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. Sandra AlgazeLos Angeles, CA · $7,160 in drug and device payments (2025) · Telehealth ·
(323) 865-3000 Dr. Sarmad Sadeghi, MD, MS, PHDLos Angeles, CA · No drug or device payments recorded (2025) · Telehealth ·
(323) 865-3000 Dr. Stephen Liu, MDLos Angeles, CA · $131,599 in drug and device payments (2025) · Telehealth ·
(323) 865-3105 Dr. Steven Grossman, MDLos Angeles, CA · No drug or device payments recorded (2025) ·
(323) 865-0862 Dr. Syma Iqbal, M.D.Los Angeles, CA · $59,513 in drug and device payments (2025) · Telehealth ·
(323) 865-3105 Dr. Varsha Tulpule, M.D.Los Angeles, CA · $697 in drug and device payments (2025) · Telehealth ·
(323) 865-3105 Dr. Shane Dormady, M.D., PHDLos Gatos, CA · $1,395 in drug and device payments (2025) · Telehealth ·
(408) 866-3989 Dr. Shruti Sheth, M.D., MSC.Menlo Park, CA · No drug or device payments recorded (2025) ·
(650) 388-6085 Dr. Parminder Sidhu, MDMerced, CA · No drug or device payments recorded (2025) ·
(209) 564-5000 Dr. Fen Jiang, MDMission Viejo, CA · $3,197 in drug and device payments (2025) · Telehealth ·
(949) 347-0600 Dr. Ming Zhou, MDModesto, CA · $3,493 in drug and device payments (2025) · Telehealth ·
(209) 524-1211 Dr. Thomas Reynolds, MDMontebello, CA · $2,359 in drug and device payments (2025) ·
(323) 278-4400 Dr. Eric Chang, MDMonterey Park, CA · No drug or device payments recorded (2025) ·
(626) 571-8080 Dr. Jennifer Sanbar, M.D.Montrose, CA · No drug or device payments recorded (2025) ·
(818) 640-6860 Dr. Iulia Giuroiu, M.D.Mountain View, CA · $43 in drug and device payments (2025) · Telehealth ·
(650) 988-8338 Dr. Rosendo So-rosillo, MDMountain View, CA · No drug or device payments recorded (2025) ·
(650) 934-7600 Dr. Shiva SinghalMountain View, CA · $84 in drug and device payments (2025) · Telehealth ·
(605) 988-8338 Dr. Achala Doraiswamy, MDMurrieta, CA · $5,320 in drug and device payments (2025) · Telehealth ·
(760) 733-9191 Dr. Michael Henderson, M.D.Napa, CA · No drug or device payments recorded (2025) ·
(707) 377-1007 Dr. Richard AndersonNapa, CA · No drug or device payments recorded (2025) ·
(707) 257-2591 Dr. Vandana Sharma, M.D., PHD.Newark, CA · No drug or device payments recorded (2025) · Telehealth ·
(510) 248-1860 Dr. Alain Mita, MDNewport Beach, CA · $4,832 in drug and device payments (2025) · Telehealth ·
(949) 764-4060 Dr. Diana Hanna, M.D.Newport Beach, CA · No drug or device payments recorded (2025) · Telehealth ·
(949) 764-6130 Dr. Larry Strieff, M.D.Oakland, CA · No drug or device payments recorded (2025) ·
(510) 830-3100 Dr. Vinona Bhatia, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 752-1214 Dr. Farshid Dayyani, M.D., PH.D.Orange, CA · $289,318 in drug and device payments (2025) · Telehealth ·
(714) 456-8000 Dr. Jennifer Valerin, M.D.Orange, CA · $104,358 in drug and device payments (2025) · Telehealth ·
(714) 456-8000 Dr. Samuel Ejadi, MDOrange, CA · No drug or device payments recorded (2025) ·
(714) 456-8000 Dr. Sayeh Lavasani, MDOrange, CA · $34,420 in drug and device payments (2025) · Telehealth ·
(714) 880-7812 Dr. Susan O'brien, M.D.Orange, CA · $47,527 in drug and device payments (2025) · Telehealth ·
(714) 456-8000 Dr. Victoria Villaflor, M.D.Orange, CA · $14,389 in drug and device payments (2025) · Telehealth ·
(714) 456-8888 Dr. Jay Klarnet, MDOxnard, CA · $1,075 in drug and device payments (2025) ·
(805) 988-7080 Dr. Lawrence Leichman, M.D.Palm Springs, CA · No drug or device payments recorded (2025) ·
(760) 416-4860 Dr. Scott Brook, M.D.Palm Springs, CA · $1,322 in drug and device payments (2025) ·
(760) 416-4721 Dr. Alexander Colevas, MDPalo Alto, CA · $117 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Alice Fan, M.D.Palo Alto, CA · $204 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Ann Lowe, M.D.Palo Alto, CA · No drug or device payments recorded (2025) ·
(650) 323-6614 Dr. Curtis Chong, MD, PHDPalo Alto, CA · $1,226 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. David Leibowitz, MDPalo Alto, CA · No drug or device payments recorded (2025) ·
(650) 321-4121 Dr. Eric Humke, M.D., PH.D.Palo Alto, CA · $135 in drug and device payments (2025) ·
(650) 498-6000 Dr. Ina Rhee, MD PHDPalo Alto, CA · No drug or device payments recorded (2025) ·
(650) 493-5000 Dr. Jane Huang, MDPalo Alto, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 498-6000 Dr. Jennie CrewsPalo Alto, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 723-4000 Dr. Joshua Gruber, M.D.Palo Alto, CA · $15 in drug and device payments (2025) ·
(650) 498-6004 Dr. Mark Lee, MD, PHDPalo Alto, CA · No drug or device payments recorded (2025) ·
(650) 723-7621 Dr. Milana Dolezal, M.D.Palo Alto, CA · $6,587 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Millie Das, MDPalo Alto, CA · $47,811 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Natalia Colocci, MDPalo Alto, CA · $1,157 in drug and device payments (2025) · Telehealth ·
(650) 321-4121 Dr. Paula Kushlan, MDPalo Alto, CA · No drug or device payments recorded (2025) ·
(209) 603-8524 Dr. Pauline Funchain, M.D.Palo Alto, CA · No drug or device payments recorded (2025) · Telehealth ·
(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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