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Hematologists and Oncologists in California

Data updated monthly · Last refresh October 2026

1,582 Hematology & Oncology providers practice in California, including 855 (54%) 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.

1,582providers
855telehealth
Los Angelestop city

Hematology & Oncology by city in California

Choose a city to see providers there.

Hematology & Oncology in Los Angeles152 providers
Hematology & Oncology in San Diego89 providers
Hematology & Oncology in Sacramento77 providers
Hematology & Oncology in San Francisco64 providers
Hematology & Oncology in Orange62 providers
Hematology & Oncology in La Jolla46 providers
Hematology & Oncology in Santa Monica43 providers
Hematology & Oncology in Torrance33 providers
Hematology & Oncology in Fresno31 providers
Hematology & Oncology in Stanford30 providers
Hematology & Oncology in Walnut Creek23 providers
Hematology & Oncology in Newport Beach21 providers
Hematology & Oncology in Rancho Mirage19 providers
Hematology & Oncology in Long Beach18 providers
Hematology & Oncology in Roseville17 providers
Hematology & Oncology in Fountain Valley17 providers
Hematology & Oncology in Beverly Hills16 providers
Hematology & Oncology in Santa Barbara16 providers
Hematology & Oncology in San Jose15 providers
Hematology & Oncology in Oakland14 providers
Hematology & Oncology in Downey14 providers
Hematology & Oncology in Anaheim14 providers
Hematology & Oncology in Irvine13 providers
Hematology & Oncology in Santa Rosa13 providers

Hematology & 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. Sharvina Ziyeh, MD
Torrance, CA · $291 in drug and device payments (2025) · Telehealth · (310) 750-1715
Dr. Syed Jilani, MD
Torrance, CA · $311 in drug and device payments (2025) · Telehealth · (310) 750-3300
Dr. Thomas Lowe, M.D.
Torrance, CA · $577 in drug and device payments (2025) · Telehealth · (310) 750-3300
Dr. Vanessa Dickey, MD
Torrance, CA · $343 in drug and device payments (2025) · Telehealth · (310) 750-3300
Dr. Yenmay Lou
Torrance, CA · No drug or device payments recorded (2025) · (310) 222-2217
Dr. Yutaka Niihara, M.D.
Torrance, CA · No drug or device payments recorded (2025) · (310) 222-5101
Dr. Yu Cheng, M.D.
Tracy, CA · $385 in drug and device payments (2025) · Telehealth · (209) 830-4060
Dr. Jacob Kjelland, MD
Travis Afb, CA · $380 in drug and device payments (2025) · (707) 423-5129
Dr. Joshua Romain, M.D.
Travis Afb, CA · $27 in drug and device payments (2025) · (707) 423-5129
Dr. Vasyl Nesteryuk, DO
Travis Afb, CA · No drug or device payments recorded (2025) · (707) 423-5129
Dr. William Huang, MD
Travis Afb, CA · $80 in drug and device payments (2025) · (707) 423-5129
Dr. Ahrin Koppel, MD
Truckee, CA · No drug or device payments recorded (2025) · (530) 582-6450
Dr. Elaine Kaime, M.D.
Truckee, CA · No drug or device payments recorded (2025) · (530) 582-6450
Dr. Thomas Semrad, M.D., M.A.S.
Truckee, CA · No drug or device payments recorded (2025) · (530) 582-6450
Dr. Samuel Kuo, M.D.
Tulare, CA · $818 in drug and device payments (2025) · Telehealth · (559) 688-8899
Dr. Jincy Clement, M.D.
Turlock, CA · $444 in drug and device payments (2025) · Telehealth · (209) 664-2434
Dr. Mohamed Eldaly, M.D.
Turlock, CA · $302 in drug and device payments (2025) · (209) 669-8300
Dr. Hengbing Wang, M.D.
Ukiah, CA · $2,637 in drug and device payments (2025) · Telehealth · (707) 463-7627
Dr. Camille Adeimy, MD
Upland, CA · No drug or device payments recorded (2025) · (909) 949-2242
Dr. Chau Tran, D.O.
Upland, CA · $17 in drug and device payments (2025) · Telehealth · (909) 949-2242
Dr. Mark Chang, DO
Upland, CA · $375 in drug and device payments (2025) · (909) 949-2242
Dr. Natasha Garg
Upland, CA · No drug or device payments recorded (2025) · Telehealth · (909) 949-2242
Dr. Naveen Gupta, M.D.
Upland, CA · $39 in drug and device payments (2025) · Telehealth · (909) 949-2242
Dr. Neel Talwar, MD
Upland, CA · $39 in drug and device payments (2025) · Telehealth · (909) 949-2242
Dr. Shanmuga Pudunagar Subbiah, MD
Upland, CA · $3,376 in drug and device payments (2025) · Telehealth · (909) 949-2242
Dr. Swapnil Rajurkar, M.D.
Upland, CA · $48 in drug and device payments (2025) · Telehealth · (909) 949-2242
Dr. Brian Vikstrom, M.D.
Vacaville, CA · $1,079 in drug and device payments (2025) · Telehealth · (707) 624-8001
Dr. Chimezie Ubbaonu, MD
Vacaville, CA · No drug or device payments recorded (2025) · Telehealth · (707) 624-4000
Dr. James Long, M.D.
Vacaville, CA · $401 in drug and device payments (2025) · Telehealth · (707) 624-8000
Dr. Andy Su, MD
Valencia, CA · No drug or device payments recorded (2025) · (661) 290-7365
Dr. Hooman Parsi, M.D.
Valencia, CA · $888 in drug and device payments (2025) · Telehealth · (661) 291-3449
Dr. John Barstis, MD
Valencia, CA · No drug or device payments recorded (2025) · (661) 255-5350
Dr. Mihail Obrocea, M.D.
Valencia, CA · No drug or device payments recorded (2025) · (661) 775-5365
Dr. Mohammad Fekrazad, MD
Valencia, CA · No drug or device payments recorded (2025) · Telehealth · (708) 997-4666
Dr. Nu Lu, MD
Valencia, CA · $16 in drug and device payments (2025) · (310) 661-2555
Dr. Aradhana Ghosh, MD
Vallejo, CA · $14 in drug and device payments (2025) · (707) 651-1000
Dr. Bruce Clark, MD
Vallejo, CA · No drug or device payments recorded (2025) · (707) 651-1000
Dr. Chainarong Limvarapuss, MD
Vallejo, CA · $4,852 in drug and device payments (2025) · Telehealth · (707) 551-3300
Dr. Corey Schwartz, MD
Vallejo, CA · No drug or device payments recorded (2025) · Telehealth · (707) 651-1000
Dr. Daniel Lee, M.D.
Vallejo, CA · No drug or device payments recorded (2025) · Telehealth · (707) 651-1077
Dr. Jennifer Suga, M.D.
Vallejo, CA · $200 in drug and device payments (2025) · (707) 651-1077
Dr. Louis Fehrenbacher, MD
Vallejo, CA · No drug or device payments recorded (2025) · (707) 651-1000
Dr. Melissa Whitney, MD
Vallejo, CA · No drug or device payments recorded (2025) · (707) 651-1000
Dr. Rima Nakrani, MD
Vallejo, CA · $150 in drug and device payments (2025) · (707) 651-1000
Dr. Tatjana Kolevska, MD
Vallejo, CA · No drug or device payments recorded (2025) · (707) 651-1000
Dr. Jotika Thompson, M.D.
Van Nuys, CA · $5,153 in drug and device payments (2025) · Telehealth · (818) 574-3798
Dr. Mark Goldstein, MD
Van Nuys, CA · No drug or device payments recorded (2025) · (818) 994-0101
Dr. Nubar Boghossian, M.D.
Van Nuys, CA · $6,508 in drug and device payments (2025) · Telehealth · (818) 574-3798
Dr. Sheila Vasan, M.D.
Van Nuys, CA · $6,061 in drug and device payments (2025) · Telehealth · (818) 782-4104
Dr. Stanley Rossman, MD
Van Nuys, CA · No drug or device payments recorded (2025) · (818) 994-0101

Conditions Hematology & Oncology providers in California commonly treat

Patients often search by condition rather than specialty. These are conditions typically managed by Hematology & Oncology providers. Individual practices vary, so confirm with the provider before booking.

Common questions

How many Hematology & Oncology providers are in California?

There are 1,582 Hematology & Oncology providers with active NPI records practicing in California, according to federal NPPES data refreshed monthly.

Do Hematology & Oncology providers in California offer telehealth?

Yes. 855 of the 1,582 Hematology & Oncology providers in California (about 54%) report offering telehealth services in CMS data.

Which cities in California have the most Hematology & Oncology providers?

Los Angeles (152), San Diego (89), Sacramento (77) have the highest concentration of Hematology & Oncology providers in California.

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

995 of 1,582 Hematology & Oncology providers in California (63%) received at least one payment from a drug or device company in 2025, according to the federal Open Payments program.

What conditions do Hematology & Oncology providers in California treat?

Hematology & Oncology providers commonly treat breast cancer, lung cancer, lymphoma, leukemia, anemia and related conditions. Individual practices vary, so confirm with the provider before booking.

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 Hematologists and Oncologists in California work in independent practices or large health systems?

Among 1,081 Hematologists and Oncologists in California enrolled in Medicare, 11% bill through a solo or small practice with fewer than 10 clinicians, 12% through a mid-size group of 10 to 99, and 77% through a large group or health system with 100 or more clinicians, according to CMS enrollment records.

Which hospitals do Hematologists and Oncologists in California work at?

According to CMS facility affiliation records, the California hospitals where the most Hematologists and Oncologists hold privileges are Ronald Reagan UCLA Medical Center in Los Angeles; Uci Health-Orange in Orange; Santa Monica - UCLA Med Ctr & Orthopaedic Hospital in Santa Monica.

Related reading on HealthcareDiscovery.AI

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Try a city like Tucson, a zip like 85016, or a specialty like psychiatry. For a doctor by name, use the full search.
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 Hematology & Oncology in California? Get featured.