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 53 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. Chung-Ying Chen, MDSunnyvale, CA 940861457436081
  2. Chwen-Yuen Chen, MDStanford, CA 943051114100476
  3. Connie Chen, M.D.Stanford, CA 943051144586199
  4. David Chen, MDDowney, CA 902411295315489
  5. Donald Chen, MDBellflower, CA 907061497822381
  6. Doris Chen, MDStanford, CA 943051013273283
  7. Flora Chen, MDBurlingame, CA 940101417034349
  8. Gilbert Chen, MDColton, CA 923241013479120
  9. Gina Chen, MDFremont, CA 945381700961026
  10. Han-Cheng ChenSan Francisco, CA 941101912387796
  11. Harrison Chen, DOArcadia, CA 910071841829793
  12. Hongwei Chen, M.D.Clovis, CA 936191881879617
  13. Howard Chen, DOChino, CA 917101699968339
  14. Ihong Chen, MDFountain Valley, CA 927081104822535
  15. Iling Chen, MDSan Francisco, CA 941161043350143
  16. Ingrid Chen, M.D.Arcadia, CA 910061154572402
  17. James Chen, M.D.San Diego, CA 921281265495691
  18. James Chen, M.D.Belmont, CA 940021164531141
  19. James ChenFolsom, CA 956301568447266
  20. Jaw-Huei Chen, MDHacienda Heights, CA 917451194885384
  21. Jeffrey Chen, D.O.Bakersfield, CA 933091952749186
  22. Jenna ChenOakland, CA 946021689294001
  23. Jennifer Chen, MD, MPHSylmar, CA 913421710056585
  24. Jennifer Chen, MDSan Gabriel, CA 917761548335516
  25. Jenny Chen, M.D.Sacramento, CA 958171295885150
  26. Jesse Chen, DOOak Park, CA 913771902390990
  27. Jessica Chen, MDLa Jolla, CA 920371730264284
  28. Ji Chen, M.D.Berkeley, CA 947021386685444
  29. Jian Chen, M.D.Santa Paula, CA 930601679568612
  30. Joanna Chen, MDBaldwin Park, CA 917061851463335
  31. Jonathan Chen, MD, PHDStanford, CA 943051619268372
  32. Joyce Chen, MDPalo Alto, CA 943041518054873
  33. Judy Chen, MDLos Angeles, CA 900951548294846
  34. Julie Chen, M.D.San Jose, CA 951281407045412
  35. Kai-Ey Chen, M.D.Sacramento, CA 958161952418253
  36. Katherine Chen, M.D.Los Angeles, CA 900951275928525
  37. Katherine ChenOakland, CA 946111780927491
  38. Kelvin Chen, MDRosemead, CA 917701225387137
  39. Kenneth ChenPasadena, CA 911051265689442
  40. Kenny Chen, M.D.Mountain View, CA 940401649332743
  41. Kevin Chen, M.D.East Los Angeles, CA 900221356787576
  42. Kevin Chen, M.D.Oakland, CA 946091235300658
  43. Kuancheng Chen, MDArcadia, CA 910071235125790
  44. Lauren Chen, MDOrange, CA 928681861029001
  45. Lih-Jiau Chen, MDFontana, CA 923351033268396
  46. Lillian Chen, M.D.Torrance, CA 905051386919454
  47. Lily Chen, DOSan Jose, CA 951161164107991
  48. Lisa Chen, MDSan Francisco, CA 941101467468611
  49. Loren Chen, M.D.Panorama City, CA 914021972581643
  50. Man-Chun Chen, M.D.Los Angeles, CA 900121780909838

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.