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. Ji Kim, M.D.Lancaster, CA · $16 in drug and device payments (2025) · Telehealth ·
(661) 902-5600 Dr. Trevor Lim, M.D.Lancaster, CA · No drug or device payments recorded (2025) · Telehealth ·
(661) 902-5600 Dr. Chad Sila, M.D.Lawndale, CA · $80 in drug and device payments (2025) · Telehealth ·
(310) 978-4970 Dr. Clifford Merlo, MDLawndale, CA · No drug or device payments recorded (2025) ·
(310) 978-4970 Dr. Jennie Cho-lim, M.D.Lawndale, CA · No drug or device payments recorded (2025) ·
(310) 978-4970 Dr. Lesley Lawrenson, M.D., PH.D.Lawndale, CA · No drug or device payments recorded (2025) ·
(424) 452-6068 Dr. Travers Mcloughlin, MDLodi, CA · No drug or device payments recorded (2025) · Telehealth ·
(209) 365-1761 Dr. Ben Jabola, M.D.Loma Linda, CA · No drug or device payments recorded (2025) ·
(909) 558-8311 Dr. David Bush, M.D.Loma Linda, CA · No drug or device payments recorded (2025) · Telehealth ·
(909) 558-8311 Dr. Gary Yang, MDLoma Linda, CA · $5,005 in drug and device payments (2025) ·
(909) 558-4244 Dr. Ivan Namihas, M.D.Loma Linda, CA · $144 in drug and device payments (2025) · Telehealth ·
(909) 558-8311 Dr. Jerry Slater, M.D.Loma Linda, CA · No drug or device payments recorded (2025) ·
(909) 558-8311 Dr. Jessica Jutzy, MDLoma Linda, CA · No drug or device payments recorded (2025) ·
(909) 558-4244 Dr. Joseph Kang, M.D., PH.D.Loma Linda, CA · $287 in drug and device payments (2025) · Telehealth ·
(909) 552-8056 Dr. Lilia Loredo, M.D.Loma Linda, CA · $25 in drug and device payments (2025) · Telehealth ·
(909) 558-8311 Dr. Oscar Padilla, MDLoma Linda, CA · No drug or device payments recorded (2025) · Telehealth ·
(909) 558-4258 Dr. Peter Zaki, MDLoma Linda, CA · $45 in drug and device payments (2025) · Telehealth ·
(909) 558-4243 Dr. Stephanie Kwan, MD, MTMLoma Linda, CA · $142 in drug and device payments (2025) ·
(909) 558-8056 Dr. John Wilkinson, M.D.Lompoc, CA · $20 in drug and device payments (2025) · Telehealth ·
(057) 368-6288 Dr. Alam Syed, M.D.Long Beach, CA · $156 in drug and device payments (2025) ·
(562) 933-0300 Dr. Brace Hintz, M.D.Long Beach, CA · $62 in drug and device payments (2025) ·
(562) 826-5605 Dr. Christine YangLong Beach, CA · No drug or device payments recorded (2025) ·
(562) 933-0300 Dr. Jessica Xing, MDLong Beach, CA · $18 in drug and device payments (2025) ·
(818) 518-0331 Dr. Randy Wei, M.D., PH.D.Long Beach, CA · $3,183 in drug and device payments (2025) ·
(714) 962-7100 Dr. Samar Azawi, M.D.Long Beach, CA · No drug or device payments recorded (2025) ·
(562) 826-8000 Dr. Sayana Shah, M.D.Long Beach, CA · $99 in drug and device payments (2025) ·
(562) 491-9890 Dr. Sulabha Dave, MDLong Beach, CA · $22 in drug and device payments (2025) ·
(562) 633-0836 Dr. Thomas Gates, MDLong Beach, CA · No drug or device payments recorded (2025) ·
(951) 691-5123 Dr. Liam Ghiam, MD, MSLos Alamitos, CA · $121 in drug and device payments (2025) ·
(562) 799-3198 Dr. Adam Garsa, M.D.Los Angeles, CA · $1,249 in drug and device payments (2025) · Telehealth ·
(323) 865-3050 Dr. Afshin Safa, MDLos Angeles, CA · No drug or device payments recorded (2025) · Telehealth ·
(310) 825-9771 Dr. Ahmad Sadeghi, M.D.Los Angeles, CA · No drug or device payments recorded (2025) ·
(310) 478-3711 Dr. Aimee Quan, MDLos Angeles, CA · $231 in drug and device payments (2025) ·
(323) 783-4011 Dr. Alan Lee, M.D.Los Angeles, CA · $1,126 in drug and device payments (2025) · Telehealth ·
(310) 825-0128 Dr. Albert Chang, MD PHDLos Angeles, CA · $67,538 in drug and device payments (2025) · Telehealth ·
(310) 825-0128 Dr. Amar Kishan, M.D.Los Angeles, CA · $16,524 in drug and device payments (2025) · Telehealth ·
(310) 825-9771 Dr. Andrew Lim, MD, BSCLos Angeles, CA · $325 in drug and device payments (2025) · Telehealth ·
(323) 865-3050 Dr. Ann Raldow, M.D.Los Angeles, CA · No drug or device payments recorded (2025) · Telehealth ·
(310) 825-9771 Dr. Aram Modrek, MD, PHDLos Angeles, CA · $24 in drug and device payments (2025) · Telehealth ·
(323) 865-3050 Dr. Aroor Rao, MDLos Angeles, CA · No drug or device payments recorded (2025) ·
(323) 783-4011 Dr. Atefeh Rezaei, MDLos Angeles, CA · No drug or device payments recorded (2025) ·
(310) 825-9775 Dr. Barry Goy, MDLos Angeles, CA · No drug or device payments recorded (2025) ·
(323) 783-4011 Dr. Bernard Lewinsky, MDLos Angeles, CA · No drug or device payments recorded (2025) ·
(213) 744-1460 Dr. Brittney Chau, MDLos Angeles, CA · $209 in drug and device payments (2025) ·
(323) 409-5010 Dr. Christopher King, M.D.Los Angeles, CA · No drug or device payments recorded (2025) ·
(310) 825-0128 Dr. Daniel Kim, M.D.Los Angeles, CA · No drug or device payments recorded (2025) ·
(323) 865-3050 Dr. Darlene Bugoci, M.D.Los Angeles, CA · $246 in drug and device payments (2025) · Telehealth ·
(323) 783-3719 Dr. David Demanes, M.D.Los Angeles, CA · No drug or device payments recorded (2025) ·
(310) 825-0128 Dr. David Hong, M.D.Los Angeles, CA · $62 in drug and device payments (2025) · Telehealth ·
(323) 865-3050 Dr. David Huang, MDLos Angeles, CA · $349 in drug and device payments (2025) · Telehealth ·
(213) 977-2360 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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