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 47 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. Hana Chakalian, DOVentura, CA 930031962145631
  2. Anindita Chakrabarti, M.D.San Francisco, CA 941171649446345
  3. Rinita ChakrapaniSacramento, CA 958171134573561
  4. Eesha Chakravartty, MDTarzana, CA 913561437640950
  5. Yervand Chakryan, DO, MSLos Angeles, CA 900891386878908
  6. Sridevi ChallaMilpitas, CA 950351285981803
  7. Catherine Challender, MD, MPHLa Jolla, CA 920371336567866
  8. Alisa ChalmersLos Angeles, CA 900171801327333
  9. Edward Chamberlain, M.D.San Diego, CA 921221457336349
  10. Brett Chamberlin, M.D.Oceanside, CA 920551134323934
  11. Joseph Chambers, MD.Mission Hills, CA 913451467435297
  12. Julia ChambersSan Francisco, CA 941151952938102
  13. Michael Chambers, M.D.Chula Vista, CA 919101740298843
  14. Nefissa Chambi, M.D.Union City, CA 945871730157157
  15. Gabriel Chamie, MDSan Francisco, CA 941101548335276
  16. Lynne Champagne, MDSan Diego, CA 921281952412181
  17. Philippe Champagne, M.D.Los Angeles, CA 900951053632430
  18. Alex Chan, DOSan Diego, CA 921201073931630
  19. Alexander Chan, MDAlhambra, CA 918011467413666
  20. Alexander Chan, M.D.Stockton, CA 952191386722296
  21. Andy Chan, DOSan Diego, CA 921031104480912
  22. Angela Chan, M.DBell Gardens, CA 902011649441338
  23. Angela Chan, MDAlameda, CA 945011205909512
  24. Bobby Chan, M.D.Loma Linda, CA 923571265549497
  25. Brian Chan, MDRichmond, CA 948011437234754
  26. Charlie ChanEl Monte, CA 917311396857348
  27. Choon-Weng Chan, M.D.Elk Grove, CA 957571528088937
  28. Chun Hin Chan, MDSanta Monica, CA 904041861922999
  29. Chung-Wei Chan, M.D.Sunnyvale, CA 940891972820793
  30. Clayton Chan, MDOakland, CA 946071972682037
  31. Curtis ChanSan Francisco, CA 752011154418895
  32. David Chan, M.D.Loma Linda, CA 923541982944005
  33. David Chan, MDSanta Rosa, CA 954031972132546
  34. Emmeline Chan, M.DLos Angeles, CA 900231841636784
  35. Garrett Chan, MDFremont, CA 945381629728449
  36. Gary Chan, M.D.San Francisco, CA 941091699702324
  37. Hon Chan, M.D.Vacaville, CA 956881265529549
  38. Jay Chan, DOPalo Alto, CA 943011982284550
  39. John Chan, MDTorrance, CA 905051841503125
  40. Joshua Chan, DO, MSOrange, CA 928681689317588
  41. Ka Kam Chan, M.D.San Francisco, CA 941091356453815
  42. Karl Chan, MDSouth San Francisco, CA 940801194897942
  43. Kaylund Chan, MDFremont, CA 945381407090152
  44. Kenneth Chan, M.D.San Gabriel, CA 917761861422370
  45. Kenneth Chan, MDSan Francisco, CA 941331912091919
  46. Kenneth Chan, MDRoseville, CA 956611780762435
  47. Khaled Chan, MDWestminster, CA 926831255376414
  48. Kimberley Chan, MDLos Angeles, CA 900491588763585
  49. Kimberly Chan, M.DLos Angeles, CA 900121295166692
  50. Kwok Chan, M.D.San Francisco, CA 941171063413714

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.