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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. Ryan Kendle, M.D.
Santa Barbara, CA · $543 in drug and device payments (2025) · Telehealth · (805) 879-0670
Dr. Thomas Woliver, MD
Santa Barbara, CA · No drug or device payments recorded (2025) · (805) 563-5800
Dr. Wayne Kidder, M.D.
Santa Barbara, CA · No drug or device payments recorded (2025) · (805) 967-6993
Dr. Yurhee Lee, M.D.
Santa Barbara, CA · $407 in drug and device payments (2025) · Telehealth · (805) 879-0670
Dr. Jed Katzel, M.D.
Santa Clara, CA · $21 in drug and device payments (2025) · (408) 851-4323
Dr. Jeffrey Bien, M.D.
Santa Clara, CA · No drug or device payments recorded (2025) · Telehealth · (650) 823-9069
Dr. Kevin Shieh, MD, PHD
Santa Clara, CA · No drug or device payments recorded (2025) · Telehealth · (408) 851-4323
Dr. Lucy Song, M.D.
Santa Clara, CA · No drug or device payments recorded (2025) · (408) 851-4323
Dr. Samina Ahmed, MD
Santa Clara, CA · No drug or device payments recorded (2025) · (408) 851-4328
Dr. Shaun Hung, MD
Santa Clara, CA · No drug or device payments recorded (2025) · (408) 851-1000
Dr. Alexander Black, MD
Santa Clarita, CA · $33 in drug and device payments (2025) · Telehealth · (661) 255-5350
Dr. Christopher Foss, MD
Santa Clarita, CA · $289 in drug and device payments (2025) · Telehealth · (661) 839-1801
Dr. George Hajjar, MD
Santa Clarita, CA · $664 in drug and device payments (2025) · Telehealth · (661) 799-1999
Dr. Katherine Cohen, FNP-C
Santa Clarita, CA · $6,524 in drug and device payments (2025) · Telehealth · (661) 255-9287
Dr. Siddharth Kunte, M.D.
Santa Clarita, CA · $6,969 in drug and device payments (2025) · Telehealth · (323) 760-9757
Dr. Thomas Joseph, MD
Santa Clarita, CA · $43 in drug and device payments (2025) · Telehealth · (661) 799-1999
Dr. Vincent Louie Mendiola, M.D.
Santa Clarita, CA · $131 in drug and device payments (2025) · Telehealth · (661) 799-1999
Dr. Amy Mcmullen, M.D.
Santa Cruz, CA · $3,864 in drug and device payments (2025) · Telehealth · (831) 475-2220
Dr. Glenn Wong, DO
Santa Cruz, CA · $339 in drug and device payments (2025) · Telehealth · (831) 460-7355
Dr. Janet Wang
Santa Cruz, CA · $112 in drug and device payments (2025) · Telehealth · (831) 460-7355
Dr. Julie Jaffe, M.D.
Santa Cruz, CA · No drug or device payments recorded (2025) · (831) 427-7110
Dr. Michael Wu, MD
Santa Cruz, CA · No drug or device payments recorded (2025) · (831) 460-7355
Dr. Michael Yen, M.D., PH.D.
Santa Cruz, CA · $2,866 in drug and device payments (2025) · Telehealth · (831) 475-2220
Dr. Rohan Ahluwalia
Santa Cruz, CA · $324 in drug and device payments (2025) · Telehealth · (831) 460-7555
Dr. Steven Lai, MD
Santa Cruz, CA · $655 in drug and device payments (2025) · (831) 460-7355
Dr. Cecil Robertson, M. D.
Santa Maria, CA · $415 in drug and device payments (2025) · Telehealth · (805) 349-9393
Dr. Dustin Stevenson, D.O.
Santa Maria, CA · $382 in drug and device payments (2025) · (805) 349-9393
Dr. Heather Cunningham, MD
Santa Maria, CA · $115 in drug and device payments (2025) · (805) 349-9393
Dr. Kathleen Kennedy, M.D.
Santa Maria, CA · $172 in drug and device payments (2025) · (805) 349-9393
Dr. Keith Ayrons, M.D.
Santa Maria, CA · $152 in drug and device payments (2025) · (805) 349-9393
Dr. Kevin Kim, M.D.
Santa Maria, CA · $126 in drug and device payments (2025) · (805) 349-9393
Dr. Robert Dichmann, MD
Santa Maria, CA · No drug or device payments recorded (2025) · (805) 349-9393
Dr. Wei Bai, MD
Santa Maria, CA · $8,225 in drug and device payments (2025) · Telehealth · (805) 349-9393
Dr. Aaron Lisberg, MD
Santa Monica, CA · $60,129 in drug and device payments (2025) · Telehealth · (310) 826-5471
Dr. Aditya Bardia, MD
Santa Monica, CA · $38,522 in drug and device payments (2025) · Telehealth · (310) 998-4747
Dr. Alexis Levee, MD
Santa Monica, CA · $160 in drug and device payments (2025) · Telehealth · (310) 998-4747
Dr. Angelica Multani, RN, NP
Santa Monica, CA · No drug or device payments recorded (2025) · (424) 259-9427
Dr. Arjan Gower, MD, MS
Santa Monica, CA · $3,054 in drug and device payments (2025) · Telehealth · (310) 829-5471
Dr. Arun Singh, M.D.
Santa Monica, CA · $35,913 in drug and device payments (2025) · Telehealth · (310) 829-5471
Dr. Blanca Ledezma, MSN, NP
Santa Monica, CA · $42,371 in drug and device payments (2025) · (310) 289-5471
Dr. Brian Wolf, MD
Santa Monica, CA · $2,199 in drug and device payments (2025) · Telehealth · (310) 453-5654
Dr. Calvin Klein, MD
Santa Monica, CA · No drug or device payments recorded (2025) · (310) 829-5471
Dr. Caroline Chen
Santa Monica, CA · $46 in drug and device payments (2025) · Telehealth · (310) 826-5471
Dr. Caroline Maxwell, FNP
Santa Monica, CA · $305 in drug and device payments (2025) · (310) 829-5471
Dr. Carol Nishikubo, M.D.
Santa Monica, CA · $250 in drug and device payments (2025) · Telehealth · (310) 453-5654
Dr. Cassandra Blaylock, NP
Santa Monica, CA · No drug or device payments recorded (2025) · (424) 259-9457
Dr. Grace Chang
Santa Monica, CA · $427 in drug and device payments (2025) · Telehealth · (310) 453-5654
Dr. Jasmine Mitchell, MD
Santa Monica, CA · No drug or device payments recorded (2025) · Telehealth · (310) 829-5471
Dr. Jingran Ji
Santa Monica, CA · $29 in drug and device payments (2025) · Telehealth · (310) 829-5471
Dr. Jonathan Goldman, M.D.
Santa Monica, CA · $36,865 in drug and device payments (2025) · Telehealth · (310) 633-8400

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.