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 224 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. Hung Nguyen, MDWestminster, CA 926831619921095
  2. Hung Nguyen, M.D.Garden Grove, CA 928431538181763
  3. Hung Nguyen, MDVisalia, CA 932911740379312
  4. Hung-Anh Nguyen, MDSacramento, CA 958231871594036
  5. Huong Nguyen, M.D.Corona, CA 928791992199343
  6. Huu Nguyen, M.D.Santa Ana, CA 927071396922068
  7. Huu Nguyen, D.O.Walnut Creek, CA 945961811966492
  8. Isabelle Nguyen, MDSan Francisco, CA 941091154920833
  9. J Duc Nguyen, M.D.Fontana, CA 923351427018456
  10. Jacqueline Nguyen, DOSylmar, CA 913421730874306
  11. Jacquelyn Nguyen, M.D.Los Angeles, CA 900641982855417
  12. Jamie Nguyen, MDSan Jose, CA 951111053442020
  13. Jan Nguyen, D.O.Long Beach, CA 908061477915452
  14. Jasmine Nguyen, DODowney, CA 902421952989667
  15. Jennifer Nguyen, MDLos Angeles, CA 900271417261090
  16. Jennifer Nguyen, MDBellflower, CA 907061013065846
  17. Joe Nguyen, M.D.Mission Viejo, CA 926911740361187
  18. John Nguyen, M.D.Crockett, CA 945251902868359
  19. Jonathan NguyenLong Beach, CA 908061023193125
  20. Jonathan Nguyen, M.D.Walnut Creek, CA 945961922549138
  21. Julie Nguyen, MDSunnyvale, CA 940861619618501
  22. Julie Nguyen, MDVacaville, CA 956881568059822
  23. Katherine NguyenWest Hills, CA 913041871235556
  24. Kevin Nguyen, MDOakland, CA 946111114955077
  25. Khai Nguyen, M.D., M.H.S.La Jolla, CA 920371104067230
  26. Khang Nguyen, M.D.Long Beach, CA 908061245203074
  27. Khoa Nguyen, M.D.San Diego, CA 921231043253958
  28. Khoa Nguyen, M.D.Castro Valley, CA 945461386962421
  29. Khoa Nguyen, MDSan Jose, CA 951191235203555
  30. Khoi Nguyen, MDHarbor City, CA 907101720136526
  31. Kim NguyenCorcoran, CA 932121194925552
  32. Kim Nguyen, M.D.Berkeley, CA 947031588920268
  33. Kim Dung Nguyen, MDLos Angeles, CA 900271821261694
  34. Kimberly Nguyen, M.D.La Mesa, CA 919421558515239
  35. Lam Nguyen, M.D.Pico Rivera, CA 906601538594122
  36. Lan Nguyen, MDOrange, CA 928681669552832
  37. Laura Nguyen, MDBellflower, CA 907061306994330
  38. Lauren Nguyen, MDTorrance, CA 905051366191074
  39. Leigh Nguyen, M.D.Los Angeles, CA 900341720009095
  40. Linh Nguyen, MDSanta Cruz, CA 950601275761785
  41. Loc Nguyen, MDStockton, CA 952071962623462
  42. Long-Co Nguyen, M.D.West Hollywood, CA 900481194251561
  43. Longhang Nguyen, MDSunnyvale, CA 940871194894550
  44. Luu Nguyen, MDElk Grove, CA 957581417035148
  45. Mai Phuong Nguyen, MDFountain Valley, CA 927081265450266
  46. Michael Nguyen, DOLos Angeles, CA 900151902392665
  47. Michael Nguyen, MDAnaheim, CA 928071962550764
  48. Michael Nguyen, M.D.San Francisco, CA 941121972997070
  49. Michael Nguyen, MDManteca, CA 953371871671685
  50. Michelle-Linh Nguyen, MDGrass Valley, CA 959491114447596

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.