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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. Bhavana Pathak, M.D.
Orange, CA · $24 in drug and device payments (2025) · Telehealth · (714) 541-0101
Dr. Brian Warnecke, D.O.
Orange, CA · $648 in drug and device payments (2025) · Telehealth · (714) 456-7772
Dr. Catherine Coombs, M.D.
Orange, CA · $206,075 in drug and device payments (2025) · Telehealth · (714) 456-8100
Dr. Cathleen Park, M.D.
Orange, CA · $6,114 in drug and device payments (2025) · Telehealth · (714) 456-8100
Dr. Chuan-ju Pan, M.D.
Orange, CA · No drug or device payments recorded (2025) · (714) 541-6622
Dr. Deepa Jeyakumar, M.D.
Orange, CA · $1,541 in drug and device payments (2025) · Telehealth · (714) 456-5153
Dr. Edward L Nelson, MD
Orange, CA · No drug or device payments recorded (2025) · Telehealth · (714) 456-8978
Dr. Elizabeth Brem, MD
Orange, CA · $82,802 in drug and device payments (2025) · Telehealth · (714) 456-8000
Dr. Elizabeth Kaufman
Orange, CA · No drug or device payments recorded (2025) · (714) 456-8888
Dr. Emad Elquza, M.D.
Orange, CA · No drug or device payments recorded (2025) · Telehealth · (714) 456-8000
Dr. Erin Dean, M.D.
Orange, CA · $65 in drug and device payments (2025) · (714) 456-8888
Dr. Fa-chyi Lee, M.D.
Orange, CA · No drug or device payments recorded (2025) · Telehealth · (714) 456-8000
Dr. Frank L Meyskens
Orange, CA · No drug or device payments recorded (2025) · (714) 456-8978
Dr. Hoa Le, M.D.
Orange, CA · No drug or device payments recorded (2025) · (714) 456-5153
Dr. Jae C Chang, MD
Orange, CA · No drug or device payments recorded (2025) · (714) 456-8978
Dr. James Padova, M.D.
Orange, CA · No drug or device payments recorded (2025) · (714) 835-1800
Dr. Jason Zell, DO
Orange, CA · No drug or device payments recorded (2025) · Telehealth · (714) 456-8068
Dr. Jeffrey Ahn, M.D.
Orange, CA · $35 in drug and device payments (2025) · Telehealth · (714) 456-8100
Dr. John Link, MD
Orange, CA · $69 in drug and device payments (2025) · Telehealth · (714) 541-0101
Dr. John P Fruehauf, MD
Orange, CA · $19 in drug and device payments (2025) · Telehealth · (714) 456-8978
Dr. John Wong, MD
Orange, CA · $8,223 in drug and device payments (2025) · Telehealth · (562) 725-4367
Dr. Jorge Ramos Perez, MD
Orange, CA · $142 in drug and device payments (2025) · Telehealth · (714) 456-6764
Dr. Julie Smith, NP
Orange, CA · $778 in drug and device payments (2025) · (714) 456-8000
Dr. Kamyar Nader, M.D.
Orange, CA · $91 in drug and device payments (2025) · Telehealth · (714) 456-8888
Dr. Kiran Naqvi, M.D.
Orange, CA · $6,771 in drug and device payments (2025) · Telehealth · (832) 909-5763
Dr. Madhavi Mummaneni, MD
Orange, CA · $6,546 in drug and device payments (2025) · Telehealth · (714) 628-3136
Dr. May Cho, M.D
Orange, CA · $348 in drug and device payments (2025) · Telehealth · (714) 880-7812
Dr. Miguel Villalona Calero, M.D.
Orange, CA · $121 in drug and device payments (2025) · Telehealth · (714) 456-8102
Dr. Mihaela Cristea, MD
Orange, CA · No drug or device payments recorded (2025) · (714) 456-8888
Dr. Misako Nagasaka, MD
Orange, CA · $106,175 in drug and device payments (2025) · Telehealth · (714) 456-8000
Dr. Nataliya Mar, MD
Orange, CA · $48,958 in drug and device payments (2025) · Telehealth · (714) 456-8000
Dr. Nellie Nafissi, M.D.
Orange, CA · No drug or device payments recorded (2025) · Telehealth · (714) 456-7890
Dr. Nicole Foley, M.D.
Orange, CA · $130 in drug and device payments (2025) · Telehealth · (714) 456-5153
Dr. Nishant Munugala, MD, MPH
Orange, CA · $35 in drug and device payments (2025) · Telehealth · (714) 456-5153
Dr. Omid Yazdanpanah, MD
Orange, CA · $2,173 in drug and device payments (2025) · Telehealth · (714) 456-8000
Dr. Paul Coluzzi, M.D.
Orange, CA · No drug or device payments recorded (2025) · (714) 456-2986
Dr. Piyanuch Kongtim, MD, PHD.
Orange, CA · No drug or device payments recorded (2025) · Telehealth · (714) 880-7812
Dr. Polina Bellman, MD
Orange, CA · $142 in drug and device payments (2025) · Telehealth · (714) 456-5153
Dr. Poorva Vaidya
Orange, CA · $2,426 in drug and device payments (2025) · Telehealth · (714) 456-8000
Dr. Rita Sanghvi Mehta, MD
Orange, CA · No drug or device payments recorded (2025) · Telehealth · (714) 456-8978
Dr. Ritesh Parajuli, MD
Orange, CA · $21,563 in drug and device payments (2025) · Telehealth · (714) 456-8000
Dr. Sai-hong I Ou, MD
Orange, CA · $1,170 in drug and device payments (2025) · (714) 456-8978
Dr. Sam Huang, M.D.
Orange, CA · $8,232 in drug and device payments (2025) · Telehealth · (714) 541-6622
Dr. Sami Dwabe
Orange, CA · $401 in drug and device payments (2025) · Telehealth · (714) 456-8000
Dr. Sandy Liu, M.D.
Orange, CA · $64,988 in drug and device payments (2025) · Telehealth · (714) 456-8888
Dr. Shannon Zhang, MD
Orange, CA · $186 in drug and device payments (2025) · (714) 456-5691
Dr. Shirin Attarian, M.D.
Orange, CA · $145 in drug and device payments (2025) · Telehealth · (714) 456-8000
Dr. Stavroula Otis, M.D.
Orange, CA · $2,367 in drug and device payments (2025) · Telehealth · (714) 835-4800
Dr. Stefan Ciurea, MD
Orange, CA · $9,085 in drug and device payments (2025) · Telehealth · (714) 880-7812
Dr. Steven Lipkin, MD
Orange, CA · No drug or device payments recorded (2025) · Telehealth · (714) 456-8068

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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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.