Blood Banking & Transfusion Medicine Doctors in California
Data updated monthly · Last refresh October 2026
55 Blood Banking & Transfusion Medicine providers practice in California. 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.
55providers
Los Angelestop city
Blood Banking & Transfusion Medicine by city in California
Choose a city to see providers there.
Where Blood Banking & Transfusion Medicine Doctors in California practice
From CMS Medicare enrollment records covering 22 of the 55 providers listed here (40%). Providers who do not bill Medicare are not included in these figures.
9%solo or small practice (under 10 clinicians)
14%mid-size group (10 to 99)
77%large group or health system (100+)
Largest practice groups
| Group (as registered with Medicare) | Blood Banking & Transfusion Medicine Doctors | All clinicians in group | Main city |
| Regents of the Univ of Ca | 5 | 1,571 | Sacramento |
| City of Hope Medical Foundation | 3 | 964 | Duarte |
| Regents of the University of California | 3 | 40 | Orange |
| Regents of the University of California | 2 | 2,047 | San Diego |
| University of California San Francisco | 2 | 1,780 | San Francisco |
Hospitals where they hold privileges
| Hospital | City | Ownership | CMS star rating | Blood Banking & Transfusion Medicine Doctors affiliated |
| University of California Davis Medical Center | Sacramento | Government | 4 of 5 | 5 |
| Uci Health-Orange | Orange | Government | 4 of 5 | 3 |
| UC San Diego Health Hillcrest - Hillcrest Med Ctr | San Diego | Nonprofit | 5 of 5 | 2 |
| UCSF Medical Center | San Francisco | Nonprofit | 4 of 5 | 2 |
| Keck Hospital of Usc | Los Angeles | Nonprofit | 5 of 5 | 2 |
Sources: CMS Doctors and Clinicians (August 2026) and Facility Affiliation files (August 2026); hospital ownership type and overall star rating from CMS Hospital General Information (July 2026). A clinician in several groups is counted once, in the largest group they bill through. Ownership type is what the hospital reports to CMS; it does not show private equity or other investor ownership. How we build this directory.
Blood Banking & Transfusion Medicine 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. Gary Gochman, MDBellflower, CA · No drug or device payments recorded (2025) ·
(562) 461-3000 Dr. Ahmad Al-sabbagh, MDCarlsbad, CA · $63 in drug and device payments (2025) ·
(760) 431-6154 Dr. Roger Williams, MDCarmel By The Sea, CA · No drug or device payments recorded (2025) ·
(831) 622-0991 Dr. Joy Fridey, MDDuarte, CA · No drug or device payments recorded (2025) ·
(626) 359-8111 Dr. Shan Yuan, MDDuarte, CA · No drug or device payments recorded (2025) ·
(626) 359-8111 Dr. Yongyi Han, MDDuarte, CA · No drug or device payments recorded (2025) ·
(626) 256-4673 Dr. Patrick Sadler, M.D.Fresno, CA · No drug or device payments recorded (2025) ·
(559) 389-5403 Dr. Willard Worthen, M.D.Inglewood, CA · No drug or device payments recorded (2025) ·
(310) 680-8391 Dr. Jennifer Woo, MDIrvine, CA · No drug or device payments recorded (2025) ·
(949) 671-4673 Dr. Yung-kang Chow, M.D., A.M.Irvine, CA · No drug or device payments recorded (2025) ·
(818) 667-9860 Dr. Wesley Stevens, M.D.Loma Linda, CA · No drug or device payments recorded (2025) ·
(909) 558-2304 Dr. Dana Yee, M.D.Long Beach, CA · No drug or device payments recorded (2025) ·
(714) 276-4150 Dr. Chelsea Halprin, DOLos Angeles, CA · No drug or device payments recorded (2025) ·
(323) 442-2582 Dr. Cindy Tay, MDLos Angeles, CA · No drug or device payments recorded (2025) ·
(310) 825-3766 Dr. Huy Pham, M.D.Los Angeles, CA · $36,524 in drug and device payments (2025) ·
(323) 442-9867 Dr. Joseph Thompson Jr., MDLos Angeles, CA · No drug or device payments recorded (2025) ·
(323) 783-4011 Dr. Judith Pachciarz, M.D.Los Angeles, CA · No drug or device payments recorded (2025) ·
(909) 919-9296 Dr. Melanie Osby, M.D.Los Angeles, CA · $23 in drug and device payments (2025) ·
(323) 409-5964 Dr. Michael Kanter, MDLos Angeles, CA · No drug or device payments recorded (2025) ·
(323) 783-4011 Dr. Shelley Chang, MDLos Angeles, CA · No drug or device payments recorded (2025) ·
(323) 442-2582 Dr. Yao Ma, M.D.Los Angeles, CA · $18 in drug and device payments (2025) ·
(323) 409-7159 Dr. Yembur Ahmad, MDLos Angeles, CA · $34 in drug and device payments (2025) ·
(323) 660-2450 Dr. Christopher Gresens, MDMather, CA · No drug or device payments recorded (2025) ·
(916) 453-3728 Dr. Andrew Jones, MDOakland, CA · $190 in drug and device payments (2025) ·
(510) 428-3019 Dr. Catherine Mazzei, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 594-5265 Dr. Gagan Mathur, MD, MBA Dr. Edgar Engleman, M.DPalo Alto, CA · No drug or device payments recorded (2025) ·
(650) 723-7960 Dr. Kamran Urgun, M.D.Palo Alto, CA · No drug or device payments recorded (2025) ·
(877) 717-3733 Dr. Yaseen Jamal, MD, PHDPalo Alto, CA · No drug or device payments recorded (2025) ·
(650) 723-5948 Dr. Rachel Rangwala, M.D.Palos Verdes Estates, CA · No drug or device payments recorded (2025) ·
(404) 483-1155 Dr. Joseph Cho, MD, PHDPasadena, CA · No drug or device payments recorded (2025) ·
(626) 352-1444 Dr. David Unold, M.D.Sacramento, CA · No drug or device payments recorded (2025) ·
(916) 734-9200 Dr. Furkan Yigitbilek, MDSacramento, CA · No drug or device payments recorded (2025) ·
(916) 734-7373 Dr. Grace Monis, MD, PHDSacramento, CA · $141 in drug and device payments (2025) ·
(916) 734-7347 Dr. Sarah Barnhard, MDSacramento, CA · No drug or device payments recorded (2025) ·
(916) 734-2525 Dr. Wesley Rubenstein, DOSacramento, CA · No drug or device payments recorded (2025) ·
(916) 734-2339 Dr. Elizabeth Allen, M.D.San Diego, CA · No drug or device payments recorded (2025) ·
(619) 453-7669 Dr. Karine Hollis-perry, M.D.San Diego, CA · No drug or device payments recorded (2025) ·
(619) 532-7937 Dr. Michael Bonin, MDSan Diego, CA · No drug or device payments recorded (2025) ·
(619) 528-5000 Dr. Patricia Kopko, M.D.San Diego, CA · No drug or device payments recorded (2025) ·
(619) 543-7669 Dr. Ashok Nambiar, MDSan Francisco, CA · No drug or device payments recorded (2025) ·
(415) 353-1311 Dr. Eberhard Fiebig, MDSan Francisco, CA · No drug or device payments recorded (2025) ·
(415) 206-6068 Dr. Jonathan Esensten, M.D., PH.D.San Francisco, CA · No drug or device payments recorded (2025) ·
(415) 353-7359 Dr. Kim-anh Nguyen, MD, PHDSan Francisco, CA · $22 in drug and device payments (2025) ·
(415) 749-6647 Dr. Mohamed Bikhet, MBBCHSan Francisco, CA · No drug or device payments recorded (2025) ·
(415) 353-1667 Dr. Nora Hirschler, MDSan Francisco, CA · No drug or device payments recorded (2025) ·
(415) 749-6663 Dr. Omar KhanSan Francisco, CA · No drug or device payments recorded (2025) ·
(415) 353-7359 Common questions
How many Blood Banking & Transfusion Medicine providers are in California?There are 55 Blood Banking & Transfusion Medicine providers with active NPI records practicing in California, according to federal NPPES data refreshed monthly.
Which cities in California have the most Blood Banking & Transfusion Medicine providers?Los Angeles (10), San Francisco (7), Sacramento (5) have the highest concentration of Blood Banking & Transfusion Medicine providers in California.
How many Blood Banking & Transfusion Medicine providers in California received drug or device company payments?13 of 55 Blood Banking & Transfusion Medicine providers in California (24%) received at least one payment from a drug or device company in 2025, according to the federal Open Payments program.
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 Blood Banking & Transfusion Medicine Doctors in California work in independent practices or large health systems?Among 22 Blood Banking & Transfusion Medicine Doctors in California enrolled in Medicare, 9% bill through a solo or small practice with fewer than 10 clinicians, 14% 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 Blood Banking & Transfusion Medicine Doctors in California work at?According to CMS facility affiliation records, the California hospitals where the most Blood Banking & Transfusion Medicine Doctors hold privileges are University of California Davis Medical Center in Sacramento; Uci Health-Orange in Orange; UC San Diego Health Hillcrest - Hillcrest Med Ctr in San Diego.
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