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. 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, MDOrange, CA · $9,085 in drug and device payments (2025) · Telehealth ·
(714) 880-7812 Dr. Steven Lipkin, MDOrange, CA · No drug or device payments recorded (2025) · Telehealth ·
(714) 456-8068 Dr. Tariq Mahmood, M.D.Orange, CA · $5,321 in drug and device payments (2025) · Telehealth ·
(714) 541-6622 Dr. Tiberio Lindgren, MDOrange, CA · No drug or device payments recorded (2025) ·
(714) 835-1800 Dr. Timothy Byun, MDOrange, CA · $5,583 in drug and device payments (2025) · Telehealth ·
(714) 835-1800 Dr. Tiong S Ong, MDOrange, CA · No drug or device payments recorded (2025) ·
(714) 456-8978 Dr. Warren Chow, MDOrange, CA · $531 in drug and device payments (2025) · Telehealth ·
(714) 456-5153 Dr. Xinyu Nan, M.D.Orange, CA · $8,451 in drug and device payments (2025) · Telehealth ·
(714) 541-6622 Dr. Zahra Sadat Hamedi, MDOrange, CA · $308 in drug and device payments (2025) · Telehealth ·
(714) 456-7890 Dr. Zhaohui Arter, MDOrange, CA · $15,603 in drug and device payments (2025) · Telehealth ·
(714) 456-5670 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.
- Breast cancer
- Lung cancer
- Lymphoma
- Leukemia
- Anemia
- Blood disorders
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
