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. Elizabeth Odumakinde, M.D.
Concord, CA · $434 in drug and device payments (2025) · Telehealth · (925) 674-2100
Dr. Lesley Martin, M.D.
Concord, CA · $1,057 in drug and device payments (2025) · Telehealth · (925) 674-2100
Dr. Sudhathi Chichili, M.D.
Concord, CA · $4,074 in drug and device payments (2025) · Telehealth · (925) 674-2100
Dr. Walailuk Chaiyarat, MD
Concord, CA · $3,730 in drug and device payments (2025) · Telehealth · (925) 674-2100
Dr. Chih-hong Young, M.D.
Corona, CA · $18 in drug and device payments (2025) · (951) 272-0700
Dr. Gregory Gilmore, D.O.
Corona, CA · $331 in drug and device payments (2025) · Telehealth · (951) 898-2828
Dr. Hussein Merza, MD
Corona, CA · $103 in drug and device payments (2025) · Telehealth · (951) 371-2411
Dr. Mohammadbagher Ziari, MD
Corona, CA · $291,444 in drug and device payments (2025) · Telehealth · (951) 898-2828
Dr. Rahul Dev Polineni, M.D
Corona, CA · $139 in drug and device payments (2025) · Telehealth · (951) 898-2828
Dr. Rehana Baqai, M.D.
Corona, CA · $532 in drug and device payments (2025) · Telehealth · (951) 371-2411
Dr. Andreea Nanci, MD
Costa Mesa, CA · $1,683 in drug and device payments (2025) · Telehealth · (949) 999-2400
Dr. Chaitali Nangia, MD
Costa Mesa, CA · $131,219 in drug and device payments (2025) · Telehealth · (949) 288-5701
Dr. Khosrow Mahdavi, MD
Costa Mesa, CA · $33 in drug and device payments (2025) · Telehealth · (949) 999-2400
Dr. Henry Yang, MD
Covina, CA · $34 in drug and device payments (2025) · (626) 331-6411
Dr. Amar Parikh, M.D.
Culver City, CA · $849 in drug and device payments (2025) · Telehealth · (424) 389-0037
Dr. Robert Weber, MD
Daly City, CA · $105,291 in drug and device payments (2025) · (415) 337-2121
Dr. Helmy Guirgis, M.D.
Dana Point, CA · No drug or device payments recorded (2025) · (949) 493-7775
Dr. Eli Richman
Davis, CA · No drug or device payments recorded (2025) · (530) 753-3850
Dr. Francisco Wong, M.D.
Del Mar, CA · No drug or device payments recorded (2025) · (858) 792-6303
Dr. Amitabha Mazumder, M.D.
Downey, CA · $6,517 in drug and device payments (2025) · Telehealth · (562) 869-1201
Dr. Anthony Giorgio, MD
Downey, CA · $17 in drug and device payments (2025) · (562) 869-1201
Dr. Balaganesh Gopurala, MD
Downey, CA · $2,731 in drug and device payments (2025) · (562) 869-1201
Dr. Brian Chun Fang Cheng, M.D.
Downey, CA · $2,519 in drug and device payments (2025) · Telehealth · (562) 904-4480
Dr. Catherine Ly
Downey, CA · No drug or device payments recorded (2025) · (714) 456-5413
Dr. Chaiyaporn Boonchalermvichian, MD
Downey, CA · $157 in drug and device payments (2025) · (562) 869-1201
Dr. Eddie Thara, D.O.
Downey, CA · $5,786 in drug and device payments (2025) · Telehealth · (562) 869-1201
Dr. Haydee Gonzalez Hidalgo, MD
Downey, CA · No drug or device payments recorded (2025) · (562) 869-1201
Dr. Mauro Janoski, MD
Downey, CA · No drug or device payments recorded (2025) · Telehealth · (562) 869-1201
Dr. Nelly Awkar Lazo, M.D
Downey, CA · $2,903 in drug and device payments (2025) · Telehealth · (562) 869-1201
Dr. Ram Muthialu, MD
Downey, CA · No drug or device payments recorded (2025) · (562) 862-5177
Dr. Richy Agajanian, M.D.
Downey, CA · No drug or device payments recorded (2025) · (562) 869-1201
Dr. Soo Chung, M.D.
Downey, CA · No drug or device payments recorded (2025) · (562) 869-1201
Dr. Yunfei Wei, MD
Downey, CA · $3,678 in drug and device payments (2025) · Telehealth · (562) 869-1201
Dr. Alexandra Wong, M.D.
Duarte, CA · $49 in drug and device payments (2025) · Telehealth · (800) 826-4673
Dr. Angela Lopez, M.D.
Duarte, CA · No drug or device payments recorded (2025) · (626) 423-5476
Dr. Mary Cianfrocca, DO
Duarte, CA · $9,888 in drug and device payments (2025) · Telehealth · (626) 256-4673
Dr. Rick Lin
Duarte, CA · $309 in drug and device payments (2025) · (626) 218-7275
Dr. Robert Figlin, MD
Duarte, CA · No drug or device payments recorded (2025) · (626) 359-8111
Dr. Theresa Harned
Duarte, CA · No drug or device payments recorded (2025) · (626) 359-8111
Dr. Vaibhav Agrawal, M.D.
Duarte, CA · $79 in drug and device payments (2025) · Telehealth · (626) 256-4673
Dr. Amanpreet Buttar, MD
Dublin, CA · $246 in drug and device payments (2025) · Telehealth · (925) 875-1677
Dr. Bao Dao, MD
Dublin, CA · $6,114 in drug and device payments (2025) · Telehealth · (925) 875-1677
Dr. Johnny Cai, DO
Dublin, CA · $365 in drug and device payments (2025) · Telehealth · (510) 498-2335
Dr. Shelly Gupta, MD
Dublin, CA · $5,264 in drug and device payments (2025) · Telehealth · (925) 875-1677
Dr. Thomas Callan, M. D.
El Cajon, CA · No drug or device payments recorded (2025) · (619) 440-4421
Dr. Saqib Razzaque, M.D
El Centro, CA · $569 in drug and device payments (2025) · Telehealth · (760) 355-3030
Dr. Syed Ahmed, MD
El Centro, CA · $952 in drug and device payments (2025) · Telehealth · (760) 335-3030
Dr. Padma Narasimhan, M.D.
Elmonte, CA · No drug or device payments recorded (2025) · (626) 579-8308
Dr. Gene Sherman, MD
El Segundo, CA · No drug or device payments recorded (2025) · (310) 568-9595
Dr. Alberto Bessudo, M.D.
Encinitas, CA · $3,924 in drug and device payments (2025) · Telehealth · (760) 452-3340

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.