NPPES file of Aug 9, 2026

Physician Assistant in California

14,451 NPPES records list physician assistant with a practice address in California, 37 per 100,000 residents, the 41st 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 189 of 290.

CMS NPPES registry, file of Aug 9, 2026; 2023 Census estimates · NUCC 363A00000X · 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, 935

  1. Los Angeles935
  2. San Diego747
  3. San Francisco488
  4. Stanford480
  5. Sacramento387

Physician Assistant records in California

  1. Rachel O'Connor, PA-CSan Diego, CA 921031295461234
  2. Brian O'Donnell, PASan Francisco, CA 941581790740900
  3. Sandra O'Donnell, PA-CPasadena, CA 911051548223266
  4. Sean O'DonnellPomona, CA 917661952889982
  5. Chere O'Grady, P.A-CVictorville, CA 923951619912482
  6. Ellen O'Halloran, P.A.-CSanta Cruz, CA 950621346618071
  7. Shelby O'HaraSan Mateo, CA 944011427762160
  8. Enya O'KanePalo Alto, CA 943011083361547
  9. Katelyn O'Keefe, PA-CTorrance, CA 905051174208086
  10. Breanne O'Leary, PASan Diego, CA 921031295181311
  11. Zachary O'Leary, PA-CCastro Valley, CA 945461083298178
  12. Ariana O'Malley, PAPalo Alto, CA 943041083325336
  13. Caitlin O'Malley, PARocklin, CA 957651265100853
  14. Emma O'Malley, PA-CAuburn, CA 956021821820820
  15. Susan O'MalleySan Jose, CA 951241568429447
  16. Robert O'Mara, PA-CSan Diego, CA 921131336174382
  17. Tamara O'Nan, PA-CNewport Beach, CA 926601477837862
  18. Emily O'Neal, PA-CFolsom, CA 956301932304623
  19. Timothy O'Neil, PA-CSan Diego, CA 921021447779400
  20. Brian O'NeillTrabuco Canyon, CA 926791770168031
  21. Catherine O'Neill, PA-CConcord, CA 945211407455116
  22. Tammy O'Neill, PA-CBishop, CA 935141548454101
  23. Michael O'Reilly, PA-COrange, CA 928681669139879
  24. Cristina O'Rourke, PA-CFullerton, CA 928351578102810
  25. Ashley Oakley, M.H.S, P.A.-CSan Francisco, CA 941181952464562
  26. Jessica Oakley, P.A.Fresno, CA 937111255841383
  27. Scott Obana, PA-CRoseville, CA 956611265930531
  28. Ross Obenauer, PA-CLos Angeles, CA 900371740458827
  29. Brooklyn Ober, PA-CColton, CA 923241982595757
  30. Lisa Ober, PAWoodland Hills, CA 913671801013388
  31. Kelsey Oberg, PA-CSan Diego, CA 921191992306872
  32. David Oberst, P.A.Hanford, CA 932301982642351
  33. Ramona Obeso, PA-CSanta Ana, CA 927011902092596
  34. Andressa Obice, PA-CSan Jose, CA 951201154096196
  35. Kimberly Obidiegwu, PAFresno, CA 937201083228738
  36. Kyrian ObidiegwuClovis, CA 936111891309688
  37. Leeanne ObilorCorte Madera, CA 949251982369575
  38. Pauline Oblitas, PA-CBurbank, CA 915051669743506
  39. Alyson Oblock, PA-CSan Diego, CA 921301508414012
  40. Evangeline Obrero, PA-CChino Hills, CA 917091073844650
  41. Reynaldo Obrero, P.A.-CPomona, CA 917661275784852
  42. Douglas ObrienGreenbrae, CA 949041235158239
  43. Elizabeth Obryan, PAStanford, CA 943051497406391
  44. Gina Obsenares, PA-CBurbank, CA 915051871703777
  45. Walter Ocalap'Lapit, PA-CNewport Beach, CA 926601174724785
  46. Nicole OcampianReseda, CA 913351780205278
  47. Areli OcampoVallejo, CA 945921457179749
  48. Dennis Ocampo, PA-CSan Diego, CA 921341740425883
  49. Gina Ocampo, PA-CCorona, CA 928821437495173
  50. Kristianne Ocampo, PAStanford, CA 943051316414386

Source: CMS NPPES, primary taxonomy 363A00000X: records by practice city and the list of records, file of Aug 9, 2026.

California ranks 41 of 51 per resident

  1. Georgia42
  2. New Mexico40
  3. Illinois39
  4. California37
  5. New Jersey37
  6. Texas36
  7. 50 states and D.C.49

Source: CMS NPPES, primary taxonomy 363A00000X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.

75.2% of these records appear in a Medicare file, against 77.9% 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. California75.2%
  2. United States77.9%

Physician Assistant records in California, measured

  • In a Medicare file10,860 of 14,451 · 75.2% here, 77.9% nationally
  • In the CMS Doctors and Clinicians file7,218 · 49.9% here, 62.6% nationally
  • Not updated in five years or more5,775 · 40.0% here, 39.3% nationally
  • Median graduation year2018 · the 7,214 records with a school on file

Source: CMS NPPES, file of Aug 9, 2026 (primary taxonomy 363A00000X); CMS Medicare Part D Prescribers 2024, MIPS 2023, Open Payments 2024 and Doctors and Clinicians, matched by NPI.

What the count covers

14,451 NPPES records list physician assistant (363A00000X) as their primary taxonomy with a practice address in California: 37 per 100,000 residents against 49 nationally (50 states and D.C.). Los Angeles has 935 of them (6%).

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 York15,555
  2. Texas10,999
  3. Florida10,257
  4. North Carolina9,279

States with a similar rate per 100,000

  1. New Jersey36.5
  2. Indiana35.3
  3. Illinois39.3
  4. New Mexico40.1

The largest states

  1. New York15,555
  2. Texas10,999
  3. Florida10,257
  4. North Carolina9,279
  5. Pennsylvania8,020

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.