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 192 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. Alison Omel, P.A.Irvine, CA 926041093856676
  2. Aaron Omlor, P.A.Rancho Mirage, CA 922701992948764
  3. Shimon Ommatyar, PA-CLos Angeles, CA 900571689330177
  4. Debra Omotosho, PAHarbor City, CA 907101972704864
  5. Jacqueline OnClaremont, CA 917111790679462
  6. Michelle OnElk Grove, CA 957571376489138
  7. Omar On, PA-CChico, CA 959261295889871
  8. Lyndsay Onaga, PA-CLong Beach, CA 908141912770579
  9. Andrew Onaka, PA-CCarmichael, CA 956081376078287
  10. Julia Ondarza, PA-CWalnut Creek, CA 945981013537794
  11. Naitivictor Ong, PALos Angeles, CA 900271013084862
  12. Paula Ong, PA-COakland, CA 946071730699034
  13. Heather Onnigian, PA-CLos Angeles, CA 900071033664198
  14. Maaya OnoThousand Oaks, CA 913601104404987
  15. John Onofre, PHYSICIAN ASSISTANTHuntington Park, CA 902551932320546
  16. Michael Onoh, PARiverside, CA 925051972662682
  17. Jon Onosaki, PA-COrange, CA 928681396059754
  18. Heather Ontiveros, PA-CMurrieta, CA 925621386890838
  19. Tammy OnuClearlake, CA 954221760997951
  20. Judith Onyepunuka, PALos Angeles, CA 900211700374600
  21. Richard Onysko, PAArcadia, CA 910071679683239
  22. Amelia Ooi, PA-CClaremont, CA 917111558146860
  23. Lorelei Opene, PA-CMission Viejo, CA 926911659350445
  24. Kimberly Opitz, MPA, PA-CNapa, CA 945581376875872
  25. Esther OpokuDowney, CA 902411881235968
  26. Betsy Oppezzo, P.A.-C, R.D, MSPASRedding, CA 960011639463144
  27. Ana Orantia, PA-CRiverside, CA 925061023632692
  28. Jorge Ordaz, PABaldwin Park, CA 917061194892968
  29. Samantha OregelVisalia, CA 932911316620495
  30. Aldina OrellanaSanta Maria, CA 934541245004852
  31. Isabel Orellana, PHYSICIAN ASSISTANTSacramento, CA 958161770657876
  32. Dana Victoria OrenaMonterey Park, CA 917541740146695
  33. Mark Oribello, PA-C, MPHTravis, CA 945351356582654
  34. Antonio Orihuela, PA-CLos Angeles, CA 900591134061948
  35. Iris Orion, PASacramento, CA 958171801531561
  36. Adriana Orloff, PARedding, CA 960011942711155
  37. Tanya Ornelas, MS,PA-CLos Angeles, CA 900221841493079
  38. Lennie Ornelaz, PABakersfield, CA 933041447269766
  39. Emmeline Oros, PAOrange, CA 928681659020329
  40. Kaci Orosco, PA-CEncinitas, CA 920241760622278
  41. Francisco Orozco, PABellflower, CA 907061811013048
  42. M.dolores Orozco, PHYSICIAN ASSISTANTSan Jose, CA 951161447563705
  43. Puja Orozco, PA-CSaint Helena, CA 945741568784635
  44. Nicole Orr, PA-CSan Diego, CA 921111215966742
  45. Justin Ryan Ortal, PARiverside, CA 925061366387698
  46. Alyssa Ortega, PA-CSan Francisco, CA 941051841803244
  47. Haley Ortega, PA-CPomona, CA 917661720797194
  48. Julia Ortega, PACarlsbad, CA 920091457401473
  49. Marina Ortega, PHYSICIAN ASSISTANTPetaluma, CA 949541316309438
  50. Sally Ortega, PACanoga Park, CA 913031588061501

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.