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.
Where OB-GYNs in California practice
From CMS Medicare enrollment records covering 2,619 of the 5,103 providers listed here (51%). Providers who do not bill Medicare are not included in these figures.
18%solo or small practice (under 10 clinicians)
16%mid-size group (10 to 99)
66%large group or health system (100+)
Largest practice groups
| Group (as registered with Medicare) | OB-GYNs | All clinicians in group | Main city |
| Permanente Medical Group Inc. | 316 | 10,928 | Richmond |
| Southern California Permanente Medical Group | 215 | 11,250 | Los Angeles |
| Sutter Bay Medical Foundation | 154 | 3,783 | Fremont |
| Sutter Valley Medical Foundation | 68 | 2,473 | Sacramento |
| Obhg California PC | 62 | 94 | Riverside |
Hospitals where they hold privileges
| Hospital | City | Ownership | CMS star rating | OB-GYNs affiliated |
| Hoag Memorial Hospital Presbyterian | Newport Beach | Nonprofit | 5 of 5 | 70 |
| Cedars-Sinai Medical Center | Los Angeles | Nonprofit | 5 of 5 | 58 |
| California Pacific Medical Ctr-Davies Campus Hosp | San Francisco | Nonprofit | 3 of 5 | 58 |
| Peninsula Medical Center | Burlingame | Nonprofit | 5 of 5 | 45 |
| Memorialcare Saddleback Medical Center | Laguna Hills | Nonprofit | 4 of 5 | 44 |
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.
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. Sunthara Hay, DO2500 Alhambra Avenue, CA · No drug or device payments recorded (2025) ·
(925) 370-5110 Dr. Arlene Cosca, MDAlameda, CA · No drug or device payments recorded (2025) ·
(510) 749-5731 Dr. Barry Laven, MDAlameda, CA · No drug or device payments recorded (2025) ·
(510) 316-5359 Dr. Carol Gerdes, MDAlameda, CA · No drug or device payments recorded (2025) ·
(510) 864-0660 Dr. Kent Farney, MDAlameda, CA · No drug or device payments recorded (2025) ·
(510) 522-4130 Dr. Linh Hoang, MDAlameda, CA · No drug or device payments recorded (2025) ·
(510) 752-1000 Dr. Olivia Butt, M.D.Alameda, CA · $301 in drug and device payments (2025) · Telehealth ·
(510) 864-0660 Dr. Rajendra Ratnesar, MDAlameda, CA · $213 in drug and device payments (2025) ·
(510) 747-4585 Dr. Sophia Grabenstatter, MDAlameda, CA · No drug or device payments recorded (2025) ·
(510) 752-1000 Dr. Zarghoona Rahim, MDAlameda, CA · No drug or device payments recorded (2025) ·
(510) 749-5731 Dr. Zharmila TalmadgeAlameda, CA · No drug or device payments recorded (2025) ·
(510) 521-5600 Dr. Elsie Wu, M.D.Alhambra, CA · No drug or device payments recorded (2025) ·
(626) 289-1009 Dr. Haiping Wang, MDAlhambra, CA · No drug or device payments recorded (2025) ·
(626) 570-0467 Dr. John Chiang, MDAlhambra, CA · $50 in drug and device payments (2025) ·
(626) 282-5153 Dr. Kuang-yu Chen, M.DAlhambra, CA · No drug or device payments recorded (2025) ·
(626) 281-3381 Dr. Nicolai Foong, M.D.Alhambra, CA · $280 in drug and device payments (2025) ·
(626) 288-3015 Dr. Philip Chan, M.D.Alhambra, CA · No drug or device payments recorded (2025) ·
(626) 284-7300 Dr. Alice Lau, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(888) 988-2800 Dr. Amanda Michael, M.D.Anaheim, CA · No drug or device payments recorded (2025) ·
(714) 644-2000 Dr. Amin Fawwaz, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(714) 995-1866 Dr. Andrew Rutland, M.D., J.D.Anaheim, CA · No drug or device payments recorded (2025) ·
(714) 863-7443 Dr. Anne Hardebeck, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(888) 988-2800 Dr. Bel Barker, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(888) 988-2800 Dr. Betty Shen, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(888) 988-2800 Dr. Christian Boehmer, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(888) 988-2800 Dr. Cristina O'day, MDAnaheim, CA · $338 in drug and device payments (2025) · Telehealth ·
(714) 535-7245 Dr. Damien Moore, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(888) 988-2800 Dr. Deborah Sassoon, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(888) 988-2800 Dr. Debra Gierut, MDAnaheim, CA · $139 in drug and device payments (2025) ·
(888) 988-2800 Dr. Diana Patton, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(888) 988-2800 Dr. Diana Spak, MDAnaheim, CA · $3,237 in drug and device payments (2025) ·
(888) 988-2800 Dr. Doosa Sobouti-yanes, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(714) 644-3333 Dr. Gary Edwards, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(888) 988-2800 Dr. George Ahad, MDAnaheim, CA · $381 in drug and device payments (2025) ·
(714) 774-8870 Dr. Georgina Moyers, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(888) 988-2800 Dr. Gordon Pugmire, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(888) 988-2800 Dr. Helen Luong, MDAnaheim, CA · $1,030 in drug and device payments (2025) · Telehealth ·
(714) 535-8900 Dr. Hoa Tran, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(888) 988-2800 Dr. Jacquelyn Sammons, D.O. Dr. Jane Hong, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(714) 535-8900 Dr. Jay Yoo, M.D.Anaheim, CA · No drug or device payments recorded (2025) ·
(714) 821-8479 Dr. Jean Burke, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(888) 988-2800 Dr. Jean Lien, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(888) 988-2800 Dr. John Yee, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(714) 772-2390 Dr. Julie Henriksen, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(888) 988-2800 Dr. Julisa Bravo, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(888) 988-2800 Dr. Jun Ihara, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(888) 988-2800 Dr. Justin Chuang, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(714) 774-9900 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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