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. Ted Ling, M.D., M.S.Palm Desert, CA · $297 in drug and device payments (2025) ·
(760) 200-8777 Dr. Theodore Masek, MDPalm Desert, CA · $78 in drug and device payments (2025) ·
(760) 200-8777 Dr. Amir Lavaf, M.D.Palm Springs, CA · $14,010 in drug and device payments (2025) ·
(760) 416-4770 Dr. Judy Jackson, M.D.Palm Springs, CA · $454 in drug and device payments (2025) ·
(760) 416-4770 Dr. Alexander Chin, MDPalo Alto, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 498-6339 Dr. Allison Zhong, MDPalo Alto, CA · $23 in drug and device payments (2025) ·
(650) 723-6171 Dr. Ann Minn, M.D.Palo Alto, CA · No drug or device payments recorded (2025) ·
(650) 723-6171 Dr. Daniel Schiffner, M.D.Palo Alto, CA · $763 in drug and device payments (2025) · Telehealth ·
(650) 321-4121 Dr. David Shultz, M.D.Palo Alto, CA · No drug or device payments recorded (2025) ·
(216) 513-3738 Dr. Erqi PollomPalo Alto, CA · $6,758 in drug and device payments (2025) · Telehealth ·
(650) 498-6339 Dr. Hailey Choi, M.D.Palo Alto, CA · No drug or device payments recorded (2025) ·
(650) 723-8463 Dr. Iris Gibbs, MDPalo Alto, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 723-6171 Dr. Michael Gensheimer, M.D.Palo Alto, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 723-6171 Dr. Nicholas Verdini, MDPalo Alto, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Robert Lundahl, MDPalo Alto, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 321-4121 Dr. Stanley Chism, M.DPalo Alto, CA · No drug or device payments recorded (2025) ·
(650) 322-6332 Dr. Susan Knox, M.D.,PH.D.Palo Alto, CA · No drug or device payments recorded (2025) ·
(650) 723-6171 Dr. Yuan Rao, MDPalo Alto, CA · $339 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Ramona Kyaw, M.D.Pasadena, CA · No drug or device payments recorded (2025) ·
(626) 397-5149 Dr. Ruth Williamson, MDPasadena, CA · No drug or device payments recorded (2025) ·
(626) 397-5149 Dr. Christine Chung, M.D.Pleasant Hill, CA · $222 in drug and device payments (2025) · Telehealth ·
(925) 825-8878 Dr. Loan Tran, MDPleasant Hill, CA · $594 in drug and device payments (2025) · Telehealth ·
(925) 435-1105 Dr. Sophia Rahman, M.D.Pleasant Hill, CA · No drug or device payments recorded (2025) · Telehealth ·
(925) 825-8878 Dr. Sravana Chennupati, MDPleasant Hill, CA · No drug or device payments recorded (2025) · Telehealth ·
(925) 825-8878 Dr. Yallapragada Rao, M.D.Pomona, CA · No drug or device payments recorded (2025) ·
(714) 865-9890 Dr. Bihai Peng, MDRancho Cordova, CA · No drug or device payments recorded (2025) ·
(916) 631-3000 Dr. Darryl Hunter, MDRancho Cordova, CA · No drug or device payments recorded (2025) ·
(916) 631-3000 Dr. Derrick Schmidt, MDRancho Cordova, CA · No drug or device payments recorded (2025) ·
(916) 631-3000 Dr. Nathalie Nguyen, MDRancho Cordova, CA · No drug or device payments recorded (2025) ·
(916) 631-2730 Dr. Rachel Chou, MDRancho Cordova, CA · No drug or device payments recorded (2025) ·
(916) 631-3000 Dr. Carolyn Barnes, M.D.Rancho Mirage, CA · $177 in drug and device payments (2025) ·
(760) 202-3946 Dr. Jeffrey Burkeen, M.D.Rancho Mirage, CA · No drug or device payments recorded (2025) · Telehealth ·
(760) 674-3600 Dr. John Einck, MDRancho Mirage, CA · $371 in drug and device payments (2025) · Telehealth ·
(760) 674-3600 Dr. John Stevenson, M.D.Rancho Mirage, CA · No drug or device payments recorded (2025) ·
(760) 674-3600 Dr. Kamal Patel, M.D.Rancho Mirage, CA · No drug or device payments recorded (2025) ·
(760) 674-3600 Dr. Monica Khanna, M.D.Rancho Mirage, CA · No drug or device payments recorded (2025) ·
(760) 674-3600 Dr. Mahesh Pant, M.D.Redding, CA · No drug or device payments recorded (2025) ·
(530) 245-5900 Dr. Nii-kwanchie Ankrah, M.D.Redding, CA · $22 in drug and device payments (2025) · Telehealth ·
(530) 245-5900 Dr. Sharon Pereira-matsumoto, MDRedding, CA · No drug or device payments recorded (2025) ·
(530) 224-2223 Dr. Vidya Bobba, M.D.Redding, CA · No drug or device payments recorded (2025) ·
(530) 245-5900 Dr. Wayne Koll, M.D.Redding, CA · $159 in drug and device payments (2025) ·
(530) 245-5900 Dr. James NelsonRedlands, CA · $80 in drug and device payments (2025) ·
(909) 335-5611 Dr. Daniel Hovenstine, MDRedondo Beach, CA · $113 in drug and device payments (2025) ·
(310) 517-4785 Dr. Thyra Endicott, MDRedondo Beach, CA · $239 in drug and device payments (2025) · Telehealth ·
(310) 517-4785 Dr. C Jane Marmor, MDRedwood City, CA · No drug or device payments recorded (2025) ·
(650) 245-3889 Dr. Clarence Young, MDRedwood City, CA · No drug or device payments recorded (2025) ·
(209) 342-2300 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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