OB-GYNs in California
Data updated monthly · Last refresh October 2026
5,103 Obstetrics & Gynecology providers practice in California, including 564 (11%) 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.
5,103providers
564telehealth
Los Angelestop city
Obstetrics & Gynecology by city in California
Choose a city to see providers there.
Obstetrics & Gynecology 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. Zachary Spalding, MDSan Luis Obispo, CA · No drug or device payments recorded (2025) ·
(805) 786-4111 Dr. Alethea Bernstein, M.D.San Marcos, CA · No drug or device payments recorded (2025) ·
(760) 510-5666 Dr. Amber Knight, MDSan Marcos, CA · No drug or device payments recorded (2025) ·
(760) 510-4329 Dr. Catherine Uchino, MDSan Marcos, CA · No drug or device payments recorded (2025) ·
(833) 574-2273 Dr. Eric Adiarte, M.D.San Marcos, CA · No drug or device payments recorded (2025) ·
(619) 528-5000 Dr. Erin Conroy, M.D.San Marcos, CA · $28 in drug and device payments (2025) ·
(760) 736-6767 Dr. George Kung, M.D.San Marcos, CA · No drug or device payments recorded (2025) ·
(760) 761-4088 Dr. Jorge Calderon, M.D.San Marcos, CA · No drug or device payments recorded (2025) ·
(760) 798-0503 Dr. Kelly Martinez, MDSan Marcos, CA · No drug or device payments recorded (2025) ·
(760) 736-6700 Dr. Marisa Alunni, M.D.San Marcos, CA · No drug or device payments recorded (2025) ·
(206) 498-0534 Dr. Marlene Pountney Levesque, MDSan Marcos, CA · $35 in drug and device payments (2025) ·
(760) 736-6700 Dr. Michelle Cabrera, M.D.San Marcos, CA · $37 in drug and device payments (2025) ·
(760) 736-6767 Dr. Mitchell Besser, MDSan Marcos, CA · No drug or device payments recorded (2025) ·
(760) 736-6780 Dr. Radmila Kazanegra, M.D.San Marcos, CA · No drug or device payments recorded (2025) ·
(858) 245-4078 Dr. Stephanie Smith, DOSan Marcos, CA · No drug or device payments recorded (2025) ·
(858) 574-2273 Dr. Susanne KlaudtSan Marcos, CA · No drug or device payments recorded (2025) ·
(760) 510-4329 Dr. Suzanne Schweikert, MDSan Marcos, CA · $121 in drug and device payments (2025) ·
(760) 736-6700 Dr. Ananth Natarajan, MDSan Marino, CA · No drug or device payments recorded (2025) ·
(626) 284-0077 Dr. David Speiser, MDSan Marino, CA · No drug or device payments recorded (2025) ·
(310) 608-9074 Dr. Ruey Chyr Kao, M.D.San Marino, CA · No drug or device payments recorded (2025) ·
(626) 622-0996 Dr. Alexandra Flessel, MDSan Mateo, CA · $115 in drug and device payments (2025) · Telehealth ·
(650) 344-1114 Dr. Alla Sragets, M.D.San Mateo, CA · $110 in drug and device payments (2025) ·
(650) 344-7799 Dr. Ana Mummah, MDSan Mateo, CA · No drug or device payments recorded (2025) ·
(650) 573-2222 Dr. Andrea Quintana, MDSan Mateo, CA · No drug or device payments recorded (2025) ·
(650) 573-3702 Dr. Beatrice Burke, MDSan Mateo, CA · $262 in drug and device payments (2025) ·
(650) 344-1114 Dr. Caroline Bowker, MDSan Mateo, CA · No drug or device payments recorded (2025) ·
(650) 573-2222 Dr. Charles Winkelstein, M.D.San Mateo, CA · No drug or device payments recorded (2025) ·
(650) 343-4288 Dr. Diana Douglass, MDSan Mateo, CA · No drug or device payments recorded (2025) ·
(650) 573-2222 Dr. Elizabeth Murphy, MDSan Mateo, CA · No drug or device payments recorded (2025) ·
(650) 344-1114 Dr. Emily YuSan Mateo, CA · $407 in drug and device payments (2025) ·
(650) 344-1114 Dr. Henry Hamilton, M.D.San Mateo, CA · $583 in drug and device payments (2025) ·
(650) 375-1800 Dr. Isabell Beddow, MDSan Mateo, CA · $36 in drug and device payments (2025) ·
(650) 458-8929 Dr. James Meier, MDSan Mateo, CA · No drug or device payments recorded (2025) ·
(650) 573-2222 Dr. James Tappan, M.D.San Mateo, CA · No drug or device payments recorded (2025) ·
(650) 347-5065 Dr. John Anderson, MDSan Mateo, CA · No drug or device payments recorded (2025) ·
(650) 573-2222 Dr. Maryam Arjomand, M.D.San Mateo, CA · $250 in drug and device payments (2025) · Telehealth ·
(650) 344-1114 Dr. Melissa Duncanson, MDSan Mateo, CA · $129 in drug and device payments (2025) ·
(650) 344-1114 Dr. Rubina Khilnani, MDSan Mateo, CA · No drug or device payments recorded (2025) ·
(650) 477-8112 Dr. Sandra Beretta, MDSan Mateo, CA · $202 in drug and device payments (2025) · Telehealth ·
(650) 344-1114 Dr. Scott Oesterling, MDSan Mateo, CA · $22 in drug and device payments (2025) ·
(650) 573-2222 Dr. Shelley Adams, MDSan Mateo, CA · No drug or device payments recorded (2025) ·
(650) 344-1114 Dr. Susan Spencer, MDSan Mateo, CA · No drug or device payments recorded (2025) ·
(650) 344-7799 Dr. William Lock, MDSan Mateo, CA · $22 in drug and device payments (2025) ·
(650) 573-2222 Dr. Zelda De La Cruz, MDSan Mateo, CA · No drug or device payments recorded (2025) ·
(650) 375-8482 Dr. Zena Kharsa, M.D.San Mateo, CA · No drug or device payments recorded (2025) ·
(650) 573-2036 Dr. Marvelle Maloney, M.D.San Pablo, CA · No drug or device payments recorded (2025) · Telehealth ·
(510) 724-9110 Dr. Matthew Fore, MDSan Pablo, CA · No drug or device payments recorded (2025) · Telehealth ·
(510) 893-1700 Dr. Jonathan Lee, M.D.San Pedro, CA · No drug or device payments recorded (2025) ·
(310) 547-0202 Dr. Maxwell Dartey, M.D.San Pedro, CA · No drug or device payments recorded (2025) ·
(310) 241-1350 Dr. Mehdi Hemmat, MDSan Pedro, CA · No drug or device payments recorded (2025) ·
(310) 831-1266 Conditions Obstetrics & Gynecology providers in California commonly treat
Patients often search by condition rather than specialty. These are conditions typically managed by Obstetrics & Gynecology providers. Individual practices vary, so confirm with the provider before booking.
- Pregnancy care
- Endometriosis
- Fibroids
- PCOS
- Menopause
- Contraception
Common questions
How many Obstetrics & Gynecology providers are in California?There are 5,103 Obstetrics & Gynecology providers with active NPI records practicing in California, according to federal NPPES data refreshed monthly.
Do Obstetrics & Gynecology providers in California offer telehealth?Yes. 564 of the 5,103 Obstetrics & Gynecology providers in California (about 11%) report offering telehealth services in CMS data.
Which cities in California have the most Obstetrics & Gynecology providers?Los Angeles (380), San Diego (278), San Francisco (249) have the highest concentration of Obstetrics & Gynecology providers in California.
How many Obstetrics & Gynecology providers in California received drug or device company payments?1,864 of 5,103 Obstetrics & Gynecology providers in California (37%) received at least one payment from a drug or device company in 2025, according to the federal Open Payments program.
What conditions do Obstetrics & Gynecology providers in California treat?Obstetrics & Gynecology providers commonly treat pregnancy care, endometriosis, fibroids, PCOS, menopause and related conditions. Individual practices vary, so confirm with the provider before booking.
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 OB-GYNs in California work in independent practices or large health systems?Among 2,619 OB-GYNs in California enrolled in Medicare, 18% bill through a solo or small practice with fewer than 10 clinicians, 16% through a mid-size group of 10 to 99, and 66% through a large group or health system with 100 or more clinicians, according to CMS enrollment records.
Which hospitals do OB-GYNs in California work at?According to CMS facility affiliation records, the California hospitals where the most OB-GYNs hold privileges are Hoag Memorial Hospital Presbyterian in Newport Beach; Cedars-Sinai Medical Center in Los Angeles; California Pacific Medical Ctr-Davies Campus Hosp in San Francisco.
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