HealthcareDiscovery.AI / Doctors / California / Hematology & Oncology

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. Ann Salahuddin
Ventura, CA · No drug or device payments recorded (2025) · (805) 652-6373
Dr. Cassandra Thomas, M.D.
Ventura, CA · $54 in drug and device payments (2025) · Telehealth · (805) 652-6218
Dr. Irena Vidito, D.O.
Ventura, CA · $47 in drug and device payments (2025) · (805) 652-6556
Dr. Isabella Chen, M.D.
Ventura, CA · $71 in drug and device payments (2025) · Telehealth · (805) 652-6218
Dr. Joshua Rosenberg, MD
Ventura, CA · $31 in drug and device payments (2025) · Telehealth · (805) 652-6218
Dr. Lynn Kong, MD
Ventura, CA · $4,531 in drug and device payments (2025) · Telehealth · (805) 485-8709
Dr. Manasi Ghatge, MD
Ventura, CA · $11,132 in drug and device payments (2025) · (805) 642-4830
Dr. Kim Ng, M.D.
Victorville, CA · No drug or device payments recorded (2025) · (760) 388-0071
Dr. Nanda Biswas, M.D.
Victorville, CA · $4,696 in drug and device payments (2025) · Telehealth · (760) 952-0040
Dr. Pallvi Popli, M.D.
Victorville, CA · $2,895 in drug and device payments (2025) · Telehealth · (760) 780-4960
Dr. Vir Nanda, MD
Victorville, CA · $4,744 in drug and device payments (2025) · (760) 780-4960
Dr. Amitoj Gill, MD
Visalia, CA · $434 in drug and device payments (2025) · (559) 624-3100
Dr. David Bryson, M.D.
Visalia, CA · $6,549 in drug and device payments (2025) · (559) 622-0100
Dr. Derek Helton, M.D.
Vista, CA · No drug or device payments recorded (2025) · Telehealth · (760) 598-1700
Dr. Mark Adler
Vista, CA · No drug or device payments recorded (2025) · (760) 598-1700
Dr. Aditi Choudhry, M.D.
Walnut Creek, CA · $109,751 in drug and device payments (2025) · Telehealth · (925) 692-5610
Dr. Alice Kengla, M.D.
Walnut Creek, CA · No drug or device payments recorded (2025) · Telehealth · (925) 295-4575
Dr. Ammara Gill, MD
Walnut Creek, CA · $15 in drug and device payments (2025) · Telehealth · (925) 692-5610
Dr. Aram Canin, MD
Walnut Creek, CA · No drug or device payments recorded (2025) · (925) 295-4000
Dr. Aruna Gavini, MD
Walnut Creek, CA · No drug or device payments recorded (2025) · Telehealth · (925) 939-9610
Dr. Chunnan Liu, MD
Walnut Creek, CA · No drug or device payments recorded (2025) · (925) 295-4000
Dr. Diana Superfin, M.D.
Walnut Creek, CA · $9,827 in drug and device payments (2025) · (925) 939-9610
Dr. Douglas Kaufman, MD
Walnut Creek, CA · No drug or device payments recorded (2025) · (925) 295-4000
Dr. Gauri Sharma, D.O.
Walnut Creek, CA · $2,222 in drug and device payments (2025) · (925) 939-9610
Dr. Jewel Johl, M.D.
Walnut Creek, CA · $50,521 in drug and device payments (2025) · Telehealth · (925) 433-8786
Dr. John Simmons, MD
Walnut Creek, CA · No drug or device payments recorded (2025) · (925) 295-4000
Dr. Jonathan Pai
Walnut Creek, CA · $1,583 in drug and device payments (2025) · Telehealth · (925) 692-5610
Dr. Jose Ochoa-bayona, M.D.
Walnut Creek, CA · $1,296 in drug and device payments (2025) · Telehealth · (925) 677-5041
Dr. Lisbeth Suyehira, MD
Walnut Creek, CA · No drug or device payments recorded (2025) · (925) 944-0290
Dr. Michael Russin, MD
Walnut Creek, CA · No drug or device payments recorded (2025) · Telehealth · (925) 295-4000
Dr. Michael Sherman, M.D., PHD
Walnut Creek, CA · $9,269 in drug and device payments (2025) · (925) 939-9610
Dr. Ronak Patel, M.D.
Walnut Creek, CA · $1,012 in drug and device payments (2025) · Telehealth · (925) 692-5610
Dr. Tanvir Sattar, MD
Walnut Creek, CA · No drug or device payments recorded (2025) · (925) 295-4000
Dr. Tianyi Tang, M.D., PH.D.
Walnut Creek, CA · $3,714 in drug and device payments (2025) · Telehealth · (925) 692-5610
Dr. Tracie Watson, D.O.
Walnut Creek, CA · $1,223 in drug and device payments (2025) · (925) 939-9610
Dr. Tyler Kang, M.D.
Walnut Creek, CA · $4,963 in drug and device payments (2025) · Telehealth · (925) 433-8786
Dr. Yubao Wang, M.D.
Walnut Creek, CA · $1,811 in drug and device payments (2025) · Telehealth · (925) 677-5041
Dr. Zuo Ming Huang, MD
Walnut Creek, CA · No drug or device payments recorded (2025) · (925) 295-4030
Dr. Brian Leberthon, M.D.
West Covina, CA · $6,218 in drug and device payments (2025) · (626) 338-9560
Dr. Cary Presant, M.D.
West Covina, CA · No drug or device payments recorded (2025) · Telehealth · (626) 856-5858
Dr. Lydia Chow, M.D.
West Covina, CA · $1,196 in drug and device payments (2025) · Telehealth · (626) 856-5858
Dr. Michelle El-hajjaoui, DO
West Covina, CA · $39 in drug and device payments (2025) · Telehealth · (626) 732-8390
Dr. Phyllis Klein, M.D.
West Covina, CA · No drug or device payments recorded (2025) · (626) 856-5858
Dr. Subhash Dhand, M.D.
West Covina, CA · No drug or device payments recorded (2025) · (626) 960-7759
Dr. Ashkan Lashkari, MD
West Hills, CA · $5,174 in drug and device payments (2025) · Telehealth · (818) 346-1773
Dr. Bruce Zietz, M.D.
West Hills, CA · No drug or device payments recorded (2025) · (818) 346-1773
Dr. Christopher Ho, M.D.
West Hills, CA · $10,119 in drug and device payments (2025) · Telehealth · (818) 346-1773
Dr. Michael Benjamin, M.D.
West Hills, CA · $2,451 in drug and device payments (2025) · Telehealth · (818) 570-2134
Dr. Omid Shaye, M.D.
West Hills, CA · $1,527 in drug and device payments (2025) · Telehealth · (818) 346-1773
Dr. Andrew Hendifar, MD, MPH
West Hollywood, CA · $55,768 in drug and device payments (2025) · Telehealth · (310) 933-4470

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

Hematology & Oncology in all 50 states Search all 1,582 in the directory Ask Zach for help choosing

Related

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.