Clinical Pathologists (Laboratory Medicine) in California
Data updated monthly · Last refresh October 2026
131 Clinical Pathology/Laboratory Medicine providers practice in California. The largest concentration is in San Francisco. 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.
131providers
San Franciscotop city
Clinical Pathology/Laboratory Medicine by city in California
Choose a city to see providers there.
Where Clinical Pathologists (Laboratory Medicine) in California practice
From CMS Medicare enrollment records covering 42 of the 131 providers listed here (32%). Providers who do not bill Medicare are not included in these figures.
Largest practice groups
| Group (as registered with Medicare) | Clinical Pathologists (Laboratory Medicine) | All clinicians in group | Main city |
| Regents of the University of California | 8 | 2,047 | San Diego |
| University of California San Francisco | 6 | 1,780 | San Francisco |
| Cedars-Sinai Medical Care Foundation | 4 | 1,684 | West Hollywood |
| Permanente Medical Group Inc. | 3 | 10,928 | Stockton |
| UCLA Pathology and Laboratory Medicine Group | 3 | 68 | Los Angeles |
Hospitals where they hold privileges
| Hospital | City | Ownership | CMS star rating | Clinical Pathologists (Laboratory Medicine) affiliated |
| UC San Diego Health Hillcrest - Hillcrest Med Ctr | San Diego | Nonprofit | 5 of 5 | 8 |
| UCSF Medical Center | San Francisco | Nonprofit | 4 of 5 | 6 |
| Cedars-Sinai Medical Center | Los Angeles | Nonprofit | 5 of 5 | 4 |
| California Pacific Medical Ctr-Davies Campus Hosp | San Francisco | Nonprofit | 3 of 5 | 3 |
| California Pacific Medical Center- Van Ness Campus | San Francisco | Nonprofit | 3 of 5 | 3 |
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.
Clinical Pathology/Laboratory 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. Arthur Baca, M.D., PH.D.Alameda, CA · No drug or device payments recorded (2025) ·
(510) 263-4094 Dr. Dennis O'malley, M.D.Aliso Viejo, CA · No drug or device payments recorded (2025) ·
(949) 425-5832 Dr. Thomas Bruice, M.D., PH.D.Carlsbad, CA · No drug or device payments recorded (2025) ·
(760) 438-4018 Dr. Sean Owens, DVMDavis, CA · No drug or device payments recorded (2025) ·
(530) 400-6012 Dr. William Paxton, M.D.Encinits, CA · No drug or device payments recorded (2025) ·
(760) 479-0664 Dr. Jacob Jorgensen, M.D.Folsom, CA · No drug or device payments recorded (2025) ·
(916) 804-1155 Dr. Jose Lagera, MDFresno, CA · No drug or device payments recorded (2025) ·
(559) 448-4500 Dr. Marie-rose Akin, MDFresno, CA · No drug or device payments recorded (2025) ·
(559) 449-5360 Dr. Preston Simpson, MDFresno, CA · No drug or device payments recorded (2025) ·
(559) 449-5360 Dr. Tzen Kuang Chen, MDFresno, CA · No drug or device payments recorded (2025) ·
(559) 449-5360 Dr. Wei Fang, MDFresno, CA · No drug or device payments recorded (2025) ·
(559) 449-5360 Dr. Gerald Morris, M.D. / PH.D.La Jolla, CA · $3,149 in drug and device payments (2025) ·
(858) 822-3490 Dr. Helen Broome, M.D.La Jolla, CA · No drug or device payments recorded (2025) ·
(858) 822-6279 Dr. Jack Bui, M.D., PH.D.La Jolla, CA · $125 in drug and device payments (2025) ·
(858) 534-3890 Dr. Ryan Austin, M.D.La Jolla, CA · No drug or device payments recorded (2025) ·
(858) 554-8605 Dr. James Pappas, M.D.Loma Linda, CA · No drug or device payments recorded (2025) ·
(909) 558-2304 Dr. Kerby Oberg, M.D.Loma Linda, CA · No drug or device payments recorded (2025) ·
(909) 558-6422 Dr. Alan Hiti, MD, PHDLos Angeles, CA · No drug or device payments recorded (2025) ·
(323) 442-2920 Dr. Alyssa Ziman, MDLos Angeles, CA · $1,206 in drug and device payments (2025) ·
(310) 794-7953 Dr. Briana Fitch, PHDLos Angeles, CA · No drug or device payments recorded (2025) ·
(323) 442-2582 Dr. David Kon, M.D.Los Angeles, CA · $100 in drug and device payments (2025) ·
(323) 268-5000 Dr. Dawn Ward, M.D.Los Angeles, CA · No drug or device payments recorded (2025) ·
(310) 267-8152 Dr. Elaine ReedLos Angeles, CA · No drug or device payments recorded (2025) ·
(310) 794-4943 Dr. Hadassa AlexanderLos Angeles, CA · No drug or device payments recorded (2025) ·
(310) 478-3711 Dr. Jane Emerson, MDLos Angeles, CA · No drug or device payments recorded (2025) ·
(323) 442-2582 Dr. Kingshuk Das, M.D.Los Angeles, CA · No drug or device payments recorded (2025) ·
(310) 794-2766 Dr. Matthew LeongLos Angeles, CA · No drug or device payments recorded (2025) ·
(310) 248-6241 Dr. Michael Selsted, MDLos Angeles, CA · No drug or device payments recorded (2025) ·
(323) 442-2582 Dr. Noriyuki Kasahara, MD, PHDLos Angeles, CA · No drug or device payments recorded (2025) ·
(213) 387-4199 Dr. Raul Simental-pizarro, M.D.Los Angeles, CA · No drug or device payments recorded (2025) ·
(323) 442-9611 Dr. Sepehr Hamidi, M.D.Los Angeles, CA · No drug or device payments recorded (2025) ·
(310) 267-3561 Dr. Shohei Ikoma, M.D.Los Angeles, CA · No drug or device payments recorded (2025) ·
(323) 442-2582 Dr. Sukantha Chandrasekaran, PHD, D(ABMM)Los Angeles, CA · No drug or device payments recorded (2025) ·
(310) 794-2722 Dr. William MartinLos Angeles, CA · No drug or device payments recorded (2025) ·
(626) 799-1700 Dr. Yi Xie, M.D.Los Angeles, CA · No drug or device payments recorded (2025) ·
(323) 409-7148 Dr. Craig Mermel, MD, PHDLos Gatos, CA · No drug or device payments recorded (2025) ·
(224) 522-0920 Dr. Glen StewartMartinez, CA · No drug or device payments recorded (2025) ·
(925) 370-5110 Dr. Gloria AsuncionMartinez, CA · No drug or device payments recorded (2025) ·
(925) 370-5110 Dr. Hye Kyung Kim, MDMartinez, CA · No drug or device payments recorded (2025) ·
(925) 370-5110 Dr. David Gardner, MDMonterey, CA · $48 in drug and device payments (2025) ·
(831) 624-5311 Dr. Ji Yeon Kim, MD, MPHNorth Hollywood, CA · No drug or device payments recorded (2025) ·
(818) 503-6710 Dr. Valerie Ng, MD PHDOakland, CA · No drug or device payments recorded (2025) ·
(510) 437-4671 Dr. Jefferson Chan, M.D., PH.D.Orange, CA · No drug or device payments recorded (2025) ·
(714) 456-6141 Dr. Maryam Ahmadi, MDOrange, CA · No drug or device payments recorded (2025) ·
(714) 456-8888 Dr. Richard S Newman, MDOrange, CA · No drug or device payments recorded (2025) ·
(714) 456-2986 Dr. Kristen Turowski, SLPAPalmdale, CA · No drug or device payments recorded (2025) ·
(661) 809-3821 Dr. Alin Girnita, PHDPalo Alto, CA · $1,458 in drug and device payments (2025) ·
(650) 736-8907 Dr. Bruce Patterson, MDPalo Alto, CA · No drug or device payments recorded (2025) ·
(650) 725-3864 Common questions
How many Clinical Pathology/Laboratory Medicine providers are in California?There are 131 Clinical Pathology/Laboratory Medicine providers with active NPI records practicing in California, according to federal NPPES data refreshed monthly.
Which cities in California have the most Clinical Pathology/Laboratory Medicine providers?San Francisco (28), Los Angeles (18), San Diego (10) have the highest concentration of Clinical Pathology/Laboratory Medicine providers in California.
How many Clinical Pathology/Laboratory Medicine providers in California received drug or device company payments?26 of 131 Clinical Pathology/Laboratory Medicine providers in California (20%) 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.
Which hospitals do Clinical Pathologists (Laboratory Medicine) in California work at?According to CMS facility affiliation records, the California hospitals where the most Clinical Pathologists (Laboratory Medicine) hold privileges are UC San Diego Health Hillcrest - Hillcrest Med Ctr in San Diego; UCSF Medical Center in San Francisco; Cedars-Sinai Medical Center in Los Angeles.
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