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Hematology & Oncology in Orange, California

Data updated monthly · Last refresh September 2026

62 Hematology & Oncology providers practice in Orange, and 69% received drug or device company payments in 2025. Listings are drawn from federal public records and are not endorsements.

Hematology & Oncology providers in Orange

Listed alphabetically. 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. Alexander Minella, M.D.
Orange, CA · No drug or device payments recorded (2025) · (800) 465-3203
Dr. Angela Fleischman, MD
Orange, CA · $48,308 in drug and device payments (2025) · Telehealth · (714) 456-8000
Dr. April Choi, MD
Orange, CA · $421 in drug and device payments (2025) · Telehealth · (714) 456-5153
Dr. Arash Rezazadeh Kalebasty, M.D.
Orange, CA · $69,977 in drug and device payments (2025) · Telehealth · (714) 456-8000
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

Conditions Hematology & Oncology providers in Orange, 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 Orange, California?

There are 62 Hematology & Oncology providers with active NPI records practicing in Orange, according to federal NPPES data refreshed monthly.

How many Hematology & Oncology providers in Orange received drug or device company payments?

43 of 62 (69%) 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 Orange treat?

Hematology & Oncology providers in Orange 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 records 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.

All specialties in Orange Hematology & Oncology across California

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.