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 223 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. Chuan Nguyen, M.D.Anaheim, CA 928011144328303
  2. Cindy NguyenLos Angeles, CA 900951417319054
  3. Cong Nguyen, MDSan Jose, CA 951191730412107
  4. Cristina NguyenPasadena, CA 911051396278115
  5. Cu Nguyen, MDPismo Beach, CA 934491669534236
  6. Cuong Nguyen, MDMoreno Valley, CA 925531437141660
  7. Cuong Nguyen, MDWestminster, CA 926831689625451
  8. Dan Nguyen, DOHarbor City, CA 907101508918962
  9. Dan-Vinh Nguyen, M.D.Sacramento, CA 958171932425261
  10. Danny Nguyen, D.OWildomar, CA 925951073046926
  11. Dao Nguyen, MDWestminster, CA 926831811948680
  12. Dat Nguyen, MDHawthorne, CA 902501720092315
  13. Dat Nguyen, M.D.Westminster, CA 926831871730895
  14. David Nguyen, M.D.Long Beach, CA 908071932425683
  15. David Nguyen, D.O.Rosemead, CA 917701316017353
  16. David Nguyen, MDSun City, CA 925861780683714
  17. David Vinh-Phuc Nguyen, MDSan Diego, CA 921111538656137
  18. Derek Nguyen, MDRiverside, CA 925011528054095
  19. Derek Nguyen, MDSan Francisco, CA 941091306422399
  20. Diana Nguyen, M.D.Dublin, CA 945681922379288
  21. Diana Nguyen, M.D.Sacramento, CA 958171710340492
  22. Dieu Thu Nguyen, MDSan Fernando, CA 913401720013105
  23. Don Nguyen, D.O.Folsom, CA 956301356311427
  24. Donna Nguyen, MDAnaheim, CA 928011902038078
  25. Duc Nguyen, MDFontana, CA 923351508933433
  26. Duc Nguyen, M.D.Oceano, CA 934451255366928
  27. Elizabeth Nguyen, MDCamarillo, CA 930101770528028
  28. Emily Nguyen, DOTorrance, CA 905021083812028
  29. Ethan Nguyen, MDVista, CA 920831568475614
  30. Gina Nguyen, M.D.Newport Beach, CA 926631619265022
  31. Giulianna Nguyen, M.D.Torrance, CA 905011538302815
  32. Hai Nguyen, M.D.Santa Ana, CA 927061558516963
  33. Han Nguyen, MDBellflower, CA 907061518034420
  34. Hanh Nguyen, MDSan Francisco, CA 941151497833081
  35. Hanh Nguyen, MDSan Jose, CA 951221730144437
  36. Hau Nguyen, M.D.Fresno, CA 937031326306994
  37. Henry Hao Nguyen, D.O.Downey, CA 902421669713780
  38. Hiep Nguyen, M.D.San Diego, CA 921151184716151
  39. Hiep Nguyen, MDBerkeley, CA 947101588612881
  40. Hoa Nguyen, M.D.La Mirada, CA 906381508897158
  41. Hoa Nguyen, MD.Loma Linda, CA 923571770633117
  42. Hoa Nguyen, M.D.Irvine, CA 926181427285394
  43. Hoa Nguyen, M.DWestminster, CA 926831619931763
  44. Hoan Nguyen, M.D.Chino, CA 917101952591653
  45. Hoang Nguyen, M.D.Fountain Valley, CA 927081457329179
  46. Hoang Anh Nguyen, DOSylmar, CA 913421457971749
  47. Hoanglong Nguyen, MDSylmar, CA 913421164715736
  48. Hong Phuc Nguyen, DOLancaster, CA 935341992995997
  49. Huan Nguyen, M.D.Los Angeles, CA 900121841224474
  50. Hung Nguyen, MDLong Beach, CA 908221104823970

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.