NPPES file of Aug 9, 2026

Behavior Analyst in California

20,348 NPPES records list behavior analyst with a practice address in California, 52 per 100,000 residents, the 5th highest rate of 51. Costa Mesa and San Diego have the most; each record links to the provider's NPI and the California license search. Page 396 of 407.

CMS NPPES registry, file of Aug 9, 2026; 2023 Census estimates · NUCC 103K00000X · method

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

Costa Mesa has the most, 1,239

  1. Costa Mesa1,239
  2. San Diego1,157
  3. Sacramento597
  4. Los Angeles534
  5. Woodland Hills509

Behavior Analyst records in California

  1. Hailey WilliamsWildomar, CA 925951992655336
  2. James WilliamsVisalia, CA 932771922573708
  3. Janise Williams, BCBADowney, CA 902421396206934
  4. Jasmine WilliamsValencia, CA 913551093679870
  5. Jennifer WilliamsSan Mateo, CA 944011639670417
  6. Jessica WilliamsSan Marcos, CA 920781538660030
  7. Jessica WilliamsCosta Mesa, CA 926261639800121
  8. John WilliamsCosta Mesa, CA 926261467163899
  9. Julian WilliamsCastro Valley, CA 945461043017825
  10. Karen WilliamsSan Luis Obispo, CA 934011255051561
  11. Kari Williams, BCBAWhittier, CA 906031629538715
  12. Karre Williams, BCBAKensington, CA 947081841750700
  13. Keshyra Williams, BCBA, LBALos Angeles, CA 900361912631037
  14. Kila WilliamsEncino, CA 914361558718858
  15. Kiya Williams, HIGH SCHOOL DIPLOMAAlameda, CA 945011023503745
  16. Krishelle WilliamsSan Ramon, CA 945831609186154
  17. Lisa Williams, BCBAPalmdale, CA 935511659995470
  18. Lyndsey WilliamsCorona, CA 928791194384545
  19. Lynn Williams, BCBATarzana, CA 913561295150639
  20. Marnie Williams, BCBADavis, CA 956181497368104
  21. Mattison Williams, HIGH SCHOOL DIPLOMAYucaipa, CA 923991770125346
  22. Melanie Williams, M.S., BCBACorona, CA 928791609454552
  23. Michelle WilliamsSan Ramon, CA 945831518528561
  24. Nashia WilliamsEncino, CA 913161184211278
  25. Nichole Williams, M.A., BCBAWestlake Village, CA 913611295136968
  26. Priscilla WilliamsIrvine, CA 926141013866938
  27. Quentasia WilliamsSherman Oaks, CA 914031225778640
  28. Regina WilliamsHayward, CA 945411508409111
  29. Sarah WilliamsFremont, CA 945381083185359
  30. Savannah WilliamsWoodland Hills, CA 913671609347467
  31. Shana WilliamsVan Nuys, CA 914061942612122
  32. Shante Williams, BCBAConcord, CA 945201023473048
  33. Shantel WilliamsRancho Cucamonga, CA 917301982533790
  34. Sierra WilliamsTracy, CA 953771093470908
  35. Tamarind Williams, HIGH SCHOOL DIPLOMAYucaipa, CA 923991073155370
  36. Terrence Williams, HIGH SCHOOL DIPLOMAYucaipa, CA 923991952943524
  37. Tessa WilliamsSalinas, CA 939011225699663
  38. Timothy WilliamsMonterey Park, CA 917541851922447
  39. Valerie WilliamsChico, CA 959731659166627
  40. Vincent WilliamsBrentwood, CA 945131316718000
  41. William WilliamsRiverside, CA 925041336790583
  42. Tyasia Williams Smith, BCBAVan Nuys, CA 914011366007304
  43. Sarah Williams-KatuliLos Angeles, CA 900101831523919
  44. Caleb Williamson, M.A., BCBAEureka, CA 955031013875418
  45. Elizabeth Williamson, MA, BCBALos Angeles, CA 900571144563388
  46. Greg WilliamsonManhattan Beach, CA 902661902463359
  47. Hollie WilliamsonBakersfield, CA 933091770016297
  48. Lanise WilliamsonTorrance, CA 905021891268942
  49. Marissa Williamson, BCBAThousand Oaks, CA 913601942512496
  50. Kauron WillimasSacramento, CA 958341518469154

Source: CMS NPPES, primary taxonomy 103K00000X: records by practice city and the list of records, file of Aug 9, 2026.

California ranks 5 of 51 per resident

  1. Massachusetts67
  2. Hawaii63
  3. Florida60
  4. California52
  5. New Mexico47
  6. Oklahoma44
  7. 50 states and D.C.32

Source: CMS NPPES, primary taxonomy 103K00000X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.

under 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. California0.0%
  2. United States0.1%

Behavior Analyst records in California, measured

  • In a Medicare file5 of 20,348 · under 0.1% here, 0.1% nationally
  • In the CMS Doctors and Clinicians file14 · 0.1% here, 0.1% nationally
  • Not updated in five years or more10,235 · 50.3% here, 47.0% nationally
  • Median graduation year2017 · the 14 records with a school on file

Source: CMS NPPES, file of Aug 9, 2026 (primary taxonomy 103K00000X); CMS Medicare Part D Prescribers 2024, MIPS 2023, Open Payments 2024 and Doctors and Clinicians, matched by NPI.

What the count covers

20,348 NPPES records list behavior analyst (103K00000X) as their primary taxonomy with a practice address in California: 52 per 100,000 residents against 32 nationally (50 states and D.C.). Costa Mesa has 1,239 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. Florida13,565
  2. Texas5,837
  3. New York5,183
  4. Massachusetts4,718

States with a similar rate per 100,000

  1. New Mexico47.5
  2. Oklahoma44.0
  3. New Hampshire41.8
  4. Hawaii63.5

The largest states

  1. Florida13,565
  2. Texas5,837
  3. New York5,183
  4. Massachusetts4,718
  5. Nevada4,540

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.