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Oncologists in California

Data updated monthly · Last refresh October 2026

450 Medical Oncology providers practice in California, including 271 (60%) offering telehealth. The largest concentration is in Stanford. 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.

450providers
271telehealth
Stanfordtop city

Medical Oncology by city in California

Choose a city to see providers there.

Medical Oncology in Stanford83 providers
Medical Oncology in San Francisco54 providers
Medical Oncology in Duarte49 providers
Medical Oncology in Los Angeles39 providers
Medical Oncology in San Diego19 providers
Medical Oncology in Palo Alto18 providers
Medical Oncology in Sacramento11 providers
Medical Oncology in San Jose11 providers
Medical Oncology in La Jolla7 providers
Medical Oncology in Pleasanton7 providers
Medical Oncology in Irvine6 providers
Medical Oncology in Orange6 providers
Medical Oncology in Redding5 providers
Medical Oncology in South San Francisco5 providers
Medical Oncology in Fullerton4 providers
Medical Oncology in Cerritos4 providers
Medical Oncology in Loma Linda4 providers
Medical Oncology in Pasadena4 providers
Medical Oncology in Beverly Hills4 providers
Medical Oncology in Fresno3 providers
Medical Oncology in Campbell3 providers
Medical Oncology in Torrance3 providers
Medical Oncology in Castro Valley3 providers
Medical Oncology in West Hollywood3 providers

Medical 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. Lee Hong, MD, PHD
Irvine, CA · $606 in drug and device payments (2025) · Telehealth · (949) 671-4523
Dr. Pashtoon Kasi, MD, MS
Irvine, CA · $122 in drug and device payments (2025) · Telehealth · (800) 826-4673
Dr. Aren Ebrahimi, DO
La Jolla, CA · $134 in drug and device payments (2025) · (858) 554-3200
Dr. Darren Sigal, MD
La Jolla, CA · $5,152 in drug and device payments (2025) · Telehealth · (858) 554-5269
Dr. Edna Flores, M.D.
La Jolla, CA · $5,658 in drug and device payments (2025) · Telehealth · (858) 552-1410
Dr. Hitendra Patel, M.D.
La Jolla, CA · No drug or device payments recorded (2025) · Telehealth · (858) 822-3115
Dr. Kathryn Gold, MD
La Jolla, CA · $56 in drug and device payments (2025) · Telehealth · (858) 822-5182
Dr. Munveer Bhangoo, MD
La Jolla, CA · $83,274 in drug and device payments (2025) · Telehealth · (858) 554-3200
Dr. Pushpendu Banerjee, M.D.
La Jolla, CA · $4,908 in drug and device payments (2025) · Telehealth · (858) 552-1410
Dr. Rajendra Prasad, M.D.
Lakewood, CA · $23 in drug and device payments (2025) · (562) 272-7632
Dr. Eduardo Siccion, MD
La Verne, CA · No drug or device payments recorded (2025) · (860) 999-9999
Dr. Herbert Rappaport, MD
Lawndale, CA · No drug or device payments recorded (2025) · (310) 644-8400
Dr. Chien-shing Chen, M.D.
Loma Linda, CA · $5,387 in drug and device payments (2025) · Telehealth · (909) 558-2481
Dr. Gayathri Nagaraj, MD
Loma Linda, CA · $233 in drug and device payments (2025) · Telehealth · (909) 558-2262
Dr. Hamid Mirshahidi, M.D.
Loma Linda, CA · $3,142 in drug and device payments (2025) · Telehealth · (909) 558-2481
Dr. Zarah Dulce Lucas, MD
Loma Linda, CA · $19 in drug and device payments (2025) · (909) 825-7084
Dr. Karla Olmedo Gutierrez, MD
Long Beach, CA · No drug or device payments recorded (2025) · Telehealth · (562) 590-0345
Dr. Afsaneh Barzi, M.D.
Los Angeles, CA · $157 in drug and device payments (2025) · (323) 865-3105
Dr. Amir Goldkorn, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 865-3105
Dr. Anastasia Martynova, M.D.
Los Angeles, CA · $16,291 in drug and device payments (2025) · Telehealth · (323) 865-3900
Dr. Anishka D'souza, M.D.
Los Angeles, CA · $549 in drug and device payments (2025) · Telehealth · (323) 865-3000
Dr. Anthony El-khoueiry, M.D.
Los Angeles, CA · $28,225 in drug and device payments (2025) · Telehealth · (323) 865-3000
Dr. Barbara Gitlitz, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 865-3105
Dr. Barliz Waissengrin, MD
Los Angeles, CA · No drug or device payments recorded (2025) · (818) 233-2154
Dr. Bing Xia, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 865-3105
Dr. Christy Russell, M.D.
Los Angeles, CA · $132 in drug and device payments (2025) · (323) 865-3105
Dr. Coyin Oh
Los Angeles, CA · $23 in drug and device payments (2025) · (310) 423-8030
Dr. Daphne Stewart, M.D
Los Angeles, CA · $174 in drug and device payments (2025) · Telehealth · (323) 442-5100
Dr. Darcy Spicer, M.D.
Los Angeles, CA · $51 in drug and device payments (2025) · Telehealth · (323) 865-3105
Dr. David Agus, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · Telehealth · (310) 272-7640
Dr. David Freyer, DO
Los Angeles, CA · No drug or device payments recorded (2025) · (323) 865-3000
Dr. David Quinn, M.D.
Los Angeles, CA · $26 in drug and device payments (2025) · Telehealth · (323) 865-3956
Dr. David Stolinsky, M.D.
Los Angeles, CA · No drug or device payments recorded (2025) · (310) 659-5099
Dr. David Tran, MD PHD
Los Angeles, CA · $20,781 in drug and device payments (2025) · (323) 442-5720
Dr. Evanthia Roussos Torres, M.D.
Los Angeles, CA · $43 in drug and device payments (2025) · (323) 865-3105
Dr. Heinz-josef Lenz, M.D.
Los Angeles, CA · $81,732 in drug and device payments (2025) · Telehealth · (323) 865-3105
Dr. Jacek Pinski, M.D.
Los Angeles, CA · $74,810 in drug and device payments (2025) · Telehealth · (323) 865-3000
Dr. Jacob Thomas
Los Angeles, CA · $69 in drug and device payments (2025) · Telehealth · (323) 865-3105
Dr. James Hu, M.D.
Los Angeles, CA · $3,622 in drug and device payments (2025) · Telehealth · (310) 423-8530
Dr. Jin Sun Bitar, M.D.
Los Angeles, CA · $16 in drug and device payments (2025) · Telehealth · (310) 423-8530
Dr. Kamya Sankar
Los Angeles, CA · $2,528 in drug and device payments (2025) · Telehealth · (310) 423-8530
Dr. Lawrence Liu, MD
Los Angeles, CA · $895 in drug and device payments (2025) · Telehealth · (310) 423-1160
Dr. Mark Agulnik, MD
Los Angeles, CA · $29,811 in drug and device payments (2025) · Telehealth · (323) 865-3000
Dr. Maryliza El-masry, M.D.
Los Angeles, CA · $212 in drug and device payments (2025) · Telehealth · (323) 226-7556
Dr. Michael Castro, M.D.
Los Angeles, CA · $2,913 in drug and device payments (2025) · Telehealth · (808) 445-4085
Dr. Miguel Quirch, MD
Los Angeles, CA · $12,614 in drug and device payments (2025) · Telehealth · (213) 481-3948
Dr. Mitchell Gross, M.D.
Los Angeles, CA · $131 in drug and device payments (2025) · Telehealth · (310) 272-7640
Dr. Patricia Young, MD
Los Angeles, CA · $25 in drug and device payments (2025) · Telehealth · (310) 423-5585
Dr. Priya Jayachandran, MD
Los Angeles, CA · No drug or device payments recorded (2025) · Telehealth · (323) 865-3950
Dr. Robert Gale
Los Angeles, CA · $1,300 in drug and device payments (2025) · (310) 442-9010

Common questions

How many Medical Oncology providers are in California?

There are 450 Medical Oncology providers with active NPI records practicing in California, according to federal NPPES data refreshed monthly.

Do Medical Oncology providers in California offer telehealth?

Yes. 271 of the 450 Medical Oncology providers in California (about 60%) report offering telehealth services in CMS data.

Which cities in California have the most Medical Oncology providers?

Stanford (83), San Francisco (54), Duarte (49) have the highest concentration of Medical Oncology providers in California.

How many Medical Oncology providers in California received drug or device company payments?

281 of 450 Medical Oncology providers in California (62%) 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 Oncologists in California work in independent practices or large health systems?

Among 313 Oncologists in California enrolled in Medicare, 7% bill through a solo or small practice with fewer than 10 clinicians, 4% through a mid-size group of 10 to 99, and 88% through a large group or health system with 100 or more clinicians, according to CMS enrollment records.

Which hospitals do Oncologists in California work at?

According to CMS facility affiliation records, the California hospitals where the most Oncologists hold privileges are Stanford Health Care in Stanford; UCSF Medical Center in San Francisco; Stanford Health Care Tri-Valley in Pleasanton.

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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 Medical Oncology in California? Get featured.