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.
Where Radiation Oncologists in California practice
From CMS Medicare enrollment records covering 516 of the 734 providers listed here (70%). Providers who do not bill Medicare are not included in these figures.
16%solo or small practice (under 10 clinicians)
17%mid-size group (10 to 99)
67%large group or health system (100+)
Largest practice groups
| Group (as registered with Medicare) | Radiation Oncologists | All clinicians in group | Main city |
| City of Hope Medical Foundation | 54 | 964 | South Pasadena |
| Stanford Health Care | 31 | 3,152 | Stanford |
| University of California San Francisco | 30 | 1,780 | San Francisco |
| Permanente Medical Group Inc. | 29 | 10,928 | Santa Clara |
| Regents of the University of California | 27 | 2,047 | La Jolla |
Hospitals where they hold privileges
| Hospital | City | Ownership | CMS star rating | Radiation Oncologists affiliated |
| UCSF Medical Center | San Francisco | Nonprofit | 4 of 5 | 37 |
| Stanford Health Care | Stanford | Nonprofit | 5 of 5 | 35 |
| UC San Diego Health Hillcrest - Hillcrest Med Ctr | San Diego | Nonprofit | 5 of 5 | 32 |
| Uci Health-Orange | Orange | Government | 4 of 5 | 25 |
| Ronald Reagan UCLA Medical Center | Los Angeles | Government | 4 of 5 | 24 |
Sources: CMS Doctors and Clinicians (August 2026) and Facility Affiliation files (August 2026); hospital ownership type and overall star rating from CMS Hospital General Information (July 2026). A clinician in several groups is counted once, in the largest group they bill through. Ownership type is what the hospital reports to CMS; it does not show private equity or other investor ownership. How we build this directory.
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. Joseph Beck, M.D.Antioch, CA · No drug or device payments recorded (2025) ·
(925) 778-0679 Dr. Mariam Korah, MDAntioch, CA · $2,314 in drug and device payments (2025) · Telehealth ·
(925) 778-0679 Dr. Zahora Ally, MDAntioch, CA · $1,684 in drug and device payments (2025) · Telehealth ·
(925) 778-0679 Dr. Jesus Juarez CasillasApple Valley, CA · No drug or device payments recorded (2025) ·
(760) 503-5910 Dr. Rizwan Nurani, MDApple Valley, CA · $46,782 in drug and device payments (2025) · Telehealth ·
(760) 503-5910 Dr. Shahid Latif, MDApple Valley, CA · $172 in drug and device payments (2025) ·
(760) 242-9999 Dr. Andrew Tam, MDArcadia, CA · $218 in drug and device payments (2025) · Telehealth ·
(626) 574-3657 Dr. Hye Ri Han, MDArcadia, CA · No drug or device payments recorded (2025) · Telehealth ·
(626) 574-2860 Dr. James Chuang, MDArcadia, CA · No drug or device payments recorded (2025) ·
(626) 574-3657 Dr. Vikram Jairam, M.D.Auburn, CA · $145 in drug and device payments (2025) · Telehealth ·
(530) 402-2700 Dr. Ajay Desai, M.D.Bakersfield, CA · $480 in drug and device payments (2025) · Telehealth ·
(661) 322-2206 Dr. Behnood KhodayariBakersfield, CA · $28 in drug and device payments (2025) ·
(661) 491-5060 Dr. Dean Davis, M.D.Bakersfield, CA · $51 in drug and device payments (2025) ·
(661) 632-5700 Dr. Luis Mariscal, M.D.Bakersfield, CA · $263 in drug and device payments (2025) ·
(661) 323-4673 Dr. Marcher Thompson, M.D.Bakersfield, CA · $226 in drug and device payments (2025) ·
(661) 637-8100 Dr. James Rembert, MDBerkeley, CA · No drug or device payments recorded (2025) · Telehealth ·
(510) 204-5311 Dr. Patrick Swift, M.D.Berkeley, CA · No drug or device payments recorded (2025) ·
(510) 204-2462 Dr. Arash Gabayan, M.D.Beverly Hills, CA · $2,723 in drug and device payments (2025) ·
(310) 432-8989 Dr. Patricia Gordon, MDBeverly Hills, CA · No drug or device payments recorded (2025) ·
(310) 432-8900 Dr. Christopher Rose, M.D.Burbank, CA · No drug or device payments recorded (2025) ·
(818) 847-3440 Dr. Daniel BernadBurbank, CA · No drug or device payments recorded (2025) ·
(323) 620-6687 Dr. Karen Sokolov, M.D.Burbank, CA · $178 in drug and device payments (2025) ·
(818) 847-3444 Dr. Leslie St. Royal, M.D.Burbank, CA · No drug or device payments recorded (2025) ·
(818) 606-7540 Dr. Paul Menzel, M.D.Burbank, CA · $310 in drug and device payments (2025) ·
(818) 847-3444 Dr. Franklin Banker, M.D.Cameron Park, CA · No drug or device payments recorded (2025) ·
(530) 672-1351 Dr. Meghan MacomberCameron Park, CA · $56 in drug and device payments (2025) · Telehealth ·
(530) 672-3500 Dr. Matthew Wheatley, M.D.Carmichael, CA · $236 in drug and device payments (2025) · Telehealth ·
(916) 863-8700 Dr. Roger Gilbert, M.D.Carmichael, CA · No drug or device payments recorded (2025) ·
(916) 537-5470 Dr. Abhishek Kumar, MDCerritos, CA · $18 in drug and device payments (2025) ·
(562) 735-3226 Dr. Anne Dawson, M.D.Chico, CA · No drug or device payments recorded (2025) ·
(530) 332-3917 Dr. Harry Lomas, M.D.Chico, CA · No drug or device payments recorded (2025) ·
(530) 691-5922 Dr. Leith Hathout, MDChico, CA · No drug or device payments recorded (2025) ·
(530) 332-4700 Dr. Andrew Bruggeman, M.D.Chula Vista, CA · $129 in drug and device payments (2025) ·
(619) 502-5851 Dr. Douglas Rahn, M.D.Chula Vista, CA · $667 in drug and device payments (2025) · Telehealth ·
(619) 502-7730 Dr. Evan White, M.D.Chula Vista, CA · $554 in drug and device payments (2025) · Telehealth ·
(619) 502-7730 Dr. Gina Mansy, M.D.Chula Vista, CA · $208 in drug and device payments (2025) ·
(619) 502-7730 Dr. Phillip Zentner, MDChula Vista, CA · $45 in drug and device payments (2025) ·
(619) 482-5851 Dr. Ruben Carmona, MDChula Vista, CA · $370 in drug and device payments (2025) ·
(619) 502-5851 Dr. William Silveira, MDClovis, CA · No drug or device payments recorded (2025) · Telehealth ·
(559) 387-1600 Dr. Marjaneh Moini, MDConcord, CA · No drug or device payments recorded (2025) ·
(209) 342-2300 Dr. Michael Levine, MDConcord, CA · No drug or device payments recorded (2025) ·
(209) 342-2300 Dr. Rajni Sethi, MDConcord, CA · No drug or device payments recorded (2025) ·
(925) 674-2521 Dr. Richard Carmel, MDConcord, CA · No drug or device payments recorded (2025) ·
(209) 342-2300 Dr. Neung Kim, M.D.Corona, CA · No drug or device payments recorded (2025) ·
(951) 973-7380 Dr. Paul Mandelin, D.O.Corona, CA · No drug or device payments recorded (2025) ·
(951) 898-2826 Dr. Eulanca Liu, MD, PHDCovina, CA · No drug or device payments recorded (2025) ·
(626) 331-6866 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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