M.D.
Sacramento, CA · $145 in drug and device payments (2025) · Telehealth · (916) 454-6600
Dr. Charles Wang, MD / PHD
Sacramento, CA · No drug or device payments recorded (2025) · (408) 858-3129
Dr. Christopher Fleming, MD
Sacramento, CA · $85 in drug and device payments (2025) · Telehealth · (916) 556-3131
Dr. David Linstadt, M.D.
Sacramento, CA · No drug or device payments recorded (2025) · (877) 515-0053
Dr. Ellen Wiegner, MD
Sacramento, CA · $126 in drug and device payments (2025) · Telehealth · (916) 536-3200
Dr. Ellis Andras, MD
Sacramento, CA · No drug or device payments recorded (2025) · (877) 515-0053
Dr. Garrick Chang, M.D.
Sacramento, CA · No drug or device payments recorded (2025) · (916) 646-8300
Dr. Harvey Wolkov, MD
Sacramento, CA · No drug or device payments recorded (2025) · (916) 454-6600
Dr. Hubert Pan, MD
Sacramento, CA · $168 in drug and device payments (2025) · Telehealth · (916) 454-6600
Dr. Janice Ryu, M.D.
Sacramento, CA · $200 in drug and device payments (2025) · (877) 515-0053
Dr. Jeffrey Suplica, M.D.
Sacramento, CA · No drug or device payments recorded (2025) · (877) 515-0053
Dr. Ky Nam Nguyen, M.D.
Sacramento, CA · $223 in drug and device payments (2025) · (408) 499-4595
Dr. Mark Leibenhaut, M.D.
Sacramento, CA · No drug or device payments recorded (2025) · (916) 454-6600
Dr. Mark Logsdon, M.D.
Sacramento, CA · $1,350 in drug and device payments (2025) · Telehealth · (916) 454-6600
Dr. Melissa Lemieux, M.D.
Sacramento, CA · $24 in drug and device payments (2025) · Telehealth · (916) 556-3200
Dr. Minahal Naveed
Sacramento, CA · $394 in drug and device payments (2025) · (916) 734-8688
Dr. Paul Page, MD
Sacramento, CA · $1,698 in drug and device payments (2025) · (916) 683-9616
Dr. Richard Valicenti, M.D.
Sacramento, CA · $2,343 in drug and device payments (2025) · Telehealth · (916) 734-8295
Dr. Ruben Fragoso, MD, PHD
Sacramento, CA · $28 in drug and device payments (2025) · Telehealth · (916) 734-8276
Dr. Seth Rosenthal, M.D.
Sacramento, CA · $306 in drug and device payments (2025) · (877) 515-0053
Dr. Shyam Rao, M.D., PH.D.
Sacramento, CA · No drug or device payments recorded (2025) · Telehealth · (916) 734-8051
Dr. Susan Lee, MD
Sacramento, CA · No drug or device payments recorded (2025) · (916) 453-4528
Dr. Tony Quang, M.D.
Sacramento, CA · $315 in drug and device payments (2025) · (916) 734-7888
Dr. Vincent Lee, M.D.
Sacramento, CA · $390 in drug and device payments (2025) · (877) 866-0914
Dr. Xiao Zhao, M.D.
Sacramento, CA · No drug or device payments recorded (2025) · Telehealth · (916) 734-5823
Dr. Yufan Wu, MD
Sacramento, CA · No drug or device payments recorded (2025) · Telehealth · (916) 556-3131
Dr. Zelanna Goldberg, M.D.
Sacramento, CA · No drug or device payments recorded (2025) · (916) 734-8252
Dr. David Tate, MD
Saint Helena, CA · $952 in drug and device payments (2025) · Telehealth · (707) 967-5721
Dr. Stephen Banks, MD
Saint Helena, CA · $470 in drug and device payments (2025) · Telehealth · (707) 967-5721
Dr. David Greene, M.D.
Salinas, CA · No drug or device payments recorded (2025) · Telehealth · (858) 603-0172
Dr. Esmond Chan, M.D.
Salinas, CA · No drug or device payments recorded (2025) · (831) 758-2724
Dr. Jacob Andrade, MD
Salinas, CA · No drug or device payments recorded (2025) · Telehealth · (831) 758-2724

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.