NPPES file of Aug 9, 2026

Obstetrics Physician in California

174 NPPES records list obstetrics physician with a practice address in California, 0.4 per 100,000 residents, the 13th highest rate of 51. Los Angeles and San Francisco have the most; each record links to the provider's NPI and the California license search. Page 4 of 4.

CMS NPPES registry, file of Aug 9, 2026; 2023 Census estimates · NUCC 207VX0000X · 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, 15

  1. Los Angeles15
  2. San Francisco9
  3. San Diego7
  4. Orange6
  5. Sacramento6

Obstetrics Physician records in California

  1. Jennifer Tolen, M.D.San Diego, CA 921201770874794
  2. Dariush Tonkaboni, M.D.Sacramento, CA 958231487816146
  3. Stacey Tran, MDFremont, CA 945381346798345
  4. Charles Ugwu-Oju, M.D.Madera, CA 936381366534901
  5. Miel Vallejo-Brooks, MDSan Jose, CA 951281215952056
  6. Alyssa Van Dyk, M.D.Palm Springs, CA 922621073822573
  7. Vinh Vo, DORosemead, CA 917701932365962
  8. Paluk WaliaLos Angeles, CA 900481548674369
  9. Peter Wang, MDGarden Grove, CA 928431760490163
  10. Kristopher Waring, MDLos Angeles, CA 900271013410877
  11. Stephanie Warsheski, M.D.Orange, CA 928681033538608
  12. Mapitiyage Wijesinghe, M.D.Anaheim, CA 928051922001346
  13. Wanda Wilburn, M.D.Apple Valley, CA 923071639245806
  14. Lorine Wilcox, M.D.San Diego, CA 921541205171030
  15. Kelly Williams, M.D.Torrance, CA 905031275795874
  16. Douglas Woelkers, M.D.La Jolla, CA 920371013965748
  17. Derek Wong, M.D.Sacramento, CA 958251710218599
  18. Stephanie WyckoffFountain Valley, CA 927081679659080
  19. Halina YeeLos Angeles, CA 900951245868652
  20. John Yu, M.D.San Jose, CA 951281497803167
  21. Miao Yu, M.D.Irvine, CA 926121255466413
  22. Sepideh Zahedy-Kapusta, M.DLa Habra, CA 906311841495538
  23. Wanchi Zeng, M.D.West Covina, CA 917901578948279
  24. Johnathan ZhaoFresno, CA 937061568091544

Source: CMS NPPES, primary taxonomy 207VX0000X: records by practice city and the list of records, file of Aug 9, 2026.

California ranks 13 of 51 per resident

  1. Utah0.6
  2. Nebraska0.5
  3. Arkansas0.5
  4. California0.4
  5. Kansas0.4
  6. Illinois0.4
  7. 50 states and D.C.0.4

Source: CMS NPPES, primary taxonomy 207VX0000X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.

66.7% of these records appear in a Medicare file, against 73.6% 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. California66.7%
  2. United States73.6%

Obstetrics Physician records in California, measured

  • In a Medicare file116 of 174 · 66.7% here, 73.6% nationally
  • In the CMS Doctors and Clinicians file91 · 52.3% here, 58.2% nationally
  • Not updated in five years or more95 · 54.6% here, 55.7% nationally
  • Median graduation year2002 · the 91 records with a school on file

Source: CMS NPPES, file of Aug 9, 2026 (primary taxonomy 207VX0000X); CMS Medicare Part D Prescribers 2024, MIPS 2023, Open Payments 2024 and Doctors and Clinicians, matched by NPI.

What the count covers

174 NPPES records list obstetrics physician (207VX0000X) as their primary taxonomy with a practice address in California: 0.4 per 100,000 residents against 0.4 nationally (50 states and D.C.). Los Angeles has 15 of them (9%).

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. New York118
  2. Texas103
  3. Florida85
  4. Georgia64

States with a similar rate per 100,000

  1. Kansas0.4
  2. Illinois0.4
  3. New Jersey0.4
  4. Arkansas0.5

The largest states

  1. New York118
  2. Texas103
  3. Florida85
  4. Georgia64
  5. Michigan64

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.