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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. Jonathan Simons, M.D.
Santa Monica, CA · No drug or device payments recorded (2025) · (310) 570-4712
Dr. Julia Labarbera, NP
Santa Monica, CA · $701 in drug and device payments (2025) · Telehealth · (310) 998-4747
Dr. Kathryn Henick, M.D.
Santa Monica, CA · No drug or device payments recorded (2025) · (310) 453-5654
Dr. Madelaine Kuiper, NP
Santa Monica, CA · $1,921 in drug and device payments (2025) · Telehealth · (310) 998-4747
Dr. Megan Ennis, NP
Santa Monica, CA · No drug or device payments recorded (2025) · (310) 826-5471
Dr. Michael Oh, MD
Santa Monica, CA · $119 in drug and device payments (2025) · Telehealth · (310) 829-5471
Dr. Neal Chawla, M.D./ M.B.B.S.
Santa Monica, CA · $5,144 in drug and device payments (2025) · Telehealth · (310) 552-9999
Dr. Nicolaos Palaskas, M.D.
Santa Monica, CA · $419 in drug and device payments (2025) · Telehealth · (310) 998-4747
Dr. Nikeshan Jeyakumar, MD
Santa Monica, CA · No drug or device payments recorded (2025) · Telehealth · (310) 829-5471
Dr. Nikita Baclig, M.D.
Santa Monica, CA · $2,587 in drug and device payments (2025) · Telehealth · (310) 829-5471
Dr. Olga Olevsky, M.D.
Santa Monica, CA · $630 in drug and device payments (2025) · Telehealth · (310) 829-5471
Dr. Omid Hamid, M.D.
Santa Monica, CA · $108,183 in drug and device payments (2025) · Telehealth · (310) 582-7900
Dr. Peter Boasberg, MD
Santa Monica, CA · No drug or device payments recorded (2025) · (310) 582-7900
Dr. Richard Finn, MD
Santa Monica, CA · $106,972 in drug and device payments (2025) · Telehealth · (310) 829-5471
Dr. Saeed Sadeghi, MD
Santa Monica, CA · $98,174 in drug and device payments (2025) · Telehealth · (310) 829-5471
Dr. Sean Fischer, M.D.
Santa Monica, CA · $494 in drug and device payments (2025) · Telehealth · (310) 453-5654
Dr. Silvana Martino, D.O.
Santa Monica, CA · $46,837 in drug and device payments (2025) · (310) 582-7900
Dr. Sophie Carlson, MD
Santa Monica, CA · No drug or device payments recorded (2025) · (310) 829-5471
Dr. Steven O'day, M.D.
Santa Monica, CA · No drug or device payments recorded (2025) · (310) 829-8317
Dr. Steven Tsai, MD
Santa Monica, CA · $147 in drug and device payments (2025) · Telehealth · (310) 829-5471
Dr. Steven Tucker, M.D.
Santa Monica, CA · No drug or device payments recorded (2025) · (310) 582-7900
Dr. Steven Wong, MD
Santa Monica, CA · $1,136 in drug and device payments (2025) · (310) 552-9999
Dr. Thompson Adams, MD
Santa Monica, CA · No drug or device payments recorded (2025) · (310) 829-5471
Dr. Timothy Kristedja, MD
Santa Monica, CA · $240 in drug and device payments (2025) · Telehealth · (310) 453-5654
Dr. William Isacoff, M.D.
Santa Monica, CA · $801 in drug and device payments (2025) · (310) 824-4133
Dr. Zev Wainberg, MD
Santa Monica, CA · $224,351 in drug and device payments (2025) · Telehealth · (310) 829-5471
Dr. Christine Kaiser, M.D.
Santa Rosa, CA · No drug or device payments recorded (2025) · Telehealth · (707) 393-4000
Dr. Helen Collins, M.D.
Santa Rosa, CA · No drug or device payments recorded (2025) · (707) 546-4062
Dr. Ian Anderson, M.D.
Santa Rosa, CA · $778 in drug and device payments (2025) · Telehealth · (707) 528-1050
Dr. Jarrod Holmes, MD
Santa Rosa, CA · $60,265 in drug and device payments (2025) · Telehealth · (707) 528-1050
Dr. Jeffrey Ye, MD
Santa Rosa, CA · No drug or device payments recorded (2025) · (707) 571-4000
Dr. Justin Grenet, MD
Santa Rosa, CA · No drug or device payments recorded (2025) · (707) 528-1050
Dr. Leroy Wayne Keiser, M.D.
Santa Rosa, CA · $13,345 in drug and device payments (2025) · Telehealth · (707) 528-1050
Dr. Marek Bozdech, M.D.
Santa Rosa, CA · No drug or device payments recorded (2025) · (707) 546-4062
Dr. Nicolaj Andersen, MD
Santa Rosa, CA · No drug or device payments recorded (2025) · (707) 571-4000
Dr. Peter Brett, M.D.
Santa Rosa, CA · No drug or device payments recorded (2025) · (707) 521-7750
Dr. Vineeth Tatineni, M.D.
Santa Rosa, CA · No drug or device payments recorded (2025) · Telehealth · (707) 571-3755
Dr. Yao Yao Pollock, MD
Santa Rosa, CA · $540 in drug and device payments (2025) · Telehealth · (707) 528-1050
Dr. Zeyad Kanaan, M.D.
Santa Rosa, CA · No drug or device payments recorded (2025) · Telehealth · (707) 521-7750
Dr. George Somlo, MD
Seal Beach, CA · No drug or device payments recorded (2025) · (562) 596-6038
Dr. Sujie Tang, M.D.
Sherman Oaks, CA · $1,149 in drug and device payments (2025) · Telehealth · (818) 616-3998
Dr. Anita Kaul, M.D.
Simi Valley, CA · $2,900 in drug and device payments (2025) · (805) 583-0110
Dr. Monica El-masry, M.D.
Simi Valley, CA · $106 in drug and device payments (2025) · Telehealth · (805) 527-2770
Dr. Sara Capatanos, M.D.
Simi Valley, CA · No drug or device payments recorded (2025) · (818) 999-9999
Dr. Eric Bank, M.D.
Solvang, CA · $43 in drug and device payments (2025) · Telehealth · (805) 686-5370
Dr. Michael Fangman, M.D.
Solvang, CA · $24 in drug and device payments (2025) · (805) 681-1761
Dr. Richard Huynh, M.D.
Solvang, CA · $23 in drug and device payments (2025) · (805) 686-5370
Dr. Yousef Khelfa, M.D
Sonora, CA · No drug or device payments recorded (2025) · Telehealth · (209) 536-3359
Dr. Jennifer Choate, MD
Soquel, CA · No drug or device payments recorded (2025) · (831) 462-8755
Dr. J Pomeroy
Soquel, CA · No drug or device payments recorded (2025) · (831) 462-8750

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.