NPPES file of Aug 9, 2026

Obstetrics & Gynecology Physician in California

5,088 NPPES records list obstetrics & gynecology physician with a practice address in California, 13 per 100,000 residents, the 29th highest rate of 51. Los Angeles and San Diego have the most; each record links to the provider's NPI and the California license search. Page 68 of 102.

CMS NPPES registry, file of Aug 9, 2026; 2023 Census estimates · NUCC 207V00000X · method

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Los Angeles has the most, 381

  1. Los Angeles381
  2. San Diego279
  3. San Francisco250
  4. Sacramento198
  5. San Jose129

Obstetrics & Gynecology Physician records in California

  1. Jesusa OcampoLos Angeles, CA 900031821130204
  2. Janna Ochoa, MDSan Francisco, CA 941151922686179
  3. Laetitia Oderman, M.D.Santa Cruz, CA 950651437328465
  4. Roumta Odisho, MDLa Mesa, CA 919421467956276
  5. Scott Oesterling, MDSan Mateo, CA 944031457422701
  6. Eliza Ofir, MDLa Jolla, CA 920371750919528
  7. Dawn Ogawa, M.D.Oakland, CA 946111902015894
  8. Danielle Ogez, M.D.Orange, CA 928691407201049
  9. Janelle Ogura, MDMilpitas, CA 950351083786883
  10. Kimberly Ohlson, MDDavis, CA 956161497833131
  11. Alonso Ojeda, M.D., F.A.C.O.G.Riverside, CA 925061215020169
  12. Nneoma Ojiaku, M.D.Sacramento, CA 958231811335235
  13. Shammah Okai, MDSan Jose, CA 951281023694072
  14. Chikanele Okorie, M.D.Stockton, CA 952041457643330
  15. Salman Okour, M.DFountain Valley, CA 927081265691505
  16. Heidi Olander, MDSan Jose, CA 951191124104625
  17. Mary Olender, M.D.West Hills, CA 913071922199504
  18. Stanley Olenick, MDLong Beach, CA 908061942342001
  19. Anne Oliphant, M.D.Oxnard, CA 930331184060956
  20. Michelle Oliveira, M.D.Dublin, CA 945681003835653
  21. Daniel Oliver, MDNapa, CA 945581568540300
  22. Vanessa Olsen, M.D.Santa Clara, CA 950511265680748
  23. Thomas Omalev, MDSan Diego, CA 921201356400972
  24. Shadi Omidi, M.D.San Diego, CA 921211366454548
  25. Mary Oneill, MDCampbell, CA 950081215142419
  26. Ojiugo Onwumere, MDWest Hollywood, CA 900481295470128
  27. Mona Orady, M.D.Walnut Creek, CA 945971003970773
  28. Sonia Ordonez, MDOakland, CA 946111215049986
  29. Rita Oregon, M.D.Sylmar, CA 913421245330943
  30. William Origel, M.D.Montebello, CA 906401265499727
  31. Teresita Oro, M.DSun Valley, CA 913521356384192
  32. Nancy Oropeza, M.D.National City, CA 919501154854917
  33. Madeleine Ortega, MDPanorama City, CA 914021619171741
  34. Noelle Ortiz, MDMurrieta, CA 925621447838222
  35. Xavier Ortiz, M.D.Vallejo, CA 945891952304859
  36. Lucila Ortiz-Barron, M.D.Lemoore, CA 932461942253646
  37. Hans Orup, M.D.Monte Sereno, CA 950301922140961
  38. Kathryn Osei-BonsuSanta Rosa, CA 954031174159164
  39. Bryan Oshiro, M.D.Loma Linda, CA 923541780608489
  40. Karen Oshiro, MDFontana, CA 923351326196130
  41. Joelle Osias, MDRedwood City, CA 940631225102528
  42. Elizabeth Oslund, MDLos Angeles, CA 900331235625401
  43. Phyllis Oster, M.D.Long Beach, CA 908081902817919
  44. Terre Osterkamp, M.D.Glendale, CA 912081538134549
  45. Paul Ostoya, M.D.Fresno, CA 937101649318338
  46. Felicia Ota, M.D.Encino, CA 914361003912270
  47. Lin Ota, M.D.Riverside, CA 925091740424415
  48. Mary Otoole, MDLaguna Hills, CA 926531790743748
  49. Gary Ott, M.D.West Hills, CA 913071124035688
  50. Maria Ottavi, MDSanta Monica, CA 904041841208766

Source: CMS NPPES, primary taxonomy 207V00000X: records by practice city and the list of records, file of Aug 9, 2026.

California ranks 29 of 51 per resident

  1. Wisconsin13
  2. Ohio13
  3. Washington13
  4. California13
  5. Indiana13
  6. Georgia13
  7. 50 states and D.C.14

Source: CMS NPPES, primary taxonomy 207V00000X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.

73.5% of these records appear in a Medicare file, against 75.6% nationally

A Medicare file here is Part D prescribing (2024), a MIPS score (2023), an Open Payments record (2024) or Medicare group billing (CMS Doctors and Clinicians). A record outside them may still see patients: these files cover Medicare only.

  1. California73.5%
  2. United States75.6%

Obstetrics & Gynecology Physician records in California, measured

  • In a Medicare file3,740 of 5,088 · 73.5% here, 75.6% nationally
  • In the CMS Doctors and Clinicians file2,703 · 53.1% here, 60.3% nationally
  • Not updated in five years or more3,239 · 63.7% here, 56.2% nationally
  • Median graduation year2004 · the 2,700 records with a school on file

Source: CMS NPPES, file of Aug 9, 2026 (primary taxonomy 207V00000X); CMS Medicare Part D Prescribers 2024, MIPS 2023, Open Payments 2024 and Doctors and Clinicians, matched by NPI.

What the count covers

5,088 NPPES records list obstetrics & gynecology physician (207V00000X) as their primary taxonomy with a practice address in California: 13 per 100,000 residents against 14 nationally (50 states and D.C.). Los Angeles has 381 of them (7%).

A record is a registration a provider made and keeps up to date: it shows neither that the provider is licensed nor that they still practice there. The state's own license search is the check.

States with a similar number

  1. Texas3,524
  2. New York3,174
  3. Florida2,601
  4. Illinois2,062

States with a similar rate per 100,000

  1. Indiana13.0
  2. Georgia13.0
  3. Washington13.3
  4. Ohio13.3

The largest states

  1. Texas3,524
  2. New York3,174
  3. Florida2,601
  4. Illinois2,062
  5. Pennsylvania1,974

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy; 2023 Census population estimates. A registry record is not a license.

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.