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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. Lay Owyong, MD
Stockton, CA · No drug or device payments recorded (2025) · (209) 476-2000
Dr. Ravleen Grewal, MD
Stockton, CA · $1,115 in drug and device payments (2025) · Telehealth · (209) 466-2626
Dr. Eunpi Cho, M.D.
Sunnyvale, CA · No drug or device payments recorded (2025) · (408) 739-6000
Dr. Howard Lee, MD
Sunnyvale, CA · No drug or device payments recorded (2025) · Telehealth · (408) 730-2800
Dr. Huy Nguyen, MD
Sunnyvale, CA · $754 in drug and device payments (2025) · Telehealth · (408) 730-2800
Dr. Monique De Bruin, M.D.
Sunnyvale, CA · No drug or device payments recorded (2025) · Telehealth · (650) 934-7811
Dr. Susan Lessin, M.D.
Sunnyvale, CA · No drug or device payments recorded (2025) · (408) 730-5100
Dr. Tanya Gupta, MD
Sunnyvale, CA · $2,152 in drug and device payments (2025) · Telehealth · (408) 730-2800
Dr. Leland Powell, MD
Sylmar, CA · $273 in drug and device payments (2025) · (818) 364-3205
Dr. Megan Reddy
Sylmar, CA · $835 in drug and device payments (2025) · (747) 210-3540
Dr. Phillis Wu, M.D.
Sylmar, CA · $625 in drug and device payments (2025) · (818) 364-3031
Dr. Phyllis Kim, M.D.
Sylmar, CA · $405 in drug and device payments (2025) · (818) 364-3205
Dr. Johnny Chang, MD
Tarzana, CA · $153,949 in drug and device payments (2025) · (818) 981-3818
Dr. Mazen Jizzini, MD
Tarzana, CA · $1,359 in drug and device payments (2025) · Telehealth · (818) 981-3818
Dr. Ryan Ponec, MD
Tarzana, CA · $31 in drug and device payments (2025) · Telehealth · (818) 981-3818
Dr. Waheed Murad, M.D, MRCP
Temecula, CA · $150 in drug and device payments (2025) · Telehealth · (510) 378-0669
Dr. Sanjay Ganpule, M.D.
Templeton, CA · No drug or device payments recorded (2025) · (805) 434-1038
Dr. Ashwin Kashyap, M.D.
Thousand Oaks, CA · $63 in drug and device payments (2025) · Telehealth · (805) 496-2949
Dr. Bahareh Bahadini, MD
Thousand Oaks, CA · $31 in drug and device payments (2025) · Telehealth · (805) 496-2949
Dr. Bassam Ghanem, MD
Thousand Oaks, CA · $3,094 in drug and device payments (2025) · (805) 496-2949
Dr. Harry Menco, MD
Thousand Oaks, CA · No drug or device payments recorded (2025) · (805) 496-2949
Dr. Sabrina Hardy, MD
Thousand Oaks, CA · $56 in drug and device payments (2025) · Telehealth · (805) 496-2949
Dr. Sumita Bhatta, MD
Thousand Oaks, CA · No drug or device payments recorded (2025) · (818) 256-9191
Dr. Adam Singer
Torrance, CA · $14,531 in drug and device payments (2025) · Telehealth · (310) 325-8252
Dr. Adnan Khan, M.D.
Torrance, CA · $199 in drug and device payments (2025) · Telehealth · (310) 750-1715
Dr. Aileen Novero, M.D.
Torrance, CA · $143 in drug and device payments (2025) · Telehealth · (424) 212-6200
Dr. Amy Cummings
Torrance, CA · $24,421 in drug and device payments (2025) · Telehealth · (310) 325-8252
Dr. Andrew Hwang, MD
Torrance, CA · $1,615 in drug and device payments (2025) · (424) 306-8220
Dr. Arshad Ahad, MD
Torrance, CA · No drug or device payments recorded (2025) · Telehealth · (424) 375-7209
Dr. Bryan Chan, MD, MPH
Torrance, CA · $651 in drug and device payments (2025) · (424) 306-4000
Dr. Charity Huang, MD
Torrance, CA · $8,788 in drug and device payments (2025) · (310) 222-2345
Dr. David Chan, MD
Torrance, CA · $505 in drug and device payments (2025) · Telehealth · (310) 750-3300
Dr. Diane Prager, MD
Torrance, CA · $31 in drug and device payments (2025) · Telehealth · (310) 325-8252
Dr. Hugo Hool, MD
Torrance, CA · $365 in drug and device payments (2025) · Telehealth · (310) 750-3300
Dr. Jennifer Lee, M.D.
Torrance, CA · $1,770 in drug and device payments (2025) · (424) 306-8220
Dr. Jessica Yan, M.D.
Torrance, CA · $516 in drug and device payments (2025) · (310) 222-2217
Dr. Kamila Bakirhan, M.D.
Torrance, CA · $862 in drug and device payments (2025) · Telehealth · (310) 935-4525
Dr. Kouichi Tanaka, M.D.
Torrance, CA · No drug or device payments recorded (2025) · (310) 222-3695
Dr. Manan Shah, MD
Torrance, CA · $84 in drug and device payments (2025) · Telehealth · (310) 829-5471
Dr. Marcin Dragan, M.D.
Torrance, CA · No drug or device payments recorded (2025) · Telehealth · (424) 306-8220
Dr. Marian Varda, DO
Torrance, CA · $854 in drug and device payments (2025) · (310) 222-2345
Dr. Michael Chung, M.D.
Torrance, CA · $8,067 in drug and device payments (2025) · Telehealth · (424) 435-1037
Dr. Michael Nguyen, M.D.
Torrance, CA · $7,931 in drug and device payments (2025) · Telehealth · (424) 435-1037
Dr. Michael Shodiya
Torrance, CA · $304 in drug and device payments (2025) · Telehealth · (310) 794-7700
Dr. Natasha Banerjee, M.D.
Torrance, CA · $55 in drug and device payments (2025) · Telehealth · (310) 222-2409
Dr. Norma Maala Sarao, M.D.
Torrance, CA · No drug or device payments recorded (2025) · (310) 371-2288
Dr. Reza Mostofi, M.D.
Torrance, CA · $316 in drug and device payments (2025) · Telehealth · (310) 750-1715
Dr. Rodina Vatanparast, M.D.
Torrance, CA · $143 in drug and device payments (2025) · Telehealth · (424) 212-6200
Dr. Rowan Chlebowski, M.D., PHD
Torrance, CA · No drug or device payments recorded (2025) · (310) 222-5101
Dr. Sarah Tomassetti, M.D.
Torrance, CA · $2,449 in drug and device payments (2025) · (310) 745-2882

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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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.