NPPES file of Aug 9, 2026

Anatomic Pathology & Clinical Pathology Physician in California

1,554 NPPES records list anatomic pathology & clinical pathology physician with a practice address in California, 4 per 100,000 residents, the 38th highest rate of 51. Los Angeles and Stanford have the most; each record links to the provider's NPI and the California license search. Page 20 of 32.

CMS NPPES registry, file of Aug 9, 2026; 2023 Census estimates · NUCC 207ZP0102X · 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, 207

  1. Los Angeles207
  2. Stanford116
  3. San Diego106
  4. San Francisco78
  5. Sacramento46

Anatomic Pathology & Clinical Pathology Physician records in California

  1. Hao Nguyen, MDPomona, CA 917681407046659
  2. John Nguyen, M.D.La Jolla, CA 920371518165059
  3. Joshua Nguyen, DOSan Diego, CA 921031851031090
  4. Lawrence Nguyen, M.D.Los Angeles, CA 900331093964397
  5. Michael Nguyen, MDStanford, CA 943051336407220
  6. Si Nguyen, M.D.Garden Grove, CA 928431841234952
  7. Thong Nguyen, DORancho Mirage, CA 922701528263175
  8. Thuy Nguyen, M.D.San Francisco, CA 941431811228059
  9. Tuan Nguyen, M.D.Rosemead, CA 917701861406886
  10. Hongyu Ni, M.D.West Hollywood, CA 900481790086122
  11. Peter Nichols, MDLos Angeles, CA 900891104834142
  12. Catherine Nicka, MDYreka, CA 960971265819452
  13. Kenneth Nieberg, MDLos Angeles, CA 900041144281320
  14. Kaitlyn Nielson, MDSanta Barbara, CA 931051801392675
  15. Slawomir Niewiadomski, M.D.San Diego, CA 921081205841665
  16. Neshat Nilforoushan, MDSacramento, CA 958171770954042
  17. Mark Nishiki, MDStockton, CA 952041457385890
  18. Stephen Nishimura, MDSan Francisco, CA 941431457307688
  19. Chenchen Niu, MD, PHDLos Angeles, CA 900951316689656
  20. Rhoda NoallSouth San Francisco, CA 940801770547028
  21. Yvonne Noronha, MDVictorville, CA 923951871771238
  22. Roberto Novoa, MDStanford, CA 943051326272089
  23. Michael Nystrom, M.D.San Francisco, CA 941161316274871
  24. Lauren O'Brien, M.D.Los Angeles, CA 900331689608556
  25. Ryan O'Connell, M.D.Orange, CA 928681609288794
  26. Jennifer O'Dell, MDRancho Dominguez, CA 902201144209206
  27. Emily O'Rourke, M.D.Oakland, CA 946091437492386
  28. Sonia OadModesto, CA 953561699262485
  29. Jean Oak, MD, PHDStanford, CA 943051700178530
  30. Stephen Oh, D.O.Murrieta, CA 925631881867695
  31. Hovsep Ohan, MDModesto, CA 953561336777366
  32. John Ohara, MDWoodland Hills, CA 913671346309945
  33. Steven Ohsie, M.D.Rancho Dominguez, CA 902201871768820
  34. Kenechukwu Ojukwu, M.D.Los Angeles, CA 900951164863494
  35. Darren Okada, M.D.Riverside, CA 925011134245921
  36. Derick Okwan-Duodu, M.D.,PH.D.Stanford, CA 943051174969356
  37. Eric Ollila, MDStanford, CA 943051982191995
  38. Eric OlsenTorrance, CA 905021235326653
  39. Jean Olson, M.D.San Francisco, CA 941431942250097
  40. Kristin Olson, MDSacramento, CA 958171063551059
  41. Niels Olson, MDStanford, CA 943051407082100
  42. Maria Olvera, MDSanta Ana, CA 927041427019264
  43. Andrea Ong, M.D.Sacramento, CA 958161902826472
  44. Michael Orejudos, M.D.Travis Afb, CA 945351619950813
  45. Robert Orlando, M.D.Montebello, CA 906401457427437
  46. Nathalie Orloff, MDSanta Monica, CA 904041194732032
  47. Cyrus Oster, M.D.Culver City, CA 902321285995183
  48. Hemlata Oswal, M.D.Folsom, CA 956301164472759
  49. Oscar Otanez, M.D.Stanford, CA 943051225226590
  50. Faith Ough, M.D.Santa Barbara, CA 931051437341005

Source: CMS NPPES, primary taxonomy 207ZP0102X: records by practice city and the list of records, file of Aug 9, 2026.

California ranks 38 of 51 per resident

  1. Virginia4.2
  2. Indiana4.2
  3. Maine4.1
  4. California4.0
  5. North Carolina4.0
  6. Montana4.0
  7. 50 states and D.C.4.8

Source: CMS NPPES, primary taxonomy 207ZP0102X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.

65.1% of these records appear in a Medicare file, against 61.2% 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. California65.1%
  2. United States61.2%

Anatomic Pathology & Clinical Pathology Physician records in California, measured

  • In a Medicare file1,011 of 1,554 · 65.1% here, 61.2% nationally
  • In the CMS Doctors and Clinicians file892 · 57.4% here, 55.5% nationally
  • Not updated in five years or more943 · 60.7% here, 62.6% nationally
  • Median graduation year2003 · the 891 records with a school on file

Source: CMS NPPES, file of Aug 9, 2026 (primary taxonomy 207ZP0102X); CMS Medicare Part D Prescribers 2024, MIPS 2023, Open Payments 2024 and Doctors and Clinicians, matched by NPI.

What the count covers

1,554 NPPES records list anatomic pathology & clinical pathology physician (207ZP0102X) as their primary taxonomy with a practice address in California: 4 per 100,000 residents against 4.8 nationally (50 states and D.C.). Los Angeles has 207 of them (13%).

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. Texas1,424
  2. New York972
  3. Florida966
  4. Illinois789

States with a similar rate per 100,000

  1. North Carolina4.0
  2. Montana4.0
  3. New Jersey3.9
  4. Alabama3.9

The largest states

  1. Texas1,424
  2. New York972
  3. Florida966
  4. Illinois789
  5. Pennsylvania716

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.