NPPES file of Aug 9, 2026

Research Study Specialist in California

82 NPPES records list research study specialist with a practice address in California, 0.2 per 100,000 residents, the 8th highest rate of 41. Los Angeles and Palo Alto have the most; each record links to the provider's NPI and the California license search. Page 1 of 2.

CMS NPPES registry, file of Aug 9, 2026; 2023 Census estimates · NUCC 1744R1102X · 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, 8

  1. Los Angeles8
  2. Palo Alto8
  3. San Francisco6
  4. Oakland4
  5. Davis3

Research Study Specialist records in California

  1. Kristen Aiemjoy, PHDDavis, CA 956161245197185
  2. Naama Barnea-Goraly, M.D.Menlo Park, CA 940251205372315
  3. Ignacio BaselgaVenice, CA 902911427910173
  4. Brianna BekierAnaheim, CA 928061831478825
  5. James Berenson, M.D.West Hollywood, CA 900691124051560
  6. Stefanie Blanco, TEACHING CREDENTIALSan Jose, CA 951221306978598
  7. Bryant Borihane, PHDPomona, CA 917661609209303
  8. Giovanni Cacciamani, MDLos Angeles, CA 900891104548650
  9. Robert ContrerasLos Angeles, CA 900221841620333
  10. Kathie Dalessandri, M.D.Point Reyes Station, CA 949561184991366
  11. Jamie Dananberg, MDBrisbane, CA 940051134648397
  12. Ashley DargertGilroy, CA 950201619625340
  13. Jaimie Davis, PHD, RDLos Angeles, CA 900331174754469
  14. Marilyn Douglas, DNSC, RN, FAANPalo Alto, CA 943061326269960
  15. Vladimir Dranovskiy, MDLong Beach, CA 908221093996068
  16. Lisa Duncan, BUSINESS OWNERAntioch, CA 945091689495921
  17. Albert GarciaGranada Hills, CA 913441891655973
  18. Anthony Golsorkhi, MDSan Francisco, CA 941101669339776
  19. Michael Goran, PHDLos Angeles, CA 900331639300940
  20. Axel GuzmanOakland, CA 946121689381972
  21. Jon Haber, PHDMenlo Park, CA 940251053556142
  22. Barbara Holshouser, PHDLoma Linda, CA 923541659545531
  23. Seyed HosseiniPalo Alto, CA 943041255212742
  24. Alicia IngramCampbell, CA 950081497054753
  25. Hiroshi ItoPalo Alto, CA 943041790966869
  26. Michael Jensen, MDDuarte, CA 910101609064625
  27. Philip Jochelson, M.D.Foster City, CA 944041982046231
  28. Carl JohnsonClaremont, CA 917111750077855
  29. Irina KashubaHuntington Beach, CA 926471932067956
  30. Simranjit Kaur, MPHYuba City, CA 959931053126615
  31. Kenneth Kern, MDSan Diego, CA 921211295993459
  32. Robert Kern, PHDLos Angeles, CA 900731932201969
  33. Kenneth Krantz, M.D., PHD.San Mateo, CA 944011073987087
  34. Maksym Kuchma, MD, PHDGlendale, CA 912041245195718
  35. Geliya KudryavtsevaPalo Alto, CA 943041053265744
  36. Kristina Lai, MPHDavis, CA 956161396699757
  37. William Lang, M.D.Mill Valley, CA 949411326445065
  38. Albert Lee, M.D.Sylmar, CA 913421205387420
  39. Jonathan Leff, M.D.Menlo Park, CA 940251538407721
  40. Monica Lopez, MAMontebello, CA 906401518625110
  41. Manuel Marroquin, CDMLos Angeles, CA 900481164398608
  42. Juan MartinezLos Angeles, CA 900131861337859
  43. Timothy McCall, M.D.Oakland, CA 946091326376336
  44. Donna Metz, PHDAlhambra, CA 918031467785238
  45. Thomas Moss, M.D.Van Nuys, CA 914061558783712
  46. Yu NakamuraPalo Alto, CA 943041962348623
  47. Fateme Nateghi HaredashtPalo Alto, CA 943041497600225
  48. Yoko Ono, M.D.Sacramento, CA 958161699006049
  49. Jasenka Orion, M.A.San Bernardino, CA 924011720330798
  50. Lars Osterberg, MDPalo Alto, CA 943041538100243

Source: CMS NPPES, primary taxonomy 1744R1102X: records by practice city and the list of records, file of Aug 9, 2026.

California ranks 8 of 41 per resident

  1. Delaware0.3
  2. Colorado0.3
  3. Iowa0.2
  4. California0.2
  5. Kansas0.2
  6. Connecticut0.2
  7. 50 states and D.C.0.1

Source: CMS NPPES, primary taxonomy 1744R1102X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.

3.7% of these records appear in a Medicare file, against 4.3% 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. California3.7%
  2. United States4.3%

Research Study Specialist records in California, measured

  • In a Medicare file3 of 82 · 3.7% here, 4.3% nationally
  • In the CMS Doctors and Clinicians file1 · 1.2% here, 0.9% nationally
  • Not updated in five years or more43 · 52.4% here, 66.7% nationally

Source: CMS NPPES, file of Aug 9, 2026 (primary taxonomy 1744R1102X); CMS Medicare Part D Prescribers 2024, MIPS 2023, Open Payments 2024 and Doctors and Clinicians, matched by NPI.

What the count covers

82 NPPES records list research study specialist (1744R1102X) as their primary taxonomy with a practice address in California: 0.2 per 100,000 residents against 0.1 nationally (50 states and D.C.). Los Angeles has 8 of them (10%).

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. Florida33
  2. Texas33
  3. Maryland31
  4. Massachusetts25

States with a similar rate per 100,000

  1. Colorado0.3
  2. Missouri0.2
  3. Arizona0.1
  4. North Carolina0.1

The largest states

  1. Florida33
  2. Texas33
  3. Maryland31
  4. Massachusetts25
  5. New York25

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.