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 320 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. Carl Trygstad, M.D.Del Mar, CA 920141649370206
  2. Brett Trzcinski, MDSanta Barbara, CA 931051952807513
  3. Jacob Tsadok, MDLos Angeles, CA 900251881756096
  4. Anderson Tsai, D.O.Albany, CA 947061992065825
  5. Bernette Tsai, M.D.San Jose, CA 951281063686277
  6. Cindy Tsai, M.D.San Diego, CA 921011528472339
  7. Cynthia Tsai, MDStanford, CA 943051245735125
  8. Edward TsaiYorba Linda, CA 928861710227392
  9. Elizabeth Tsai, D.O.Tustin, CA 927801629284971
  10. Fausan Tsai, MDWalnut Creek, CA 945961285708123
  11. Henry Tsai, M.D.Irvine, CA 926971982772463
  12. Hsin Hsiang TsaiLos Angeles, CA 900951467030221
  13. Jane Tsai, M.D.Sacramento, CA 958161205840741
  14. Jerry Tsai, M.D.Orange, CA 928691083703565
  15. Katy Tsai, MDSan Francisco, CA 941431417275827
  16. Lester Tsai, MDSan Diego, CA 921031770080541
  17. Mark Tsai, M.D.Paramount, CA 907231225033111
  18. Matthew Tsai, MDStanford, CA 943051841866092
  19. Mon-Ta Tsai, M.D.Mission Viejo, CA 926911427019231
  20. Sandra Tsai, MDStanford, CA 943051083717359
  21. William Tsai, M.D.Irvine, CA 926121952356560
  22. Yuhjung TsaiSan Jose, CA 951191073651444
  23. Zonglang Tsai, M.D.Torrance, CA 905041871675744
  24. Aloyisus Tsang, M.D.Burbank, CA 915051891856340
  25. Lisa Tsang, M.D.Daly City, CA 940151871949347
  26. Luisa Tsang, MD MPHRichmond, CA 948011417623349
  27. Nally Tsang, M.D.Fremont, CA 945381487742003
  28. Nang Lok Ellick Tsang, M.D.San Francisco, CA 941101992873723
  29. William Tsang, MDSan Jose, CA 951191891871315
  30. Anthony Tsao, M.D.Oakland, CA 946111467634493
  31. Chialin Tsao, M.D.Berkeley, CA 947051942377916
  32. John Tsao, MDTorrance, CA 905051952377632
  33. Ronald Tsao, M.D.Redondo Beach, CA 902771770802746
  34. Cassidy Tsay, MDAnaheim, CA 928071508914409
  35. Chung Tse, MDStockton, CA 952101386796183
  36. Daniel Tse, MDSan Jose, CA 951161437258027
  37. Jonathan Tse, D.O.Mountain View, CA 940401346650637
  38. Wilson Tse, MDOakland, CA 946111467530246
  39. Caroline Tsen, MDSouth San Francisco, CA 940801902984545
  40. Daniel Tseng, MDSanta Clara, CA 950511336228071
  41. David Tseng, D.O.San Leandro, CA 945781699200709
  42. Hsiu-Ying Tseng, D.O.Rowland Heights, CA 917481689683831
  43. Jerry Tseng, MDSan Diego, CA 921281528049897
  44. Jocelyn TsengBurlingame, CA 940101538554159
  45. Lillian Tseng, M.D.Walnut Creek, CA 945961619016169
  46. Samuel Tseng, MDWalnut Creek, CA 945961821148636
  47. Shien Tseng, M.D.Stockton, CA 952151639388325
  48. Stephen Tseng, MDIone, CA 956401346328077
  49. Thomas Tseng, DOMonterey Park, CA 917541912017211
  50. Tony Tseng, M.D., M.S.South Gate, CA 902801558523670

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.