NPPES file of Aug 9, 2026

Occupational Therapy Assistant in California

1,869 NPPES records list occupational therapy assistant with a practice address in California, 5 per 100,000 residents, the 49th highest rate of 51. San Diego and Los Angeles have the most; each record links to the provider's NPI and the California license search. Page 25 of 38.

CMS NPPES registry, file of Aug 9, 2026; 2023 Census estimates · NUCC 224Z00000X · method

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

San Diego has the most, 124

  1. San Diego124
  2. Los Angeles105
  3. Sacramento56
  4. Anaheim43
  5. Long Beach43

Occupational Therapy Assistant records in California

  1. Jessica NovassarteianMontrose, CA 910201992402556
  2. Julie NoyolaLa Verne, CA 917501689054421
  3. Kekona Jazmin Nuezca, COTAGardena, CA 902481669262283
  4. Eden Nullar, COTALakeside, CA 920401548650203
  5. Katrina Nunez, C.O.T.A.Anaheim, CA 928051013224088
  6. Amir Nunez Arias, COTA/LPalmdale, CA 935521518600634
  7. Melissa O'ConnellAuburn, CA 956021205717493
  8. Simone O'Neill, COTA/LSan Diego, CA 921031467428953
  9. Laura OberlySunnyvale, CA 940871548028921
  10. Chadd Nicholas OcampoRedondo Beach, CA 902781700761582
  11. Vannessa Ocampo, COTALos Angeles, CA 900271508351529
  12. Nathan Ocasio, COTA/LLake Elsinore, CA 925321952997090
  13. Dina OchoaDowney, CA 902421699298141
  14. Lisette OchoaDowney, CA 902421033632591
  15. Paulette Ochoa, COTAFontana, CA 923361700276110
  16. Jason Ockey, COTA/LTustin, CA 927801215348651
  17. Teresa Odonnell, COTASan Diego, CA 921111841403383
  18. Jeannine Okel, COTAChula Vista, CA 919101003792987
  19. Ria Olaes, COTAEscondido, CA 920271316336050
  20. Susan Olander, COTAHuntington Beach, CA 926461427348622
  21. Patricia Ann OlilaGardena, CA 902481104794809
  22. Kayla OliphantLos Angeles, CA 900441184136251
  23. Jeremy OlivarChatsworth, CA 913111235826249
  24. Irma Olivares, COTASan Bernardino, CA 924081942185954
  25. Abraham OlivasSanta Ana, CA 927011982287173
  26. Melanie Oliver, COTA/LEscondido, CA 920261811385685
  27. Avelina OlsonSylmar, CA 913421598302978
  28. Deann OlsonLaguna Hills, CA 926531578262093
  29. April Olvera, COTA/LVictorville, CA 923921376486902
  30. Von Jared OmoSan Diego, CA 921051780208728
  31. Candice Ondracek, COTA/LSacramento, CA 958171871896993
  32. Brandon OngTemple City, CA 917801215633169
  33. Jennifer Ong, COTA/LSan Diego, CA 921271982092516
  34. Linh OngAnaheim, CA 928051295560241
  35. Christian OosterbaanFresno, CA 937261689066912
  36. Denise Orchanian, COTAClovis, CA 936111639567621
  37. Vinnice OrdazLos Angeles, CA 900341083129845
  38. Hegel Ordaz Gutierrez, COTA/LLos Angeles, CA 900291538731211
  39. Paige Ashleigh Ordonez, COTA/LLos Angeles, CA 900411740801372
  40. Allison OrozcoCarmichael, CA 956081366830887
  41. Talia Orozco, COTAPalm Desert, CA 922111093390817
  42. Elisa OrtaWhittier, CA 906021861802597
  43. Alfonso Ortiz, COTA/LNorth Hills, CA 913431861864183
  44. Cindy Ortiz, COTA/LHawthorne, CA 902501225686652
  45. Shannon OsborneHayward, CA 945441972993863
  46. Susana Osorio, OTAFresno, CA 937221851122030
  47. Maria Therese Faith Paca, B.S.Bakersfield, CA 933141578038998
  48. Stephanie PadillaNorwalk, CA 906501811830649
  49. Andre Padua, COTA/LEastvale, CA 928801083415285
  50. Kym Page-LahueAuburn, CA 956021336309525

Source: CMS NPPES, primary taxonomy 224Z00000X: records by practice city and the list of records, file of Aug 9, 2026.

California ranks 49 of 51 per resident

  1. Alabama5
  2. Georgia5
  3. Louisiana5
  4. California5
  5. District of Columbia4
  6. Utah4
  7. 50 states and D.C.12

Source: CMS NPPES, primary taxonomy 224Z00000X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.

0.1% of these records appear in a Medicare file, against 0.1% 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. California0.1%
  2. United States0.1%

Occupational Therapy Assistant records in California, measured

  • In a Medicare file2 of 1,869 · 0.1% here, 0.1% nationally
  • In the CMS Doctors and Clinicians file2 · 0.1% here, 0.1% nationally
  • Not updated in five years or more1,080 · 57.8% here, 72.0% nationally

Source: CMS NPPES, file of Aug 9, 2026 (primary taxonomy 224Z00000X); CMS Medicare Part D Prescribers 2024, MIPS 2023, Open Payments 2024 and Doctors and Clinicians, matched by NPI.

What the count covers

1,869 NPPES records list occupational therapy assistant (224Z00000X) as their primary taxonomy with a practice address in California: 5 per 100,000 residents against 12 nationally (50 states and D.C.). San Diego has 124 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. Pennsylvania2,155
  2. Illinois1,498
  3. Wisconsin1,460
  4. North Carolina1,357

States with a similar rate per 100,000

  1. Louisiana4.9
  2. Georgia5.1
  3. District of Columbia4.1
  4. Alabama5.5

The largest states

  1. Texas4,278
  2. Florida3,825
  3. New York2,732
  4. Ohio2,421
  5. Pennsylvania2,155

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.