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 222 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. Karry Ngai, M.D.Santa Clara, CA 950511982899381
  2. George Ngan, MDLos Angeles, CA 900571316054174
  3. Lillian Ngaw, M.D.Pasadena, CA 911011154373538
  4. Justine Nghiem, MDSalinas, CA 939011962550491
  5. Chau Ngo, M.D.Laguna Beach, CA 926511477613339
  6. Cuong Ngo, MDWestminster, CA 926831285760850
  7. Dean Ngo, MDWestminster, CA 926831982690582
  8. Eric Ngo, MDFontana, CA 923351437207339
  9. Harrison Ngo, MDLos Angeles, CA 900731922740554
  10. Huy NgoSan Jose, CA 951281508183328
  11. Hy Ngo, MDSan Gabriel, CA 917761871658492
  12. Jennifer Ngo, DOMarch Air Reserve Base, CA 925181588160253
  13. Loan Ngo, M.D.Westminster, CA 926831386696144
  14. Loan Ngo, MDSan Francisco, CA 941151467500744
  15. Lynda Ngo, M.D.Cerritos, CA 907031053732636
  16. Lynn Ngo, MDStanford, CA 943051659303907
  17. Phat Ngo, MDLoma Linda, CA 923571619938305
  18. Tan Ngo, M.D.Westminster, CA 926831770503997
  19. Thong Ngo, DOCorona, CA 928791134706757
  20. Timothy Ngo, MDSacramento, CA 958231780756502
  21. Tin Ngo, MDSan Francisco, CA 941091114676244
  22. Tung Ngo, DOIrvine, CA 926181104095256
  23. Vinh Ngo, M.D.Long Beach, CA 908221134232366
  24. Vivian NgoArcadia, CA 910061063041267
  25. Whitney NgoRancho Mission Viejo, CA 926941497405112
  26. Quyen Ngo-Metzger, MDOrange, CA 928681306926571
  27. Max Jordan Nguemeni TiakoLos Angeles, CA 900951124601513
  28. Michael Ngumi, MDSan Jose, CA 951281124524673
  29. Aileen Nguyen, MDBurlingame, CA 940101861996332
  30. Alexie Nguyen, M.D.Encinitas, CA 920241659367613
  31. An Nguyen, MDBellflower, CA 907061821146705
  32. Andy Nguyen, D.O.Encinitas, CA 920241053748459
  33. Andy Nguyen, MDLivermore, CA 945511659450310
  34. Anh Nguyen, MDPomona, CA 917691942247192
  35. Anhtuan Nguyen, MDWestminster, CA 926831386698660
  36. Anphong NguyenTempleton, CA 934651962065920
  37. Anthony Nguyen, M.D.Cerritos, CA 907031891053351
  38. Anthony Nguyen, MDWoodland Hills, CA 913671821162736
  39. Bao Nguyen, M.D.Fresno, CA 937301588673024
  40. Bien Nguyen, MDSan Jose, CA 951191013093525
  41. Boichuyen Nguyen, MDAnaheim, CA 928071679621452
  42. Brandon NguyenFresno, CA 937011326730300
  43. Brian Nguyen, M.D.Sun City, CA 925861851314512
  44. Cam Tu Nguyen, MDWest Hollywood, CA 900481093027559
  45. Cecilia Nguyen, BSLos Angeles, CA 900951861194078
  46. Chibao Nguyen, D.O.Covina, CA 917231528370830
  47. Christine Nguyen, MDVista, CA 920811750483590
  48. Christine Nguyen, M.D.Menifee, CA 925861114947405
  49. Christopher Nguyen, DOLoma Linda, CA 923541508205592
  50. Christopher Nguyen, MDSan Francisco, CA 944101538271648

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.