NPPES file of Aug 9, 2026

Ambulatory Care Registered Nurse in California

940 NPPES records list ambulatory care registered nurse with a practice address in California, 2.4 per 100,000 residents, the 7th highest rate of 51. Los Angeles and Oakland have the most; each record links to the provider's NPI and the California license search. Page 4 of 19.

CMS NPPES registry, file of Aug 9, 2026; 2023 Census estimates · NUCC 163WP2201X · 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, 272

  1. Los Angeles272
  2. Oakland78
  3. Torrance78
  4. Van Nuys54
  5. Sylmar49

Ambulatory Care Registered Nurse records in California

  1. Ana Casillas, RNLos Angeles, CA 900331952822322
  2. Melody Casillas, RNTorrance, CA 905021316476856
  3. Jacqueline CastanedaVan Nuys, CA 914051043740632
  4. Jennifer CastilloLos Angeles, CA 900221831619584
  5. Lily Castillon, RNSan Jose, CA 951381023838521
  6. Irene CastroTorrance, CA 905021669992426
  7. Julie CastroLancaster, CA 935351487366944
  8. Wilmer Castro, RNSan Fernando, CA 913401811861933
  9. Tamara CatheyTorrance, CA 905021558881888
  10. Marie CeballosSacramento, CA 958231184232647
  11. Mary Joan CentinaVan Nuys, CA 914051477082741
  12. Claudia Cervantes, REGISTERED NURSELos Angeles, CA 900221992407936
  13. Emily CervantesVan Nuys, CA 914051871014357
  14. Roberta Chaidez, RNDowney, CA 902421104368299
  15. Aleksan ChakhoyanGlendale, CA 912061629507900
  16. Maria Victoria ChanDowney, CA 902421871462663
  17. Cecy Chang, RNLos Angeles, CA 900071710408067
  18. Sergio Chang, REGISTERED NURSETorrance, CA 905021952831034
  19. Pauline Chapman, RNOakland, CA 946021326507476
  20. Marie Charles, REGISTERED NURSELos Angeles, CA 900031104532670
  21. Mimi Chau, REGISTERED NURSEOakland, CA 946021275098816
  22. Tania ChavezLos Angeles, CA 900331609391747
  23. Henry ChendraCompton, CA 902221104355726
  24. Josephine Chendra, REGISTERED NURSELos Angeles, CA 900591659077717
  25. Patricia Chendra, REGISTERED NURSELos Angeles, CA 900591629784590
  26. Rosemary ChendraLos Angeles, CA 900221992551493
  27. Cheng ChengEl Monte, CA 917311841056876
  28. Hun Cher, REGISTERED NURSETorrance, CA 905021316461197
  29. Lisa Cherqaoui, RNPasadena, CA 911031467945287
  30. Leticia Cheung, NURSE PRACTITIONERLos Angeles, CA 900331821736166
  31. Janice ChewSylmar, CA 913421114447422
  32. Su ChiLos Angeles, CA 900591811427461
  33. Shun-Wen Chiang, RNLos Angeles, CA 900331992227383
  34. Jae ChoVan Nuys, CA 914051881123156
  35. Wan-Hee ChoDowney, CA 902421043744261
  36. Jihee ChoiLa Habra, CA 906311912613258
  37. Jane ChonVan Nuys, CA 914051952831588
  38. Susan Christilaw, RNMarina, CA 939331427896760
  39. Bongsill ChungLos Angeles, CA 900591093244006
  40. Seung ChungTorrance, CA 905031366158677
  41. Jessica CifuentesLos Angeles, CA 900331902327307
  42. Don Dee Cinco, REGISTERED NURSEMerced, CA 953401801632773
  43. Janet Clayton, RNOakland, CA 946021184184384
  44. Brandy ColeLa Puente, CA 917441548887052
  45. Valerie Coleman, RNOakland, CA 946021184294308
  46. Stacie Collier, RNPalo Alto, CA 943041992516462
  47. Justine ConstantinoLos Angeles, CA 900331417478868
  48. Gabriela ContrerasLancaster, CA 935351750093274
  49. Pamela ContrerasVan Nuys, CA 914051801325808
  50. Amber Cook, BSN, RNLancaster, CA 935351679448336

Source: CMS NPPES, primary taxonomy 163WP2201X: records by practice city and the list of records, file of Aug 9, 2026.

California ranks 7 of 51 per resident

  1. Wyoming2.7
  2. Alaska2.6
  3. Wisconsin2.6
  4. California2.4
  5. Massachusetts2.3
  6. Rhode Island2.2
  7. 50 states and D.C.1.0

Source: CMS NPPES, primary taxonomy 163WP2201X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.

2.2% of these records appear in a Medicare file, against 1.3% 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. California2.2%
  2. United States1.3%

Ambulatory Care Registered Nurse records in California, measured

  • In a Medicare file21 of 940 · 2.2% here, 1.3% nationally
  • In the CMS Doctors and Clinicians file5 · 0.5% here, 0.4% nationally
  • Not updated in five years or more413 · 43.9% here, 42.7% nationally

Source: CMS NPPES, file of Aug 9, 2026 (primary taxonomy 163WP2201X); CMS Medicare Part D Prescribers 2024, MIPS 2023, Open Payments 2024 and Doctors and Clinicians, matched by NPI.

What the count covers

940 NPPES records list ambulatory care registered nurse (163WP2201X) as their primary taxonomy with a practice address in California: 2.4 per 100,000 residents against 1 nationally (50 states and D.C.). Los Angeles has 272 of them (29%).

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. Ohio199
  2. Massachusetts164
  3. Texas159
  4. Wisconsin151

States with a similar rate per 100,000

  1. Alaska2.6
  2. Rhode Island2.2
  3. Wyoming2.7
  4. Nebraska1.9

The largest states

  1. Ohio199
  2. Massachusetts164
  3. Texas159
  4. Wisconsin151
  5. Michigan130

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.