NPPES file of Aug 9, 2026

Internal Medicine Physician in California

17,696 NPPES records list internal medicine physician with a practice address in California, 45 per 100,000 residents, the 17th highest rate of 51. Los Angeles and San Francisco have the most; each record links to the provider's NPI and the California license search. Page 227 of 354.

CMS NPPES registry, file of Aug 9, 2026; 2023 Census estimates · NUCC 207R00000X · 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, 1,423

  1. Los Angeles1,423
  2. San Francisco1,318
  3. San Diego961
  4. Sacramento601
  5. Oakland432

Internal Medicine Physician records in California

  1. William Nguyen, M.D.Orange, CA 928681043424575
  2. Yen Nguyen, M.D.Oakland, CA 946111063614147
  3. Ythanh Nguyen, MDRancho Cucamonga, CA 917301255391181
  4. Peter Nguyen-Dang, MDWestminster, CA 926831710449822
  5. Nha-Ai Nguyen-Duc, M.D.San Jose, CA 951191053322727
  6. Jadzia Nguyen-Khoa, DOSan Diego, CA 921031265026454
  7. Chau Nguyen-Thio, MDEastvale, CA 928801225010135
  8. Ann Nguyen-Traxler, M.D.Berkeley, CA 947101376770933
  9. Paul Nguyenfa, MDLos Angeles, CA 900951831535749
  10. Jie Ni, MDDaly City, CA 940151538247127
  11. Michael Niaki, M.D.San Leandro, CA 945771457512360
  12. Enayatullah Niazi, MDSacramento, CA 958231609404748
  13. Yasmin Nibbe, MDSan Rafael, CA 949031831226794
  14. Edward Nichols, M.D.Bakersfield, CA 933011558372896
  15. Gary Nichols, M.D.Santa Rosa, CA 954051033201587
  16. Stephen Nichols, MDMountain View, CA 940401275540437
  17. Zachary Nichols, DOSonora, CA 953701538658752
  18. Dean Nickles, MDEmeryville, CA 946081255390050
  19. Harris Nickowitz, MDWest Hollywood, CA 900481588280135
  20. Madonna Nicolai, CFNPTustin, CA 927801164648556
  21. Kristine Nicolas, MDRiverside, CA 925091851605554
  22. Zetan Nie, M.D., PH.D.Monterey Park, CA 917541477554905
  23. Glenn Niegas, D.O.Trabuco Canyon, CA 926791912157645
  24. Brian Nielsen, DOColton, CA 923241710143573
  25. Donald Nielsen, MDAlamo, CA 945071992686075
  26. Kristin Nielsen, MDRedwood City, CA 940621831100080
  27. Virgil Nielsen, MDRiverside, CA 925051487713087
  28. Matthew Nienaber, D.O.Santa Monica, CA 904031033535182
  29. Michael Nierenberg, MDPalo Alto, CA 943061790834133
  30. Andres Nieto, M.D.San Francisco, CA 941111740342492
  31. Elizabeth Nieto, M.D.Mission Viejo, CA 926911689020760
  32. Laura Nieves, MDCorona, CA 928791073808994
  33. Nishita NigamSan Jose, CA 951161093244774
  34. Robert Niihara, MDLoma Linda, CA 923541831889237
  35. Jessica Nijmeh, M.D.San Jose, CA 951191174728091
  36. Daniel Niknam, DOInglewood, CA 903011598262073
  37. Shanti Nilakantan, MDLong Beach, CA 908151902805898
  38. Soodeh Nili, M.DWest Hills, CA 913071942590542
  39. David Nilsson, PA CBakersfield, CA 933091841227162
  40. Jayshri Nimbargi, MDModesto, CA 953501851532261
  41. Stephen Nimelstein, MDSan Francisco, CA 941431326086661
  42. Bhoomin Nimitsilpa, MDDowney, CA 902421235206103
  43. John Ning, MDSacramento, CA 958171700382272
  44. Sitara NiranjanSacramento, CA 958171740928365
  45. Varalakshmi Niranjan, MDStanford, CA 943051043317340
  46. Robert Nisenbaum, M.D.Los Angeles, CA 900671295732154
  47. Oleg Nisenberg, MD, PHDLoma Linda, CA 923541255541058
  48. Joy Nishime, MDSan Jose, CA 951121083663736
  49. Kevin Nishimori, MDWoodland Hills, CA 913671548329162
  50. Mitchell Nishimoto, M.D.Van Nuys, CA 914051003917287

Source: CMS NPPES, primary taxonomy 207R00000X: records by practice city and the list of records, file of Aug 9, 2026.

California ranks 17 of 51 per resident

  1. New Jersey50
  2. New Hampshire48
  3. Minnesota46
  4. California45
  5. Florida45
  6. Ohio45
  7. 50 states and D.C.44

Source: CMS NPPES, primary taxonomy 207R00000X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.

79.5% of these records appear in a Medicare file, against 78.7% 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. California79.5%
  2. United States78.7%

Internal Medicine Physician records in California, measured

  • In a Medicare file14,068 of 17,696 · 79.5% here, 78.7% nationally
  • In the CMS Doctors and Clinicians file11,077 · 62.6% here, 61.4% nationally
  • Not updated in five years or more10,832 · 61.2% here, 55.4% nationally
  • Median graduation year2004 · the 11,065 records with a school on file

Source: CMS NPPES, file of Aug 9, 2026 (primary taxonomy 207R00000X); CMS Medicare Part D Prescribers 2024, MIPS 2023, Open Payments 2024 and Doctors and Clinicians, matched by NPI.

What the count covers

17,696 NPPES records list internal medicine physician (207R00000X) as their primary taxonomy with a practice address in California: 45 per 100,000 residents against 44 nationally (50 states and D.C.). Los Angeles has 1,423 of them (8%).

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 York12,067
  2. Florida10,151
  3. Texas9,175
  4. Pennsylvania7,300

States with a similar rate per 100,000

  1. Minnesota45.9
  2. Ohio44.8
  3. New Hampshire48.0
  4. Maine42.8

The largest states

  1. New York12,067
  2. Florida10,151
  3. Texas9,175
  4. Pennsylvania7,300
  5. Illinois7,238

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.