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 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. Anna Ter-zakarian, MDSouth Pasadena, CA · $383 in drug and device payments (2025) · Telehealth ·
(858) 554-8779 Dr. Christina Yeon, M.D.South Pasadena, CA · $21 in drug and device payments (2025) · Telehealth ·
(626) 396-2900 Dr. Daniel Kim, M.D.South Pasadena, CA · $42 in drug and device payments (2025) · Telehealth ·
(626) 396-2900 Dr. Kelly Khai Li Yap, M.D.South Pasadena, CA · No drug or device payments recorded (2025) · Telehealth ·
(626) 396-2900 Dr. Margaret Odonnell, MDSouth Pasadena, CA · No drug or device payments recorded (2025) ·
(626) 533-2353 Dr. Samuel Chung, M.D.South Pasadena, CA · $18 in drug and device payments (2025) · Telehealth ·
(626) 396-2900 Dr. Arturo Molina, M.D.South San Francisco, CA · $95 in drug and device payments (2025) ·
(310) 709-4508 Dr. Edmond Schmulbach, MDSouth San Francisco, CA · No drug or device payments recorded (2025) ·
(650) 742-2000 Dr. Jesse Mcgreivy, M.D.South San Francisco, CA · No drug or device payments recorded (2025) ·
(650) 244-2634 Dr. Laurie Weisberg, MDSouth San Francisco, CA · No drug or device payments recorded (2025) ·
(650) 742-2000 Dr. Rafael Gonzalez-amado, MDSouth San Francisco, CA · No drug or device payments recorded (2025) ·
(610) 551-2740 Dr. Supriya Rajpal, MDSouth San Francisco, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 742-2000 Dr. Ami Bhatt, MDStanford, CA · $39 in drug and device payments (2025) ·
(650) 498-4438 Dr. Andres Mendez-hernandez, M.D.Stanford, CA · $685 in drug and device payments (2025) · Telehealth ·
(650) 723-0822 Dr. Ann Mullally, MDStanford, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 723-4000 Dr. Branimir Sikic, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Cheryl Cho-phan, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 498-6000 Dr. Christopher Lemieux, MDStanford, CA · $5,880 in drug and device payments (2025) ·
(650) 723-0837 Dr. Daniel Chen, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Dean Felsher, MDStanford, CA · $3,433 in drug and device payments (2025) ·
(650) 723-4000 Dr. George Fisher, MDStanford, CA · $53 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Gilbert Chu, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Ginna Laport, M.D.Stanford, CA · $116 in drug and device payments (2025) ·
(650) 723-0822 Dr. Hanlee Ji, M.D.Stanford, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 498-6000 Dr. Harold Keer, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. James Mcclellan, M.D., PH.D.Stanford, CA · No drug or device payments recorded (2025) ·
(650) 723-6661 Dr. Jonathan Benjamin, MD, PHDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-0822 Dr. Linda Boxer, M.D.Stanford, CA · No drug or device payments recorded (2025) ·
(650) 735-4036 Dr. Markus Renschler, MDStanford, CA · $744 in drug and device payments (2025) ·
(650) 723-4000 Dr. Mehrdad Mobasher, MD MPHStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-7621 Dr. Patrick Moore, M.D.Stanford, CA · $156 in drug and device payments (2025) ·
(650) 736-1111 Dr. Punita Grover, MBBSStanford, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 723-0837 Dr. Richard Miller, MDStanford, CA · $149 in drug and device payments (2025) ·
(650) 723-4000 Dr. Ruwan Gunaratne, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-4000 Dr. Sandra Horning, M.D.Stanford, CA · $538,174 in drug and device payments (2025) ·
(650) 723-7621 Dr. See-chun Phan, M.D.Stanford, CA · $135 in drug and device payments (2025) ·
(650) 498-5710 Dr. Steven Artandi, M.D.Stanford, CA · No drug or device payments recorded (2025) ·
(650) 736-0975 Dr. Wan-jen Hong, M.D,Stanford, CA · $135 in drug and device payments (2025) ·
(650) 498-6000 Dr. Wendy Pang, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-6661 Dr. Wen-kai Weng, MD, PHDStanford, CA · $19 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Wesley Witteles, MDStanford, CA · No drug or device payments recorded (2025) ·
(650) 723-5007 Dr. William Rogoway, M.D.Stanford, CA · No drug or device payments recorded (2025) ·
(650) 725-6454 Dr. Gregory Smith, M.D.St. Helena, CA · No drug or device payments recorded (2025) ·
(707) 967-5721 Dr. Karen Mercola, MDStinson Beach, CA · No drug or device payments recorded (2025) ·
(415) 868-1358 Dr. Abbas Ghadialy, MDStockton, CA · No drug or device payments recorded (2025) ·
(209) 476-2000 Dr. Aye Soe, M.D.Stockton, CA · No drug or device payments recorded (2025) · Telehealth ·
(209) 476-2000 Dr. Chun Ng, M.D.Stockton, CA · No drug or device payments recorded (2025) · Telehealth ·
(209) 476-5778 Dr. Dheeraj Kodali, M.D.Stockton, CA · $2,237 in drug and device payments (2025) · Telehealth ·
(209) 466-2626 Dr. Ikechukwu ChidobemStockton, CA · No drug or device payments recorded (2025) ·
(209) 550-4795 Dr. James Shum, MDStockton, CA · No drug or device payments recorded (2025) ·
(209) 476-2000 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.
- Breast cancer
- Lung cancer
- Lymphoma
- Leukemia
- Anemia
- Blood disorders
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.
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