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. Sean Bohen, M.D., PH.D.Palo Alto, CA · $393 in drug and device payments (2025) ·
(650) 723-7621 Dr. Steven Corsello, MDPalo Alto, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 723-4000 Dr. Gargi Upadhyaya, M.D.Pasadena, CA · No drug or device payments recorded (2025) ·
(626) 256-4673 Dr. Laurie Anderson, PACPasadena, CA · $18 in drug and device payments (2025) ·
(626) 441-6098 Dr. Niki Tank, MDPasadena, CA · No drug or device payments recorded (2025) · Telehealth ·
(424) 314-0203 Dr. Yuan Yuan, M.D., PH.D.Pasadena, CA · $17,469 in drug and device payments (2025) · Telehealth ·
(424) 314-0190 Dr. Abinav Baweja, MDPleasanton, CA · $53 in drug and device payments (2025) · Telehealth ·
(925) 416-5470 Dr. Akhil Mehta, DOPleasanton, CA · $383 in drug and device payments (2025) ·
(909) 558-4074 Dr. Barbara Egan, M.D.Pleasanton, CA · No drug or device payments recorded (2025) ·
(925) 734-8130 Dr. Kavitha Raj, MDPleasanton, CA · $241 in drug and device payments (2025) · Telehealth ·
(925) 734-8130 Dr. Rishi Sawhney, M.D.Pleasanton, CA · $8,856 in drug and device payments (2025) · Telehealth ·
(925) 734-8130 Dr. Ruby Maini, MDPleasanton, CA · No drug or device payments recorded (2025) ·
(925) 734-8130 Dr. Thomas Yang Sun, MDPleasanton, CA · $84 in drug and device payments (2025) · Telehealth ·
(925) 734-8130 Dr. Behnam Ebrahimi, M.D.Rancho Cucamonga, CA · $16,726 in drug and device payments (2025) · Telehealth ·
(714) 281-2993 Dr. Christopher Di Simone, M.D.Rancho Mirage, CA · $1,115 in drug and device payments (2025) · Telehealth ·
(760) 346-7655 Dr. Manasa Vulchi, M.D.Rancho Mirage, CA · $138 in drug and device payments (2025) ·
(760) 346-7655 Dr. Shafqat Akhtar, MDRed Bluff, CA · No drug or device payments recorded (2025) ·
(530) 529-6010 Dr. Ajay Verma, M.D.Redding, CA · No drug or device payments recorded (2025) ·
(530) 244-7400 Dr. Behrooz Zidehsarai, MDRedding, CA · No drug or device payments recorded (2025) ·
(530) 244-0720 Dr. Carolyn Collins, MDRedding, CA · No drug or device payments recorded (2025) ·
(530) 244-2223 Dr. Michael Figueroa, M.DRedding, CA · No drug or device payments recorded (2025) ·
(530) 244-2223 Dr. Antoine Sayegh, M.D.Roseville, CA · No drug or device payments recorded (2025) ·
(916) 474-2125 Dr. Casie Shenoy, M.D.Sacramento, CA · $106 in drug and device payments (2025) · Telehealth ·
(916) 734-2011 Dr. Delphine Ong, M.D.Sacramento, CA · No drug or device payments recorded (2025) ·
(916) 733-5300 Dr. Janai Carr-ascher, MD, PHDSacramento, CA · $6,418 in drug and device payments (2025) · Telehealth ·
(916) 734-5959 Dr. John Fisher, M.D.Sacramento, CA · No drug or device payments recorded (2025) ·
(916) 374-5500 Dr. Neil Patel, M.D.Sacramento, CA · $94 in drug and device payments (2025) ·
(505) 822-8563 Dr. Nora Wu, M.D.Sacramento, CA · No drug or device payments recorded (2025) ·
(916) 454-6850 Dr. Randeep Sangha, M.D.Sacramento, CA · No drug or device payments recorded (2025) ·
(916) 734-0517 Dr. Robert Quadro, M.D.Sacramento, CA · No drug or device payments recorded (2025) ·
(916) 733-3333 Dr. Ryan Leibrandt, M.D.Sacramento, CA · No drug or device payments recorded (2025) · Telehealth ·
(916) 734-3772 Dr. Samer Shihabi, M.D.Sacramento, CA · $65 in drug and device payments (2025) · Telehealth ·
(916) 733-5300 Dr. Siao-yi Wang, M.D.Sacramento, CA · No drug or device payments recorded (2025) · Telehealth ·
(916) 734-5959 Dr. Ari Umutyan, M.D.Saint Helena, CA · $1,896 in drug and device payments (2025) · Telehealth ·
(707) 967-5721 Dr. John Gordan, M.D., PH.D.San Bruno, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 615-6000 Dr. Alexander TongSan Diego, CA · $223 in drug and device payments (2025) ·
(800) 926-8273 Dr. April Teitelbaum, MDSan Diego, CA · $560,874 in drug and device payments (2025) ·
(609) 369-2237 Dr. Bassel El-rayes, MDSan Diego, CA · $2,538 in drug and device payments (2025) · Telehealth ·
(800) 926-8273 Dr. Christina SniderSan Diego, CA · No drug or device payments recorded (2025) ·
(800) 926-8273 Dr. Dawood Findakly, MDSan Diego, CA · $4,942 in drug and device payments (2025) · Telehealth ·
(858) 649-5100 Dr. Himabindu Gaddipati, M.D.San Diego, CA · $37 in drug and device payments (2025) ·
(858) 571-2811 Dr. Kaitlyn Dykes, MDSan Diego, CA · $3,230 in drug and device payments (2025) · Telehealth ·
(800) 926-8273 Dr. Karen Yun, M.D.San Diego, CA · No drug or device payments recorded (2025) · Telehealth ·
(800) 926-8273 Dr. Kelly Mccann, M.D., PH.D.San Diego, CA · $47,634 in drug and device payments (2025) · Telehealth ·
(800) 926-8273 Dr. Klaus Wagner, MD PHDSan Diego, CA · No drug or device payments recorded (2025) ·
(858) 552-8585 Dr. Manorama Reddy, M.D.San Diego, CA · $76 in drug and device payments (2025) ·
(619) 583-8700 Dr. Marin Xavier, MDSan Diego, CA · $116,478 in drug and device payments (2025) · Telehealth ·
(619) 849-4469 Dr. Olivia Main, MDSan Diego, CA · $215 in drug and device payments (2025) ·
(800) 926-8273 Dr. Pratik Multani, MDSan Diego, CA · $11,250 in drug and device payments (2025) ·
(858) 705-2846 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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