Gynecologic Oncologists in California
Data updated monthly · Last refresh October 2026
178 Gynecologic Oncology providers practice in California, including 91 (51%) offering telehealth. The largest concentration is in Sacramento. 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.
178providers
91telehealth
Sacramentotop city
Gynecologic Oncology by city in California
Choose a city to see providers there.
Where Gynecologic Oncologists in California practice
From CMS Medicare enrollment records covering 121 of the 178 providers listed here (68%). Providers who do not bill Medicare are not included in these figures.
7%solo or small practice (under 10 clinicians)
12%mid-size group (10 to 99)
81%large group or health system (100+)
Largest practice groups
| Group (as registered with Medicare) | Gynecologic Oncologists | All clinicians in group | Main city |
| City of Hope Medical Foundation | 11 | 964 | South Pasadena |
| UCSF Medical Group Business Services | 8 | 1,533 | San Francisco |
| Stanford Health Care | 7 | 3,152 | Stanford |
| Usc Care Medical Group Inc. | 7 | 1,378 | Los Angeles |
| Southern California Permanente Medical Group | 6 | 11,250 | Anaheim |
Hospitals where they hold privileges
| Hospital | City | Ownership | CMS star rating | Gynecologic Oncologists affiliated |
| UCSF Medical Center | San Francisco | Nonprofit | 4 of 5 | 8 |
| Stanford Health Care | Stanford | Nonprofit | 5 of 5 | 8 |
| Los Angeles General Medical Center | Los Angeles | Government | 2 of 5 | 7 |
| Stanford Health Care Tri-Valley | Pleasanton | Nonprofit | 5 of 5 | 6 |
| Providence Mission Hospital | Mission Viejo | Nonprofit | 5 of 5 | 6 |
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.
Gynecologic 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. Devansu Tewari, MDAnaheim, CA · $212 in drug and device payments (2025) ·
(714) 279-4103 Dr. Melanie Arora, M.D.Apple Valley, CA · $168 in drug and device payments (2025) ·
(760) 242-2146 Dr. Alan Schlaerth, M.D.Arcadia, CA · $8,374 in drug and device payments (2025) ·
(626) 898-8198 Dr. Amin Ramzan, M.D.Bakersfield, CA · $539 in drug and device payments (2025) · Telehealth ·
(661) 326-2000 Dr. Hansa Patel, MDBakersfield, CA · No drug or device payments recorded (2025) ·
(661) 328-1213 Dr. John Schlaerth, MDBakersfield, CA · $38 in drug and device payments (2025) · Telehealth ·
(661) 326-1401 Dr. Hyun Shvartsman, M.D.Baldwin Park, CA · $1,000 in drug and device payments (2025) ·
(626) 851-6087 Dr. Diana Cholakian Pearre, MDBurbank, CA · $3,096 in drug and device payments (2025) ·
(818) 847-4431 Dr. Lisa Bean, M.D.Calexico, CA · $134 in drug and device payments (2025) ·
(760) 357-2020 Dr. James Lilja, M.D.Campbell, CA · $7,101 in drug and device payments (2025) · Telehealth ·
(408) 827-4274 Dr. Tiffany Sia, M.D.Campbell, CA · $395 in drug and device payments (2025) · Telehealth ·
(408) 827-4274 Dr. Allyson Jang, MDCarmichael, CA · $127 in drug and device payments (2025) · Telehealth ·
(916) 863-8750 Dr. Kevin Elliott, MDCarmichael, CA · $172 in drug and device payments (2025) · Telehealth ·
(916) 556-3164 Dr. Alexandra Freeman, M.D.Clovis, CA · $893 in drug and device payments (2025) · Telehealth ·
(559) 451-3676 Dr. Alice Chen, MDClovis, CA · $247 in drug and device payments (2025) · Telehealth ·
(559) 451-3676 Dr. Ashley Moon, MDClovis, CA · $398 in drug and device payments (2025) · Telehealth ·
(559) 451-3676 Dr. Conley Lacey, M.D.Clovis, CA · No drug or device payments recorded (2025) ·
(559) 321-8709 Dr. Trung Nguyen, D.O.,M.B.A.Clovis, CA · $352 in drug and device payments (2025) · Telehealth ·
(559) 451-3676 Dr. Ernest Han, MDDuarte, CA · No drug or device payments recorded (2025) · Telehealth ·
(626) 256-4673 Dr. Lorna Rodriguez, MD, PHDDuarte, CA · $90 in drug and device payments (2025) · Telehealth ·
(626) 256-4673 Dr. Mark Wakabayashi, MDDuarte, CA · No drug or device payments recorded (2025) ·
(626) 256-4673 Dr. Mihae Song, MDDuarte, CA · $2,490 in drug and device payments (2025) · Telehealth ·
(626) 256-4673 Dr. Stephen Lee, MDDuarte, CA · $9,229 in drug and device payments (2025) ·
(626) 471-7100 Dr. Thanh Dellinger, M.D.Duarte, CA · $163 in drug and device payments (2025) · Telehealth ·
(626) 471-9353 Dr. Ramez Eskander, M.DEncinitas, CA · $169,928 in drug and device payments (2025) · Telehealth ·
(800) 926-8273 Dr. Robert Pretorius, MDFontana, CA · No drug or device payments recorded (2025) ·
(909) 427-3910 Dr. Yasmin Abedin, M.D.Fontana, CA · $1,207 in drug and device payments (2025) ·
(833) 574-2273 Dr. Erin Blake, MDFresno, CA · $213 in drug and device payments (2025) · Telehealth ·
(559) 326-1222 Dr. William Rich, M.D.Fresno, CA · No drug or device payments recorded (2025) ·
(559) 431-2443 Dr. Roger Schlesinger, MDFullerton, CA · No drug or device payments recorded (2025) ·
(714) 992-5350 Dr. Raffi Chalian, MDGlendale, CA · $4,378 in drug and device payments (2025) · Telehealth ·
(818) 484-8611 Dr. Cecil Lynch, MDGranite Bay, CA · No drug or device payments recorded (2025) ·
(916) 412-5504 Dr. Jay Shah, MDIrvine, CA · $23 in drug and device payments (2025) · Telehealth ·
(949) 932-5695 Dr. Josephine Kim, MDIrvine, CA · No drug or device payments recorded (2025) · Telehealth ·
(800) 826-4673 Dr. Joshua Cohen, M.D.Irvine, CA · $1,947 in drug and device payments (2025) · Telehealth ·
(949) 671-4673 Dr. Laurie Brunette, M.D.Irvine, CA · $178 in drug and device payments (2025) · Telehealth ·
(949) 671-4673 Dr. Priyal Dholakiya, MDLaguna Hills, CA · $662 in drug and device payments (2025) · Telehealth ·
(657) 241-8788 Dr. Cheryl Saenz, M.DLa Jolla, CA · No drug or device payments recorded (2025) ·
(800) 926-8273 Dr. Jo Marie Janco, M.D.La Jolla, CA · $548 in drug and device payments (2025) · Telehealth ·
(858) 824-5464 Dr. Michael Mchale, MDLa Jolla, CA · $8,006 in drug and device payments (2025) ·
(800) 926-8273 Dr. Michael Silverman, M.D.La Jolla, CA · $20 in drug and device payments (2025) ·
(858) 824-5464 Dr. Patrick PenalosaLa Jolla, CA · $312 in drug and device payments (2025) ·
(858) 657-7000 Dr. Sara Jordan, MDLa Jolla, CA · $333 in drug and device payments (2025) · Telehealth ·
(858) 824-5464 Dr. Joel Berchin, MDLa Mesa, CA · No drug or device payments recorded (2025) ·
(619) 463-7775 Dr. Robert Segnit, MDLa Mesa, CA · No drug or device payments recorded (2025) ·
(619) 463-7775 Dr. Linda HongLoma Linda, CA · $176 in drug and device payments (2025) · Telehealth ·
(909) 558-2262 Dr. Mazdak Momeni, M.D.Loma Linda, CA · $13,108 in drug and device payments (2025) · Telehealth ·
(909) 558-2262 Common questions
How many Gynecologic Oncology providers are in California?There are 178 Gynecologic Oncology providers with active NPI records practicing in California, according to federal NPPES data refreshed monthly.
Do Gynecologic Oncology providers in California offer telehealth?Yes. 91 of the 178 Gynecologic Oncology providers in California (about 51%) report offering telehealth services in CMS data.
Which cities in California have the most Gynecologic Oncology providers?Sacramento (22), Los Angeles (20), San Francisco (10) have the highest concentration of Gynecologic Oncology providers in California.
How many Gynecologic Oncology providers in California received drug or device company payments?117 of 178 Gynecologic Oncology providers in California (66%) 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 Gynecologic Oncologists in California work in independent practices or large health systems?Among 121 Gynecologic Oncologists in California enrolled in Medicare, 7% bill through a solo or small practice with fewer than 10 clinicians, 12% through a mid-size group of 10 to 99, and 81% through a large group or health system with 100 or more clinicians, according to CMS enrollment records.
Which hospitals do Gynecologic Oncologists in California work at?According to CMS facility affiliation records, the California hospitals where the most Gynecologic Oncologists hold privileges are UCSF Medical Center in San Francisco; Stanford Health Care in Stanford; Los Angeles General Medical Center in Los Angeles.
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