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 348 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. Suzanne Yokoyama, MDSan Jose, CA 951191992833891
  2. Rukiye Yoltar, MDPetaluma, CA 949541952485922
  3. Glenn Yoneda, MDSalinas, CA 939011669456786
  4. Emily Yong, MDSan Francisco, CA 941331477631083
  5. Heather Yong, M.D.Anaheim, CA 928011457546343
  6. John Yong, M.D.Los Angeles, CA 900171225062706
  7. Sabrina Yong, MDArcadia, CA 910071922360205
  8. Jose Yongco, M.D.Santa Maria, CA 934551114941218
  9. Jae Yoo, MDLos Angeles, CA 900061295811966
  10. Jennifer Yoo, DOMilpitas, CA 950351275235236
  11. Jennifer Yoo, MDSan Jose, CA 951281669565321
  12. Mary Yoo, MDSan Diego, CA 921201609935212
  13. Si-Eup Yoo, MDMission Hills, CA 913451205855673
  14. Sun Yoo, M.D., M.P.H.Los Angeles, CA 900951265875488
  15. Aeree Yoon, MDTorrance, CA 905031679574206
  16. Eun Yoon, M.D.Los Angeles, CA 900061821091661
  17. Jessica Yoon, M.D.West Hollywood, CA 900481659650836
  18. Joon Yoon, M.D.Los Angeles, CA 900121093984437
  19. Kristopher Yoon, M.D.Santa Monica, CA 904041760800676
  20. Stephen Yoon, M.D.Fullerton, CA 928351851327100
  21. Naaiko Yorichika, MDPalmdale, CA 935521821748393
  22. Steven YorkNorthridge, CA 913251124035894
  23. Joseph Yorke, M.D.Santa Maria, CA 934581811929516
  24. Gene Yoshikawa, MDTorrance, CA 905021710447628
  25. Thomas Yoshikawa, M.D.Los Angeles, CA 900591912070467
  26. Shandra Yoshimi, MDSouth San Francisco, CA 940801396823977
  27. Hanna Yoshino, M.D.Woodland Hills, CA 913671588691836
  28. Susan Yoshino, D.O.Riverside, CA 925041750493516
  29. Steve Yoshioka, MDSan Jose, CA 951281467642520
  30. James Yoss, M.D.San Francisco, CA 941171932107109
  31. Kareem Yostos, DOLompoc, CA 934361568475077
  32. Adrienne Youdim, MDLos Angeles, CA 900481083782973
  33. Katrin Youdim, MDWoodland Hills, CA 913671033258728
  34. Yeo Youn, MDFontana, CA 923351497822498
  35. Nastaran Younessi, MDWoodland Hills, CA 913671285786640
  36. Shawn YounessiTarzana, CA 913561629503842
  37. Anne YoungOakland, CA 946021710540836
  38. Daniel Young, MDWalnut Creek, CA 945961942388004
  39. Douglas Young, MDSacramento, CA 958211346340296
  40. Ellen Young, MDBakersfield, CA 933011235178310
  41. Emily Young, MDSacramento, CA 958171124655584
  42. Gabriel Young, M.D.Cupertino, CA 950141811084114
  43. Grace Young, MDAnaheim, CA 928011114015369
  44. Hannah Young, MDSan Diego, CA 921231073073243
  45. Howard Young, MDTemple City, CA 917801386751899
  46. Howard Young, MDStockton, CA 952101174602205
  47. Jeffrey Young, DOIrvine, CA 926041942707344
  48. Joseph Young, MDOakland, CA 946111366520157
  49. Justine Young, D.O., MPHMontebello, CA 906401104265677
  50. Karlyn Young, MDSanta Rosa, CA 954031629394598

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.