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. Andrew Rezvani, MDStanford, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 723-4000 Dr. Anjali Sibley, MDStanford, CA · $487 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Arash Alizadeh, MD, PHDStanford, CA · $5,903 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Arnav Mehta, MDStanford, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 723-4000 Dr. Brian Sworder, MDStanford, CA · $99 in drug and device payments (2025) ·
(650) 723-4000 Dr. Bryant Sheh, MDStanford, CA · $509 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Christopher Chen, MDStanford, CA · $63 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Colin BergstromStanford, CA · $91 in drug and device payments (2025) ·
(650) 723-4000 Dr. David Kurtz, MDStanford, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 723-4000 Dr. Divya Parikh, MDStanford, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 723-4000 Dr. Donald Lombardi, MDStanford, CA · $135 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Douglas Blayney, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Fangdi Sun, MDStanford, CA · $33 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Fauzia Riaz, MDStanford, CA · $5,053 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Frank Stockdale, MD., PH.D.Stanford, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 723-4000 Dr. Gabriel Mannis, MDStanford, CA · $29,416 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. George Sledge, M.D.Stanford, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 723-4000 Dr. Gerneiva Parkinson, MD MHSStanford, CA · $348 in drug and device payments (2025) ·
(650) 724-4397 Dr. Gregory Heestand, M.D.Stanford, CA · $303 in drug and device payments (2025) · Telehealth ·
(650) 498-6000 Dr. Haluk Tezcan, MDStanford, CA · $29 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Harlan Pinto, M.D.Stanford, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 723-4000 Dr. Haruka Itakura, M.D.Stanford, CA · $4,659 in drug and device payments (2025) · Telehealth ·
(650) 498-5710 Dr. Heather Wakelee, MDStanford, CA · $22,236 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Howard Lee, MDStanford, CA · $27 in drug and device payments (2025) · Telehealth ·
(650) 498-6000 Dr. Hyunseok Kang, MDStanford, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 723-4000 Dr. James Dickerson, MDStanford, CA · $161 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. James Ford, MDStanford, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 723-4000 Dr. Jennifer Caswell-jin, MDStanford, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 723-4000 Dr. Joel Neal, M.D., PH.D.Stanford, CA · $37,752 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. John Lee, M.D., PH.D.Stanford, CA · $34 in drug and device payments (2025) ·
(650) 724-9116 Dr. Jonathan Lee, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Jordan Goldstein, MDStanford, CA · $2,010 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Joseph Schroers-martin, MDStanford, CA · $11,120 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Julia Ransohoff, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Kavitha Ramchandran, MDStanford, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 723-4000 Dr. Kimberly Loo, MDStanford, CA · $54 in drug and device payments (2025) ·
(650) 723-4000 Dr. Kim-son NguyenStanford, CA · $425 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Klaus Porzig, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-7627 Dr. Kristen Ganjoo, MDStanford, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 723-4000 Dr. Lauren Maeda, M.D.Stanford, CA · $1,646 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Lekha Mikkilineni, M.DStanford, CA · $2,690 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Lidia Schapira, MDStanford, CA · $147 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Lipika Goyal, MDStanford, CA · $19,370 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Maggie Zhou, MDStanford, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 723-4000 Dr. Manali Patel, MD, MPHStanford, CA · $3,050 in drug and device payments (2025) ·
(650) 723-4000 Dr. Mark Pegram, M.D.Stanford, CA · $41,055 in drug and device payments (2025) ·
(650) 723-4000 Dr. Matthew Frank, M.D. PH.D.Stanford, CA · $21,360 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Maximilian Julve, MDStanford, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 723-4000 Dr. Melinda Telli, MDStanford, CA · $17,001 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Mengni Guo, MDStanford, CA · $302 in drug and device payments (2025) ·
(650) 723-4000 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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