Anatomic Pathologists in California
Data updated monthly · Last refresh October 2026
387 Anatomic Pathology providers practice in California, including 1 (0%) 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.
387providers
1telehealth
Los Angelestop city
Anatomic Pathology by city in California
Choose a city to see providers there.
Where Anatomic Pathologists in California practice
From CMS Medicare enrollment records covering 174 of the 387 providers listed here (45%). Providers who do not bill Medicare are not included in these figures.
7%solo or small practice (under 10 clinicians)
22%mid-size group (10 to 99)
71%large group or health system (100+)
Largest practice groups
| Group (as registered with Medicare) | Anatomic Pathologists | All clinicians in group | Main city |
| Permanente Medical Group Inc. | 32 | 10,928 | Sacramento |
| University of California San Francisco | 19 | 1,780 | San Francisco |
| UCLA Pathology and Laboratory Medicine Group | 19 | 68 | Los Angeles |
| Stanford Health Care | 14 | 3,152 | Stanford |
| Regents of the Univ of Ca | 12 | 1,571 | Sacramento |
Hospitals where they hold privileges
| Hospital | City | Ownership | CMS star rating | Anatomic Pathologists affiliated |
| Ronald Reagan UCLA Medical Center | Los Angeles | Government | 4 of 5 | 18 |
| UCSF Medical Center | San Francisco | Nonprofit | 4 of 5 | 18 |
| Stanford Health Care | Stanford | Nonprofit | 5 of 5 | 15 |
| Santa Monica - UCLA Med Ctr & Orthopaedic Hospital | Santa Monica | Nonprofit | 5 of 5 | 14 |
| UCLA West Valley Medical Center | West Hills | For-profit | 2 of 5 | 13 |
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.
Anatomic Pathology 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. Kenneth Bloom, M.D.Aliso Viejo, CA · $12,288 in drug and device payments (2025) ·
(949) 425-5744 Dr. Lawrence Weiss, M.D.Aliso Viejo, CA · $2,435 in drug and device payments (2025) ·
(949) 643-7357 Dr. James Bennington, M.D.Belvedere, CA · No drug or device payments recorded (2025) ·
(415) 435-7706 Dr. Xiaoyuan Liu, MDBerkeley, CA · No drug or device payments recorded (2025) ·
(510) 559-4741 Dr. Richard Protzel, M.D.Beverly Hills, CA · No drug or device payments recorded (2025) ·
(310) 858-0874 Dr. Helen Yen, M.D.Brawley, CA · No drug or device payments recorded (2025) ·
(760) 351-3432 Dr. Bizhan Bandarchi Chamkhaleh, MDCanoga Park, CA · No drug or device payments recorded (2025) ·
(818) 280-5321 Dr. Derek Lyle, M.D.Carlsbad, CA · No drug or device payments recorded (2025) ·
(760) 516-5145 Dr. Daniel Phillips, M.D.Clovis, CA · No drug or device payments recorded (2025) ·
(559) 326-2800 Dr. William Pitts, MDClovis, CA · No drug or device payments recorded (2025) ·
(559) 326-2815 Dr. Fabiola Medeiros, M.D.Compton, CA · No drug or device payments recorded (2025) ·
(310) 225-3221 Dr. Paul Flanagan, M.D.Costa Mesa, CA · No drug or device payments recorded (2025) ·
(714) 957-0348 Dr. Bharat Nathwani, MDDuarte, CA · No drug or device payments recorded (2025) ·
(626) 256-4673 Dr. Huiqing Wu, MDDuarte, CA · No drug or device payments recorded (2025) ·
(626) 359-8111 Dr. Frederick Hanf, MDEureka, CA · No drug or device payments recorded (2025) ·
(707) 445-8121 Dr. Theodore Goldfarab, M.D.Fallbrook, CA · No drug or device payments recorded (2025) ·
(760) 695-8946 Dr. Melissa Stoppler, MDFoster City, CA · No drug or device payments recorded (2025) ·
(650) 556-0750 Dr. Amit Lamba, MDFremont, CA · No drug or device payments recorded (2025) ·
(510) 795-3000 Dr. Erica Clayton, M.D.Greenbrae, CA · No drug or device payments recorded (2025) ·
(415) 925-7174 Dr. John Metcalf, MDHayward, CA · No drug or device payments recorded (2025) ·
(510) 784-4000 Dr. Kerith Overstreet, M.D.Healdsburg, CA · No drug or device payments recorded (2025) ·
(707) 395-0336 Dr. Robert Stroup, MDIrvine, CA · No drug or device payments recorded (2025) ·
(949) 450-0145 Dr. Aida Rechdouni, M.D.La Crescenta, CA · No drug or device payments recorded (2025) ·
(888) 610-8909 Dr. James Thompson, M.D. PH.D.Ladera Ranch, CA · No drug or device payments recorded (2025) ·
(949) 481-7690 Dr. Marcos Lepe, MDLa Jolla, CA · $24 in drug and device payments (2025) ·
(858) 554-8605 Dr. Anwar Raza, M.D.Loma Linda, CA · No drug or device payments recorded (2025) ·
(909) 558-6422 Dr. Carlos Casiano, MD, MALoma Linda, CA · $117 in drug and device payments (2025) ·
(909) 831-3989 Dr. Chelsea HeimbaughLoma Linda, CA · No drug or device payments recorded (2025) ·
(909) 558-4094 Dr. Craig Zuppan, M.D.Loma Linda, CA · No drug or device payments recorded (2025) ·
(909) 558-5175 Dr. Evelyn Choo, M.D.Loma Linda, CA · No drug or device payments recorded (2025) ·
(909) 558-6422 Dr. Jeremy Deisch, MDLoma Linda, CA · No drug or device payments recorded (2025) ·
(909) 558-5170 Dr. Kevin Thompson, M.D.Loma Linda, CA · No drug or device payments recorded (2025) ·
(909) 558-4094 Dr. Mia Nepomuceno-perez, M.D.Loma Linda, CA · No drug or device payments recorded (2025) ·
(909) 558-6422 Dr. Michael GreasLoma Linda, CA · $117 in drug and device payments (2025) ·
(909) 558-4094 Dr. Paul Herrmann, M.D.Loma Linda, CA · No drug or device payments recorded (2025) ·
(909) 558-4000 Dr. Ravi Raghavan, M.D.Loma Linda, CA · $117 in drug and device payments (2025) ·
(909) 558-6422 Dr. Yan Chen Wongworawat, MD, PHDLoma Linda, CA · No drug or device payments recorded (2025) ·
(909) 558-4094 Dr. Nils Lambrecht, M.D., PH.D.Long Beach, CA · No drug or device payments recorded (2025) ·
(562) 826-8000 Dr. Sandor Szabo, MDLong Beach, CA · No drug or device payments recorded (2025) ·
(562) 826-5403 Dr. Alexander Judkins, M.D.Los Angeles, CA · No drug or device payments recorded (2025) ·
(323) 361-4516 Dr. Alexander NoboriLos Angeles, CA · No drug or device payments recorded (2025) ·
(310) 267-3561 Dr. Alex Oliveira-kowaleski, MDLos Angeles, CA · No drug or device payments recorded (2025) ·
(310) 794-7495 Dr. Anthony Sisk, DOLos Angeles, CA · No drug or device payments recorded (2025) ·
(310) 825-1149 Dr. Azra Zarrinpar, M.D.Los Angeles, CA · $393 in drug and device payments (2025) ·
(310) 435-1892 Dr. Behdokht Nowroozizadeh, M.D.Los Angeles, CA · No drug or device payments recorded (2025) ·
(323) 409-4606 Dr. Ben Glasgow, MDLos Angeles, CA · No drug or device payments recorded (2025) ·
(310) 794-8285 Dr. Cara MonroeLos Angeles, CA · No drug or device payments recorded (2025) ·
(205) 253-4216 Dr. Charles Lassman, MDLos Angeles, CA · No drug or device payments recorded (2025) ·
(310) 794-8285 Dr. Chi Lai, MDLos Angeles, CA · No drug or device payments recorded (2025) ·
(310) 794-7953 Common questions
How many Anatomic Pathology providers are in California?There are 387 Anatomic Pathology providers with active NPI records practicing in California, according to federal NPPES data refreshed monthly.
Do Anatomic Pathology providers in California offer telehealth?Yes. 1 of the 387 Anatomic Pathology providers in California (about 0%) report offering telehealth services in CMS data.
Which cities in California have the most Anatomic Pathology providers?Los Angeles (59), San Francisco (43), Stanford (33) have the highest concentration of Anatomic Pathology providers in California.
How many Anatomic Pathology providers in California received drug or device company payments?65 of 387 Anatomic Pathology providers in California (17%) 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 Anatomic Pathologists in California work in independent practices or large health systems?Among 174 Anatomic Pathologists in California enrolled in Medicare, 7% bill through a solo or small practice with fewer than 10 clinicians, 22% through a mid-size group of 10 to 99, and 71% through a large group or health system with 100 or more clinicians, according to CMS enrollment records.
Which hospitals do Anatomic Pathologists in California work at?According to CMS facility affiliation records, the California hospitals where the most Anatomic Pathologists hold privileges are Ronald Reagan UCLA Medical Center in Los Angeles; UCSF Medical Center in San Francisco; Stanford Health Care in Stanford.
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