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 342 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. Assefa Worku, MDSan Jose, CA 951191003127986
  2. Samuel Wosk, M.D.Los Angeles, CA 900231689604951
  3. Manjulika Woytowitz, M.D.San Diego, CA 921611669584769
  4. David Wright, M.D.Pacific Grove, CA 939501821327248
  5. Francis Wright, MDOakland, CA 946111194467753
  6. Peter Wroblicky, M.D.Mather, CA 956551881895928
  7. Arthur Wu, MDSan Jose, CA 951281053593202
  8. Bie-Chin Wu, M.D.Torrance, CA 905051235325317
  9. Chengcong Wu, M.D.Diamond Bar, CA 917651407810666
  10. Chien-Ko Wu, M.D.Orange, CA 928671275680829
  11. Chou Wu, MDElk Grove, CA 957581548228109
  12. Christina Wu, MDSan Diego, CA 921031912431065
  13. Christina Wu, M.D.Union City, CA 945871790837920
  14. Constance Wu, MDSan Francisco, CA 941431447837661
  15. Davy WuSan Francisco, CA 941101447356795
  16. Derrina Wu, M.D.San Francisco, CA 941181659387892
  17. Frederick Wu, MDSan Diego, CA 921031558578195
  18. Heidi Wu, M.D.Beverly Hills, CA 902111326042136
  19. Hong Wu, M.D.Berkeley, CA 947101386653657
  20. Hueyyuan Wu, M.D.Alhambra, CA 918011093778672
  21. Jack Wu, M.D.Long Beach, CA 908071326089079
  22. Jeffrey Wu, D.O.Long Beach, CA 908061790198786
  23. Jerwin Wu, MDSan Jose, CA 951281346238854
  24. Jim Wu, MDYucca Valley, CA 922841285605014
  25. Jimmy Wu, M.D.Garden Grove, CA 928401982647939
  26. Jing-Fun Wu, MDOakland, CA 946111093911299
  27. John Wu, MDSan Francisco, CA 941081619099272
  28. Johnny WuLos Angeles, CA 900121912468414
  29. Johnny Wu, MDFullerton, CA 928351801356290
  30. Jonathan Wu, DOAlhambra, CA 918011558922245
  31. Julie Wu, MDRedwood City, CA 940631568540102
  32. Justin Wu, D.O.La Palma, CA 906231174824841
  33. Kesheng Wu, MDWhittier, CA 906051932119385
  34. Kester Wu, DOBaldwin Park, CA 917061609253699
  35. Kevin Wu, MDPanorama City, CA 914021912207242
  36. Lauren Wu, MDSan Francisco, CA 941151114055563
  37. Leslie Wu, MDSan Francisco, CA 941101750941050
  38. Louis Wu, M.D.Berkeley, CA 947051669587150
  39. Melissa Wu, M.D.Los Gatos, CA 950321053585331
  40. Michelle Ka Yan Wu, M.D.San Jose, CA 951281598405813
  41. Min- Shung Wu, M.D.Visalia, CA 932911174616684
  42. Muzo Wu, MD, MS, SCDFresno, CA 937211033564943
  43. Patrick WuLoma Linda, CA 923541124448378
  44. Pearl Wu, MDRedwood City, CA 940631043362015
  45. Ryan Wu, MDLivermore, CA 945511598843641
  46. Samuel Wu, M.D.,PH.D.Gilroy, CA 950201659329993
  47. Shin-Shen Wu, M.D.Irvine, CA 926201962411066
  48. Shirley Wu, M.D.Sacramento, CA 958171215103072
  49. Simon Wu, M.D.Los Angeles, CA 900731316297815
  50. Tai Wu, MDSan Gabriel, CA 917761417963661

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.