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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. Rajesh Belani, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (858) 637-7888
Dr. Rana Mckay, MD
San Diego, CA · $88,428 in drug and device payments (2025) · Telehealth · (800) 926-8273
Dr. Raymond Heung, M.D.
San Diego, CA · $40 in drug and device payments (2025) · (858) 874-8868
Dr. Saeeda Kirmani, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (858) 552-8585
Dr. Sandip Patel, M.D.
San Diego, CA · $37,848 in drug and device payments (2025) · Telehealth · (800) 926-8273
Dr. Scott Godfrey, DO
San Diego, CA · $1,699 in drug and device payments (2025) · Telehealth · (619) 528-5000
Dr. Shankar Sundaram, M.D.
San Diego, CA · $2,491 in drug and device payments (2025) · Telehealth · (858) 939-6622
Dr. Shira Paul, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (619) 532-7300
Dr. Stephanie Ossowski
San Diego, CA · No drug or device payments recorded (2025) · Telehealth · (877) 236-0333
Dr. Stephen Howell, M.D.
San Diego, CA · No drug or device payments recorded (2025) · (800) 926-8273
Dr. Steven Eisenberg, D.O.
San Diego, CA · $1,237 in drug and device payments (2025) · Telehealth · (588) 649-5100
Dr. Steven Kossman, M.D.
San Diego, CA · $17 in drug and device payments (2025) · Telehealth · (619) 287-9910
Dr. Tiffany Tanaka, M.D.
San Diego, CA · $14,572 in drug and device payments (2025) · Telehealth · (619) 290-7497
Dr. Tro Sekayan, MD
San Diego, CA · $109 in drug and device payments (2025) · Telehealth · (800) 926-8273
Dr. Tyler Stewart, M.D.
San Diego, CA · $7,011 in drug and device payments (2025) · Telehealth · (800) 926-8273
Dr. Wendy Levin, MD
San Diego, CA · No drug or device payments recorded (2025) · (858) 622-8019
Dr. Wesleigh Edwards, MD, PHD
San Diego, CA · $2,382 in drug and device payments (2025) · Telehealth · (619) 849-4469
Dr. William Go, M.D., PH.D.
San Diego, CA · No drug or device payments recorded (2025) · (888) 309-8273
Dr. Xuemei Ye, M.D.
San Diego, CA · $29 in drug and device payments (2025) · (877) 236-0333
Dr. Yu-wei Chen, M.D.
San Diego, CA · $5,142 in drug and device payments (2025) · Telehealth · (800) 926-8273
Dr. Aaron Logan, MD, PHD
San Francisco, CA · $97,909 in drug and device payments (2025) · Telehealth · (415) 353-2421
Dr. Alain Algazi, M.D.
San Francisco, CA · No drug or device payments recorded (2025) · Telehealth · (415) 476-0624
Dr. Alfonso Molina, MD
San Francisco, CA · No drug or device payments recorded (2025) · (415) 353-2421
Dr. Alfredo Lopez, MD
San Francisco, CA · No drug or device payments recorded (2025) · (415) 833-2000
Dr. Amy Nelson, MD
San Francisco, CA · $41 in drug and device payments (2025) · (415) 833-2000
Dr. Andrea Harzstark, MD
San Francisco, CA · No drug or device payments recorded (2025) · (415) 353-7171
Dr. Ann Lanzerotti, M.D.
San Francisco, CA · No drug or device payments recorded (2025) · (415) 931-7661
Dr. Arpita Desai, M.D.
San Francisco, CA · $6,826 in drug and device payments (2025) · Telehealth · (415) 476-4616
Dr. Barbara Jensen, M.D.
San Francisco, CA · No drug or device payments recorded (2025) · (415) 221-4810
Dr. Brian Schulte
San Francisco, CA · $1,141 in drug and device payments (2025) · Telehealth · (415) 885-3882
Dr. Carling Ursem, MD
San Francisco, CA · $16 in drug and device payments (2025) · Telehealth · (415) 476-1000
Dr. Caroline Behler, M.D., M.S.
San Francisco, CA · $1,450 in drug and device payments (2025) · Telehealth · (415) 923-3012
Dr. Carrie Ho, M.D.
San Francisco, CA · $209 in drug and device payments (2025) · Telehealth · (415) 353-9327
Dr. Claire Mulvey, M.D.
San Francisco, CA · $2,449 in drug and device payments (2025) · Telehealth · (415) 353-9888
Dr. Collin Blakely, MD
San Francisco, CA · $4,952 in drug and device payments (2025) · Telehealth · (415) 885-7276
Dr. Daniel Kwon, MD
San Francisco, CA · $145 in drug and device payments (2025) · Telehealth · (415) 476-1528
Dr. Daniel Maslyar, MD
San Francisco, CA · $135 in drug and device payments (2025) · (415) 221-4810
Dr. Darren Pan
San Francisco, CA · $7,503 in drug and device payments (2025) · Telehealth · (415) 476-1000
Dr. David Oh
San Francisco, CA · No drug or device payments recorded (2025) · Telehealth · (415) 353-2421
Dr. Derrick Tao, MD
San Francisco, CA · $164 in drug and device payments (2025) · Telehealth · (415) 353-7800
Dr. Edward Chan, M.D.
San Francisco, CA · $1,188 in drug and device payments (2025) · (415) 989-3390
Dr. Edward Maldonado, M.D.
San Francisco, CA · $35 in drug and device payments (2025) · Telehealth · (415) 476-4616
Dr. Elizabeth Read, M.D.
San Francisco, CA · No drug or device payments recorded (2025) · (415) 779-6615
Dr. Francisco Martinez, MD
San Francisco, CA · No drug or device payments recorded (2025) · Telehealth · (415) 833-9183
Dr. Gauri Kelekar, M.D.
San Francisco, CA · $202 in drug and device payments (2025) · Telehealth · (415) 668-0160
Dr. Hugh Lawrence, M.D.
San Francisco, CA · No drug or device payments recorded (2025) · (415) 221-4810
Dr. Inga Lennes, M.D.
San Francisco, CA · No drug or device payments recorded (2025) · (415) 885-3882
Dr. Jahan Tavakoli, M.D.
San Francisco, CA · $213 in drug and device payments (2025) · (415) 833-5156
Dr. James Lee, M.D.
San Francisco, CA · $226 in drug and device payments (2025) · Telehealth · (415) 353-2421
Dr. Jeffrey Venstrom, MD
San Francisco, CA · No drug or device payments recorded (2025) · (415) 353-2421

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.