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Radiation Oncologists in California

Data updated monthly · Last refresh October 2026

734 Radiation Oncology providers practice in California, including 310 (42%) offering telehealth. The largest concentration is in Los Angeles. 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.

734providers
310telehealth
Los Angelestop city

Radiation Oncology by city in California

Choose a city to see providers there.

Radiation Oncology in Los Angeles97 providers
Radiation Oncology in San Francisco46 providers
Radiation Oncology in Stanford43 providers
Radiation Oncology in San Diego43 providers
Radiation Oncology in Sacramento32 providers
Radiation Oncology in Orange19 providers
Radiation Oncology in Duarte16 providers
Radiation Oncology in La Jolla15 providers
Radiation Oncology in Palo Alto14 providers
Radiation Oncology in San Jose11 providers
Radiation Oncology in Loma Linda11 providers
Radiation Oncology in West Hollywood10 providers
Radiation Oncology in Fresno9 providers
Radiation Oncology in Santa Clara9 providers
Radiation Oncology in Long Beach9 providers
Radiation Oncology in Redding8 providers
Radiation Oncology in Fountain Valley7 providers
Radiation Oncology in Santa Barbara7 providers
Radiation Oncology in Dublin7 providers
Radiation Oncology in Torrance7 providers
Radiation Oncology in Irvine7 providers
Radiation Oncology in Chula Vista6 providers
Radiation Oncology in Newport Beach6 providers
Radiation Oncology in Oakland6 providers

Radiation 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. Kaveh Zakeri, M.D.
San Jose, CA · $1,028 in drug and device payments (2025) · (408) 885-6300
Dr. Ly Do, M.D.
San Jose, CA · $1,645 in drug and device payments (2025) · (408) 729-4673
Dr. Morteza Dowlatshahi, M.D.
San Jose, CA · $1,686 in drug and device payments (2025) · (408) 729-4673
Dr. Susan Hiniker, M.D.
San Jose, CA · $35 in drug and device payments (2025) · Telehealth · (408) 885-6305
Dr. Tri Do, MD
San Jose, CA · $48 in drug and device payments (2025) · (408) 835-9601
Dr. Xingzhe Li
San Jose, CA · $19 in drug and device payments (2025) · Telehealth · (408) 885-5000
Dr. Yeeyie Fogarty, M.D.
San Leandro, CA · No drug or device payments recorded (2025) · (510) 454-1000
Dr. Jeffrey Wu, M.D.
San Luis Obispo, CA · $19 in drug and device payments (2025) · (805) 541-1932
Dr. Jonathan Stella, MD
San Luis Obispo, CA · No drug or device payments recorded (2025) · (805) 541-1932
Dr. Lauren Tait, M.D.
San Luis Obispo, CA · No drug or device payments recorded (2025) · Telehealth · (805) 925-2529
Dr. Paul Pagnini, M.D.
San Luis Obispo, CA · No drug or device payments recorded (2025) · Telehealth · (805) 439-9209
Dr. Robert Fishburn, MD
San Luis Obispo, CA · No drug or device payments recorded (2025) · (805) 541-1932
Dr. Linda Chak, M.D.
San Marino, CA · No drug or device payments recorded (2025) · (626) 716-2076
Dr. Al Taira, MD
San Mateo, CA · $192 in drug and device payments (2025) · Telehealth · (650) 696-4509
Dr. Clara Choi, M.D., PH.D.
San Mateo, CA · No drug or device payments recorded (2025) · Telehealth · (650) 212-7387
Dr. Dhara Macdermed, MD
San Mateo, CA · $151 in drug and device payments (2025) · Telehealth · (650) 696-4509
Dr. Brenda Shank, MD, PHD
San Pablo, CA · No drug or device payments recorded (2025) · (510) 970-5667
Dr. Madhu Shetti, M.D.
San Pablo, CA · $179 in drug and device payments (2025) · Telehealth · (313) 871-9346
Dr. Joseph Castro, M.D.
San Rafael, CA · No drug or device payments recorded (2025) · (415) 457-1587
Dr. Chu-pei Feng, M.D.
Santa Ana, CA · $57 in drug and device payments (2025) · (714) 835-8520
Dr. Ernest Ngo, M.D.
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 835-8520
Dr. Sharon Lee, M.D.
Santa Ana, CA · $138 in drug and device payments (2025) · (714) 835-8520
Dr. Carol Pattillo, MD
Santa Barbara, CA · No drug or device payments recorded (2025) · (805) 969-1558
Dr. George Cheng, M.D.
Santa Barbara, CA · $20 in drug and device payments (2025) · Telehealth · (805) 682-7300
Dr. Hyo Kim, M.D.
Santa Barbara, CA · No drug or device payments recorded (2025) · Telehealth · (805) 879-0670
Dr. Justin Voog, M.D., PH.D.
Santa Barbara, CA · $280 in drug and device payments (2025) · Telehealth · (805) 879-0650
Dr. Lindsay Blount, M.D.
Santa Barbara, CA · No drug or device payments recorded (2025) · (805) 682-7300
Dr. Shane Cotter, M.D.
Santa Barbara, CA · No drug or device payments recorded (2025) · Telehealth · (805) 682-7300
Dr. Wonsuk Suh, M.D., M.P.H.
Santa Barbara, CA · $297 in drug and device payments (2025) · (805) 682-7300
Dr. Anita Lee, MD
Santa Clara, CA · No drug or device payments recorded (2025) · (408) 851-8000
Dr. Benjamin Fisch, MD
Santa Clara, CA · No drug or device payments recorded (2025) · (408) 236-6400
Dr. Brian Missett, MD
Santa Clara, CA · No drug or device payments recorded (2025) · (408) 236-6400
Dr. Jagdeep Raince, MD
Santa Clara, CA · No drug or device payments recorded (2025) · (408) 851-8000
Dr. Joseph Hastings, MD, MPH
Santa Clara, CA · No drug or device payments recorded (2025) · (408) 851-8000
Dr. Radhika Sreeraman Kumar, M.D.
Santa Clara, CA · $52 in drug and device payments (2025) · (408) 851-8000
Dr. Samantha Seaward, MD
Santa Clara, CA · No drug or device payments recorded (2025) · (408) 236-6400
Dr. Subir Nag, MD
Santa Clara, CA · No drug or device payments recorded (2025) · (408) 236-6400
Dr. Wilson Mai, MD, PHD
Santa Clara, CA · No drug or device payments recorded (2025) · (408) 851-1000
Dr. Charlotte Kim, M.D.
Santa Cruz, CA · $79 in drug and device payments (2025) · Telehealth · (831) 462-3050
Dr. Jay Meisel, M.D.
Santa Cruz, CA · $152 in drug and device payments (2025) · Telehealth · (831) 462-3050
Dr. Michael Dworkin, MD
Santa Cruz, CA · $231 in drug and device payments (2025) · Telehealth · (831) 462-3050
Dr. Dylan Conroy, MD
Santa Maria, CA · $140 in drug and device payments (2025) · (805) 925-2529
Dr. Jonathan Vanwickle, MD
Santa Maria, CA · $52 in drug and device payments (2025) · (805) 925-2529
Dr. Sheri Marquez, MD
Santa Maria, CA · $38 in drug and device payments (2025) · (805) 925-2529
Dr. Lisa Chaiken, MD
Santa Monica, CA · $781 in drug and device payments (2025) · (310) 829-8913
Dr. Oscar Streeter, M.D.
Santa Monica, CA · $244 in drug and device payments (2025) · (888) 580-5900
Dr. Robert Wollman, MD
Santa Monica, CA · $15 in drug and device payments (2025) · Telehealth · (310) 829-8913
Dr. Ronald Thompson, MD
Santa Monica, CA · No drug or device payments recorded (2025) · (310) 829-8913
Dr. Cindy Scharfen, M.D.
Santa Rosa, CA · $1,065 in drug and device payments (2025) · Telehealth · (707) 528-1050
Dr. Frederick David, M.D.
Santa Rosa, CA · $989 in drug and device payments (2025) · Telehealth · (707) 528-1050

Common questions

How many Radiation Oncology providers are in California?

There are 734 Radiation Oncology providers with active NPI records practicing in California, according to federal NPPES data refreshed monthly.

Do Radiation Oncology providers in California offer telehealth?

Yes. 310 of the 734 Radiation Oncology providers in California (about 42%) report offering telehealth services in CMS data.

Which cities in California have the most Radiation Oncology providers?

Los Angeles (97), San Francisco (46), Stanford (43) have the highest concentration of Radiation Oncology providers in California.

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

359 of 734 Radiation Oncology providers in California (49%) 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 Radiation Oncologists in California work in independent practices or large health systems?

Among 516 Radiation Oncologists in California enrolled in Medicare, 16% bill through a solo or small practice with fewer than 10 clinicians, 17% through a mid-size group of 10 to 99, and 67% through a large group or health system with 100 or more clinicians, according to CMS enrollment records.

Which hospitals do Radiation Oncologists in California work at?

According to CMS facility affiliation records, the California hospitals where the most Radiation Oncologists hold privileges are UCSF Medical Center in San Francisco; Stanford Health Care in Stanford; UC San Diego Health Hillcrest - Hillcrest Med Ctr in San Diego.

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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 Radiation Oncology in California? Get featured.