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 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. Michael Khodadoust, M.D./PH.D.Stanford, CA · $144 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Michael Spinner, M.D.Stanford, CA · $6,208 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Ming-gui Pan, MDStanford, CA · $125 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Min Lu, MDStanford, CA · $9,479 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Nam Bui, MDStanford, CA · $1,354 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Nathaniel Myall, MDStanford, CA · $26 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Neel Gupta, MDStanford, CA · $141 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Neha Patel, MDStanford, CA · $398 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Pamela Basto, MD, PHDStanford, CA · $26 in drug and device payments (2025) ·
(650) 723-4000 Dr. Pamela Munster, MDStanford, CA · $254 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Priyamvadha Chakravarthi, M.D.Stanford, CA · $33 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Rajat Rohatgi, M.D.Stanford, CA · No drug or device payments recorded (2025) ·
(650) 387-5666 Dr. Ranjana Advani, MDStanford, CA · $10,537 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Robert Hsieh, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 498-6000 Dr. Ronald Levy, MDStanford, CA · $20,058 in drug and device payments (2025) ·
(650) 723-4000 Dr. Saad Munib Ahmed Khan, MDStanford, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 723-4000 Dr. Sandhya Srinivas, MDStanford, CA · $14,497 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Shagufta Shaheen, M.DStanford, CA · $11,857 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Shruti Patel, MDStanford, CA · $2,793 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Stefano Testa, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Stina Singel, MD,PHDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Suleiman Massarweh, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Sumit Shah, MDStanford, CA · $575 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Sunil Reddy, M.D.Stanford, CA · $1,785 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Thomas Holden, MDStanford, CA · $20 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Timothy Ellis-caleo, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Tyler Johnson, M.D.Stanford, CA · $64 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Vivek Subbiah, MDStanford, CA · $48,973 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Masoom Kandahari, MD FACPTemecula, CA · $3,842 in drug and device payments (2025) · Telehealth ·
(951) 234-7006 Dr. Jeffrey WiezorekThousand Oaks, CA · No drug or device payments recorded (2025) ·
(805) 447-5707 Dr. Jeena Chorath, M.D.Torrance, CA · No drug or device payments recorded (2025) ·
(847) 271-9351 Dr. Parvin Peddi, MDTorrance, CA · $1,207 in drug and device payments (2025) · Telehealth ·
(310) 325-8252 Dr. Robert Margolis, M.D.Torrance, CA · No drug or device payments recorded (2025) ·
(310) 354-4221 Dr. Sareena Malhi, MDTravis Afb, CA · No drug or device payments recorded (2025) ·
(707) 423-5129 Dr. Laurence Heifetz, MDTruckee, CA · No drug or device payments recorded (2025) ·
(530) 582-6450 Dr. Hely Shah, M.D.Ukiah, CA · $1,236 in drug and device payments (2025) · Telehealth ·
(707) 463-7627 Dr. Jessica Powers, M.D.Vacaville, CA · $1,057 in drug and device payments (2025) · Telehealth ·
(707) 624-8000 Dr. Shihfan Yeh, M.D.Vallejo, CA · No drug or device payments recorded (2025) ·
(707) 651-1077 Dr. Robert Ouwendijk, M.D.Ventura, CA · No drug or device payments recorded (2025) ·
(805) 652-6556 Dr. Robert Havard, MDVisalia, CA · $1,087 in drug and device payments (2025) ·
(559) 624-3000 Dr. Anwer Shaikh, M.D.Vista, CA · $3,801 in drug and device payments (2025) · Telehealth ·
(760) 298-5787 Dr. Ethan Schram, M.D.Walnut Creek, CA · $2,382 in drug and device payments (2025) · Telehealth ·
(925) 433-8786 Dr. Juraj Kavecansky, MDWalnut Creek, CA · No drug or device payments recorded (2025) · Telehealth ·
(925) 295-4030 Dr. Arsen Osipov, M.D.West Hollywood, CA · $9,188 in drug and device payments (2025) · Telehealth ·
(310) 423-6066 Dr. Reva Basho, M.D.West Hollywood, CA · $22,342 in drug and device payments (2025) · Telehealth ·
(310) 967-2700 Dr. Ronald Natale, M.D.West Hollywood, CA · No drug or device payments recorded (2025) ·
(310) 423-1101 Dr. Michael Masterson, M.D.Westlake Village, CA · No drug or device payments recorded (2025) ·
(805) 496-5153 Dr. Cong Zhang, M.D., PH.D.Woodland, CA · $773 in drug and device payments (2025) · Telehealth ·
(530) 662-3961 Dr. Richard Lenon, M.D.Woodside, CA · No drug or device payments recorded (2025) ·
(650) 851-8241 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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