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. Richard Jennelle, M.D.Los Angeles, CA · No drug or device payments recorded (2025) ·
(323) 865-3050 Dr. Ricky Savjani, MD/PHDLos Angeles, CA · $4,848 in drug and device payments (2025) · Telehealth ·
(310) 825-9775 Dr. Robert Chin, MD, PHDLos Angeles, CA · No drug or device payments recorded (2025) · Telehealth ·
(310) 301-9775 Dr. Robert Zimmerman, MDLos Angeles, CA · No drug or device payments recorded (2025) ·
(213) 724-5634 Dr. Robyn Banerjee, MDLos Angeles, CA · No drug or device payments recorded (2025) ·
(310) 206-2510 Dr. Ronald Lau, MDLos Angeles, CA · $33 in drug and device payments (2025) ·
(323) 865-3050 Dr. Rosa Ong, MDLos Angeles, CA · $29 in drug and device payments (2025) ·
(323) 783-4011 Dr. Roy Vongtama, M.D.Los Angeles, CA · No drug or device payments recorded (2025) · Telehealth ·
(310) 825-0128 Dr. Sai DurisetiLos Angeles, CA · No drug or device payments recorded (2025) ·
(310) 478-3711 Dr. Samuel Shin, MDLos Angeles, CA · $36 in drug and device payments (2025) ·
(323) 783-4011 Dr. Sara Kim, M.D.Los Angeles, CA · $57 in drug and device payments (2025) · Telehealth ·
(310) 825-9775 Dr. Shahrokh Iganej, MDLos Angeles, CA · No drug or device payments recorded (2025) ·
(323) 783-4011 Dr. Sharon Lu, M.D.Los Angeles, CA · $28 in drug and device payments (2025) ·
(714) 644-6030 Dr. Shelly Bian, MDLos Angeles, CA · No drug or device payments recorded (2025) ·
(323) 865-3050 Dr. Simon Ro, MDLos Angeles, CA · No drug or device payments recorded (2025) ·
(323) 783-4011 Dr. Stella Yoo, M.D.Los Angeles, CA · No drug or device payments recorded (2025) ·
(323) 865-3050 Dr. Steve Lee, MDLos Angeles, CA · $138 in drug and device payments (2025) ·
(310) 825-9775 Dr. Steven LauLos Angeles, CA · No drug or device payments recorded (2025) · Telehealth ·
(310) 825-9776 Dr. Sun Gim, MDLos Angeles, CA · No drug or device payments recorded (2025) ·
(323) 783-4011 Dr. Susan Mccloskey, M.D.Los Angeles, CA · No drug or device payments recorded (2025) · Telehealth ·
(310) 825-0128 Dr. Tania Kaprealian, MDLos Angeles, CA · No drug or device payments recorded (2025) · Telehealth ·
(310) 825-0128 Dr. Teri Katz, MDLos Angeles, CA · No drug or device payments recorded (2025) ·
(323) 783-4011 Dr. Trudy Wu, MDLos Angeles, CA · No drug or device payments recorded (2025) · Telehealth ·
(310) 825-9775 Dr. Vishruth Reddy, M.D., PH.D.Los Angeles, CA · No drug or device payments recorded (2025) · Telehealth ·
(310) 267-9099 Dr. William Lorentz, M.D.Los Angeles, CA · No drug or device payments recorded (2025) ·
(310) 268-3390 Dr. Winston Lien, MDLos Angeles, CA · $843 in drug and device payments (2025) ·
(323) 783-2841 Dr. Deepak Khuntia, MDLos Gatos, CA · No drug or device payments recorded (2025) ·
(408) 358-8400 Dr. Gordon Wong, M.D.Los Gatos, CA · $377 in drug and device payments (2025) · Telehealth ·
(408) 358-8400 Dr. Rakesh Patel, MDLos Gatos, CA · $270 in drug and device payments (2025) ·
(408) 358-8400 Dr. Tangel ChangLos Gatos, CA · $23 in drug and device payments (2025) ·
(408) 358-8400 Dr. Daljit Soni, M.DLynwood, CA · No drug or device payments recorded (2025) ·
(310) 900-2760 Dr. Miljenko Pilepich, M.D.Malibu, CA · No drug or device payments recorded (2025) ·
(310) 597-5147 Dr. Charles Wilkinson, M.D.Marysville, CA · $23 in drug and device payments (2025) ·
(530) 749-4400 Dr. Victor Jung, M.D.Marysville, CA · No drug or device payments recorded (2025) ·
(530) 749-4400 Dr. Sandra Birdwell, MDMenlo Park, CA · No drug or device payments recorded (2025) ·
(650) 743-8105 Dr. Alireza Mahmoudieh, MDMerced, CA · $2,879 in drug and device payments (2025) ·
(209) 726-3410 Dr. Nina Cote, MDMission Hills, CA · No drug or device payments recorded (2025) · Telehealth ·
(818) 496-4410 Dr. Carolyn Young, MDMission Viejo, CA · No drug or device payments recorded (2025) ·
(949) 573-9560 Dr. Elizabeth Hyden, MDMission Viejo, CA · No drug or device payments recorded (2025) ·
(949) 364-9120 Dr. Michael Lock, MDMission Viejo, CA · No drug or device payments recorded (2025) ·
(949) 364-9120 Dr. William Chou, MDMission Viejo, CA · $193 in drug and device payments (2025) ·
(949) 573-9560 Dr. Eric Ku, MDModesto, CA · $215 in drug and device payments (2025) · Telehealth ·
(209) 572-7237 Dr. Jorge Garcia-young, M.D.Modesto, CA · $1,149 in drug and device payments (2025) · Telehealth ·
(209) 572-7237 Dr. John Thropay, M.D.Montebello, CA · No drug or device payments recorded (2025) ·
(323) 724-8780 Dr. Bradley Tamler, M.D.Monterey, CA · $25 in drug and device payments (2025) ·
(831) 624-5311 Dr. David Holley, M.D.Monterey, CA · No drug or device payments recorded (2025) ·
(831) 624-5311 Dr. Neal Glover, M.D.Monterey, CA · No drug or device payments recorded (2025) ·
(831) 624-5311 Dr. Samrat Sanghvi, M.D.Monterey, CA · $2,972 in drug and device payments (2025) ·
(831) 242-8645 Dr. David Hsu, MDMonterey Park, CA · No drug or device payments recorded (2025) ·
(626) 571-6100 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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