Medical Oncology in California
676 licensed medical oncologists practicing in California across 162 cities.
This page republishes public records from the federal NPI Registry, which every licensed U.S. healthcare provider is required to maintain. These are federal-agency records, not a directory we compile.
Source: NPI Registry · last checked
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Click a city to filter the 50 providers shown below. California has providers in 162 cities total — search the full NPI Registry for cities not shown here.
NPI Registry records — Medical Oncology in California
36 of 50 shown have disclosed payments in CMS Open Payments (2024)
Showing 50 of 676 federal NPI records, alphabetical by last name. Contact details come directly from the NPI Registry — verify currency with the provider's office. Pharma / device payment disclosures from CMS Open Payments are shown where the physician appears in that federal database.
Alireza Abdolmohammadi, MD
209 Martin Luther King Jr Way
Tacoma, WA 98405 · (253) 596-3300
License: MD61527860 (WA)
In 2023, $200 was disclosed to this physician across 4 transactions by pharmaceutical or medical-device companies.
Mostly entertainment ($119) and gifts ($82).
Haifaa Abdulhaq, MD
785 Medical Center Drive West, 203
Fresno, CA 93611 · (559) 387-1900
License: A111931 (CA)
In 2024, $80,418 was disclosed to this physician across 169 transactions by pharmaceutical or medical-device companies.
$8,371 was research funding (clinical-trial work); the remainder was charitable contributions ($33,283) and meals and beverages ($20,087).
Largest single payer: F. Hoffmann-La Roche AG ($28,168).
Nihal Essa Abdulla, MD
3822 Katella Ave Ste 200
Los Alamitos, CA 90720 · (562) 735-0602
License: A120904 (CA)
In 2024, $9,911 was disclosed to this physician across 275 transactions by pharmaceutical or medical-device companies.
Mostly entertainment ($6,231) and charitable contributions ($3,488).
Largest single payer: AstraZeneca Pharmaceuticals LP ($3,736).
Donald Ira Abrams, MD
1701 Divisadero St
San Francisco, CA 94143 · (415) 353-7720
License: G36948 (CA)
In 2024, $23,713 was disclosed to this physician across 8 transactions by pharmaceutical or medical-device companies.
$3,603 was research funding (clinical-trial work); the remainder was charitable contributions ($12,933) and meals and beverages ($6,789).
Largest single payer: F. Hoffmann-La Roche AG ($16,189).
Kambiz Afrasiabi, MD
2571 W La Palma Ave, Ste 407
Anaheim, CA 92801 · (714) 827-9797
License: A48498 (CA)
In 2024, $48 was disclosed to this physician across 2 transactions by pharmaceutical or medical-device companies.
Mostly entertainment ($48).
Largest single payer: Daiichi Sankyo Inc. ($29).
In 2024, $67,677 was disclosed to this physician across 78 transactions by pharmaceutical or medical-device companies.
Mostly charitable contributions ($35,703) and consulting fees ($14,728).
Largest single payer: Deciphera Pharmaceuticals Inc. ($31,036).
Naseer Ahmad, MD
11850 Blackfoot St Nw Ste 200
Coon Rapids, MN 55433 · (612) 341-4800
License: A51228 (CA)
In 2024, $27 was disclosed to this physician across 1 transaction by pharmaceutical or medical-device companies.
Mostly entertainment ($27).
Largest single payer: GlaxoSmithKline, LLC. ($27).
Sang Hoon Ahn, MD
1950 Sunny Crest Dr Ste 2800
Fullerton, CA 92835 · (657) 888-9919
License: A95562 (CA)
In 2024, $48 was disclosed to this physician across 3 transactions by pharmaceutical or medical-device companies.
Mostly gifts ($35) and entertainment ($14).
Largest single payer: Merck Sharp & Dohme LLC ($18).
In 2024, $7,858 was disclosed to this physician across 10 transactions by pharmaceutical or medical-device companies.
Mostly charitable contributions ($6,148) and meals and beverages ($1,386).
Largest single payer: Acrotech Biopharma Inc. ($4,654).
Shafqat M. Akhtar, MD
2340 Liberty Pkwy Ste 200
Red Bluff, CA 96080 · (530) 529-6010
License: A45081 (CA)
Luai Samir Al Rabadi, MD
1825 4th Street, Fouth Floor
San Francisco, CA 94158 · (415) 353-9888
License: A133367 (CA)
Muhammad Mansoor Alam, MD
7065 N. Maple Ave, Ste 102
Fresno, CA 93720 · (559) 554-2100
License: 5135086241 (OH)
In 2024, $5,067 was disclosed to this physician across 183 transactions by pharmaceutical or medical-device companies.
Mostly entertainment ($3,909) and charitable contributions ($525).
Largest single payer: AstraZeneca Pharmaceuticals LP ($861).
Michael Alexander, MD
1669 Dominican Way
Santa Cruz, CA 95065 · (831) 475-2220
License: G267240 (CA)
In 2024, $23 was disclosed to this physician across 1 transaction by pharmaceutical or medical-device companies.
Mostly entertainment ($23).
Largest single payer: BeiGene USA, Inc. ($23).
In 2024, $980 was disclosed to this physician across 40 transactions by pharmaceutical or medical-device companies.
Mostly entertainment ($980).
Largest single payer: Pfizer Inc. ($171).
In 2023, $4,200 was disclosed to this physician across 1 transaction by pharmaceutical or medical-device companies.
Mostly charitable contributions ($4,200).
Ian Churchill Anderson, MD
3555 Round Barn Cir
Santa Rosa, CA 95403 · (707) 528-1050
License: A49481 (CA)
In 2024, $604 was disclosed to this physician across 22 transactions by pharmaceutical or medical-device companies.
Mostly entertainment ($604).
Largest single payer: Pfizer Inc. ($85).
Laurie Anderson, PAC
800 1/2 Prospect Blvd
Pasadena, CA 91103 · (626) 441-6098
License: PA13069 (CA)
Danielle Francoise Atibalentja, MD, PHD
600 Highland Ave
Madison, WI 53792 · (608) 915-0100
License: 86720-20 (WI)
Chloe Atreya, MD, PHD
1600 Divisadero St, 4th Floor, Box 1705
San Francisco, CA 94115 · (415) 353-9888
License: A104445 (CA)
In 2024, $2,899 was disclosed to this physician across 3 transactions by pharmaceutical or medical-device companies.
Mostly charitable contributions ($2,625) and entertainment ($274).
Largest single payer: F. Hoffmann-La Roche AG ($2,625).
In 2024, $270 was disclosed to this physician across 2 transactions by pharmaceutical or medical-device companies.
Mostly entertainment ($270).
Largest single payer: Janssen Biotech, Inc. ($145).
In 2024, $564 was disclosed to this physician across 7 transactions by pharmaceutical or medical-device companies.
Mostly entertainment ($564).
Largest single payer: Tempus AI, Inc ($310).
Nikita Vashi Baclig, MD
2020 Santa Monica Blvd Ste 580
Santa Monica, CA 90404 · (310) 829-5471
License: A168697 (CA)
In 2024, $1,675 was disclosed to this physician across 3 transactions by pharmaceutical or medical-device companies.
Mostly stock or ownership interest ($1,396) and entertainment ($279).
Largest single payer: Pfizer Inc. ($1,560).
Bahareh Bahadini, MD
425 Haaland Dr Ste 101
Thousand Oaks, CA 91361 · (805) 496-2949
License: A64997 (CA)
In 2024, $88 was disclosed to this physician across 1 transaction by pharmaceutical or medical-device companies.
Mostly gifts ($88).
Largest single payer: Pfizer Inc. ($88).
In 2024, $16,945 was disclosed to this physician across 17 transactions by pharmaceutical or medical-device companies.
Mostly consulting fees ($15,400) and meals and beverages ($943).
Largest single payer: Kite Pharma, Inc. ($16,684).
Pushpendu Banerjee, MD
9850 Genesee Ave Ste 560
La Jolla, CA 92037 · (858) 552-1410
License: A69490 (CA)
In 2024, $2,238 was disclosed to this physician across 78 transactions by pharmaceutical or medical-device companies.
Mostly entertainment ($2,032) and gifts ($207).
Largest single payer: Alexion Pharmaceuticals, Inc. ($335).
Aditya Bardia, MD
2336 Santa Monica Blvd Ste 304
Santa Monica, CA 90404 · (310) 998-4747
License: C195724 (CA)
In 2024, $112,428 was disclosed to this physician across 55 transactions by pharmaceutical or medical-device companies.
$15,727 was research funding (clinical-trial work); the remainder was charitable contributions ($77,859) and meals and beverages ($15,647).
Largest single payer: Gilead Sciences, Inc. ($46,401).
Afsaneh Barzi, MD
1441 Eastlake Ave, Nor 8302e
Los Angeles, CA 90033 · (323) 865-3105
License: A117268 (CA)
In 2024, $19,068 was disclosed to this physician across 16 transactions by pharmaceutical or medical-device companies.
Mostly charitable contributions ($18,683) and entertainment ($304).
Largest single payer: Bayer HealthCare Pharmaceuticals Inc. ($10,150).
Reva Kakkar Basho, MD
8700 Beverly Blvd
West Hollywood, CA 90048 · (310) 967-2700
License: A119414 (CA)
In 2024, $16,269 was disclosed to this physician across 16 transactions by pharmaceutical or medical-device companies.
$1,162 was research funding (clinical-trial work); the remainder was charitable contributions ($13,885) and entertainment ($743).
Largest single payer: Genentech USA, Inc. ($7,580).
Pamela Basto, MD, PHD
875 Blake Wilbur Dr
Palo Alto, CA 94304 · (650) 498-6000
License: A175103 (CA)
In 2024, $274 was disclosed to this physician across 2 transactions by pharmaceutical or medical-device companies.
Mostly entertainment ($274).
Largest single payer: ARRAY BIOPHARMA INC ($139).
In 2024, $431 was disclosed to this physician across 4 transactions by pharmaceutical or medical-device companies.
Mostly entertainment ($431).
Largest single payer: Gilead Sciences, Inc. ($268).
Abinav Baweja, MD
5555 W Las Positas Blvd
Pleasanton, CA 94588 · (925) 416-5470
License: A154829 (CA)
In 2024, $25 was disclosed to this physician across 1 transaction by pharmaceutical or medical-device companies.
Mostly entertainment ($25).
Largest single payer: NOVARTIS PHARMACEUTICALS CORPORATION ($25).
In 2024, $16,268 was disclosed to this physician across 33 transactions by pharmaceutical or medical-device companies.
Mostly charitable contributions ($13,220) and meals and beverages ($2,473).
Largest single payer: Janssen Biotech, Inc. ($8,272).
In 2024, $2,799 was disclosed to this physician across 108 transactions by pharmaceutical or medical-device companies.
Mostly entertainment ($2,466) and category 18 ($333).
Largest single payer: NOVARTIS PHARMACEUTICALS CORPORATION ($773).
Mark Christopher Benyunes, MD
1 Dna Way, Mailstop 444b
South San Francisco, CA 94080 · (650) 225-1628
License: MD00026459 (WA)
Christopher C. Benz, MD
1600 Divisadero St
San Francisco, CA 94115 · (415) 353-7070
License: G25446 (CA)
Emily K. Bergsland, MD
1600 Divisadero St
San Francisco, CA 94115 · (415) 353-9888
License: G70524 (CA)
In 2024, $183 was disclosed to this physician across 1 transaction by pharmaceutical or medical-device companies.
Mostly consulting fees ($183).
Largest single payer: Boehringer Ingelheim Pharmaceuticals, Inc. ($183).
In 2024, $122 was disclosed to this physician across 2 transactions by pharmaceutical or medical-device companies.
Mostly entertainment ($122).
Largest single payer: NOVARTIS PHARMACEUTICALS CORPORATION ($89).
Jonathan Laurence Berkowitz, MD, PHD
2401 W University Ave
Muncie, IN 47303 · (765) 281-2030
License: 01081263A (IN)
In 2024, $25 was disclosed to this physician across 1 transaction by pharmaceutical or medical-device companies.
Mostly entertainment ($25).
Largest single payer: Janssen Scientific Affairs, LLC ($25).
In 2024, $106 was disclosed to this physician across 1 transaction by pharmaceutical or medical-device companies.
Mostly entertainment ($106).
Largest single payer: Kyowa Kirin, Inc. ($106).
In 2024, $102 was disclosed to this physician across 4 transactions by pharmaceutical or medical-device companies.
Mostly entertainment ($102).
Largest single payer: ViiV Healthcare Company ($71).
In 2024, $15,203 was disclosed to this physician across 9 transactions by pharmaceutical or medical-device companies.
$660 was research funding (clinical-trial work); the remainder was charitable contributions ($13,280) and meals and beverages ($919).
Largest single payer: Genzyme Corporation ($12,543).
In 2024, $19,588 was disclosed to this physician across 27 transactions by pharmaceutical or medical-device companies.
Mostly charitable contributions ($10,665) and consulting fees ($6,075).
Largest single payer: ARRAY BIOPHARMA INC ($7,261).
Showing 50 of 676. Search all on NPI Registry →
Payment totals shown for the latest published program year (2024). Presence of disclosed payments is not, on its own, a conflict of interest. Physicians dispute records directly with CMS (dispute process). How we show this.
Open Payments figures as displayed on . Corrections flow from the manufacturer through CMS and are adopted on our next refresh.
What this page is: a republication of public federal NPI Registry records, filtered to the medical oncology taxonomy. It is not a directory we curate, and inclusion is automatic based on each provider's own NPI filing with CMS. Providers who believe their NPI record is inaccurate should update it directly with CMS at npiregistry.cms.hhs.gov; our next refresh adopts the corrected federal record.
Practice info disclaimer: Provider addresses and phone numbers come from the NPI Registry, which providers update at their discretion. Always call ahead to confirm the provider is currently accepting patients and is at the listed address.
Medical disclaimer: This page is not a quality ranking and does not constitute medical advice or endorsement. Choose a provider in consultation with your primary care physician or care team.
Source: NPI Registry (taxonomy: Medical Oncology) · Last checked: 2026-04-20