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 226 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. Tan Nguyen, MDSunnyvale, CA 940861003256843
  2. Teneese Nguyen, MD.Laguna Hills, CA 926531043306673
  3. Thai Nguyen, M.D.Santa Ana, CA 927031467547042
  4. Thai NguyenOakland, CA 946091295361343
  5. Thai Nguyen, MDRedding, CA 960011740808815
  6. Than Nguyen, D.O.Berkeley, CA 947051316207236
  7. Thang Nguyen, MDSun City, CA 925861013916048
  8. Thanh NguyenMurrieta, CA 925631497506307
  9. Thanh Trang Nguyen, MDPlacerville, CA 956671497907083
  10. Theodore Nguyen, MDLoma Linda, CA 923541104484781
  11. Theodore Nguyen, MDAnaheim, CA 928071962573907
  12. Theresa Thanh Nguyen, M.D.Santa Ana, CA 927031003893801
  13. Thien Nguyen, DOPalm Springs, CA 922621023470671
  14. Thieu Nguyen, M.D.Porterville, CA 932571720469919
  15. Thinh Nguyen, M.D.San Jose, CA 951211073759163
  16. Thomas Nguyen, MDSan Luis Obispo, CA 934011336272871
  17. Thuan NguyenLos Angeles, CA 900171982086898
  18. Thuy Nguyen, M.D.Westminster, CA 926831811077787
  19. Thuy Trang NguyenVentura, CA 930031326579822
  20. Thuytrang Nguyen, M.D.San Juan Capistrano, CA 926751861537656
  21. Thuyvan Nguyen, D.O.Riverside, CA 925071275859233
  22. Tiffany Nguyen, M.D.Garden Grove, CA 928401770840530
  23. Tin Nguyen, MDFontana, CA 923351386703908
  24. Tram Nguyen, M.D.San Leandro, CA 945771992061527
  25. Trang Nguyen, D.O.Wildomar, CA 925951861836207
  26. Trang Nguyen, MDAnaheim, CA 928071932257904
  27. Trang Nguyen, M.D.Milpitas, CA 950351053324459
  28. Tranhoai Nguyen, M.D.Riverside, CA 925051558411439
  29. Tri Nguyen, D.O.West Hollywood, CA 900481528599776
  30. Truclinh Nguyen, D.O.Loma Linda, CA 923541134385685
  31. Tu Nguyen, MDWestminster, CA 926831740217942
  32. Tuan Nguyen, MDAnaheim, CA 928071649341629
  33. Tuan Nguyen, MDSan Jose, CA 951161265530216
  34. Tuan Xuan Nguyen, MDGarden Grove, CA 928431679519821
  35. Tue Nguyen, MDSan Diego, CA 921151548226178
  36. Tung Nguyen, MDFresno, CA 937201881772788
  37. Tung Nguyen, MDSan Francisco, CA 941431003871724
  38. VI Nguyen, MDSylmar, CA 913421316697519
  39. Vi-Van NguyenSan Diego, CA 921031942901079
  40. Victor Nguyen, MDMurrieta, CA 925631144330051
  41. Viet Nguyen, D.O.Irvine, CA 926181770528515
  42. Vincent Nguyen, DOScotts Valley, CA 950661285212704
  43. Vinh Nguyen, MDEl Monte, CA 917331972668291
  44. Vinh Nguyen, M.D.San Jose, CA 951161720086556
  45. Vivian Nguyen, MDWestminster, CA 926831689869570
  46. Vu NguyenLoma Linda, CA 923541154884583
  47. Vu Nguyen, MDSan Jose, CA 951161669568135
  48. Vu Nguyen, MDSacramento, CA 958251013595156
  49. Vuong Nguyen, M.D.Westminster, CA 926831093701690
  50. Vy Nguyen, M.D.Mission Viejo, CA 926911881671154

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.