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 225 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. Minh Nguyen, MDLong Beach, CA 908131922160613
  2. Minh Nguyen, M.D.La Jolla, CA 920371952353351
  3. Minh Nguyen, M.D.San Marcos, CA 920781154403640
  4. Minhchau Nguyen, M.D.San Jose, CA 951281578729232
  5. Mychi Nguyen, M.D.Oakland, CA 946061366615163
  6. Nathan Nguyen, M.D.Walnut Creek, CA 945961861636615
  7. Nga Nguyen, M.D.Garden Grove, CA 928401346447984
  8. Ngocbich Nguyen, MDSan Diego, CA 921031578663787
  9. Nguyen Nguyen, M.D.San Diego, CA 921231508800202
  10. Nguyen Nguyen, M.D.Fountain Valley, CA 927081447661889
  11. Nguyen Nguyen, DOSan Jose, CA 951281699302372
  12. Nguyen NguyenSan Jose, CA 951281225732480
  13. Nhan Nguyen, M.D.Garden Grove, CA 928431528248770
  14. Nhi Nguyen, MDStanford, CA 943051407318009
  15. Nicholas Nguyen, MDRiverside, CA 925051548329147
  16. Nicolas Nguyen, MDSan Jose, CA 951191851463673
  17. Nicole Nguyen, M.D.Torrance, CA 905051336482207
  18. Niem Nguyen, M.D.Anaheim, CA 928011669429957
  19. Oliver Nguyen, MDBellflower, CA 907061356418289
  20. Philippe Nguyen, MDSan Francisco, CA 941091821160573
  21. Phuc Nguyen, M.D.Westminster, CA 926831134123961
  22. Phuong Nguyen, DOSierra Madre, CA 910241336609908
  23. Phuong Nguyen, DOPanorama City, CA 914021205494283
  24. Que Nguyen, MDBaldwin Park, CA 917061851462758
  25. Quoc Nguyen, M.D., M.P.HBrea, CA 928211043240450
  26. Quoc Nguyen, DOAntioch, CA 945311275611386
  27. Quy Nguyen, MDRosemead, CA 917701366400145
  28. Quy Nguyen, M.D.Santa Ana, CA 927061033289699
  29. Quynam Nguyen, M.D.Los Angeles, CA 900231255452454
  30. Quynh Nguyen, MDAlameda, CA 945011447338231
  31. Quynh Giao Nguyen, DOSan Diego, CA 921031467912600
  32. Quynh-Giao Nguyen, MDSan Diego, CA 921611700857810
  33. Richard Nguyen, M.D.Oxnard, CA 930301699960708
  34. Robert Nguyen, MDColton, CA 923241144256900
  35. Robert Nguyen, MDOxnard, CA 930301780775718
  36. Robert Nguyen, MDMadera, CA 936371780660704
  37. Sabine Nguyen, DOCompton, CA 902221831515659
  38. Saundra NguyenSan Francisco, CA 941431902337850
  39. Sheila Nguyen, MDFountain Valley, CA 927081033435987
  40. Son Nguyen, M.D.Long Beach, CA 908071811285422
  41. Son Nguyen, M.D.Huntington Beach, CA 926481215941778
  42. Son Nguyen, M.D.Fairfield, CA 945331114119526
  43. Sonha NguyenSan Diego, CA 921211275066870
  44. Stanley NguyenFountain Valley, CA 927081164954145
  45. Stephen Nguyen, MDSun City, CA 925861619976644
  46. Susan Nguyen, MDSan Francisco, CA 941151164470696
  47. Tam Nguyen, M.D.Garden Grove, CA 928401720153182
  48. Tam Nguyen, D.O.San Jose, CA 951161962520478
  49. Tam Nguyen, D.O.Marysville, CA 959011841200854
  50. Tan Nguyen, M.D.Garden Grove, CA 928401609839299

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.