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 313 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. Elizabeth Thomas, MDRichmond, CA 948011891870564
  2. Emily ThomasSan Francisco, CA 941101679967996
  3. Eva Thomas, MDOakland, CA 946111205922077
  4. Jay Thomas, MDSouth Pasadena, CA 910301013092980
  5. Jeffrey ThomasOrange, CA 928671932337136
  6. Jeffrey Thomas, M.D.Chico, CA 959291174650691
  7. Joel Thomas, M.D.Torrance, CA 905051386022234
  8. Katherine Thomas, MDBakersfield, CA 933011033555354
  9. Kim Thomas, DOSan Diego, CA 921291083637755
  10. Larissa Thomas, MDSan Francisco, CA 941101508192873
  11. Maxwell Thomas, M.D.West Hollywood, CA 900481972091429
  12. Remil Thomas, MDModesto, CA 953501851040554
  13. Robert Thomas III, M.D., PHDSan Diego, CA 921031053765909
  14. Ara Thomassian, M.D.Valley Village, CA 916071609118777
  15. Razmik Thomassian, M.D.Duarte, CA 910101518351733
  16. Caprice Thompson, DOLa Mesa, CA 919421528521788
  17. Clinton Thompson, M.D.Laytonville, CA 954541609105493
  18. Dean Thompson, MDSanta Rosa, CA 954031982788964
  19. Gary Thompson, DOMoreno Valley, CA 925551316971468
  20. Gregory Thompson, M.D.Carmel Valley, CA 939241407127947
  21. Mark Thompson, M.D.Torrance, CA 905031881615276
  22. Nailah Thompson, DOOakland, CA 946111417170242
  23. Oluwatoyin Thompson, MDSan Diego, CA 921031841942661
  24. Paul Thompson, MDLa Jolla, CA 920371275095523
  25. Steven Thompson, M.D.San Francisco, CA 941161285714006
  26. Tracy Thompson, MDDublin, CA 945681821076258
  27. Vanessa Thompson, M.D.San Francisco, CA 941101356572770
  28. William Thompson, M.D.Newport Beach, CA 926631174588891
  29. Chelsea Thomsen, M.D., M.S.P.HSan Francisco, CA 941271003227927
  30. Benjamin Thonar, MDWhittier, CA 906021356570022
  31. Marut ThongcharoenSan Leandro, CA 945771710132980
  32. Nicolas Thor, MDColton, CA 923241861078545
  33. Hilda Thorisdottir, M.D.La Jolla, CA 920371689755720
  34. Annette Thorn, MD MPHSan Rafael, CA 949011205233889
  35. Lorna Thornton, MDMenlo Park, CA 940251104909027
  36. Richard Thorp, M.D.Chico, CA 959261730122029
  37. Naveen Thota, MDOakland, CA 946091972717304
  38. Christopher Thrash, M.D.Santa Barbara, CA 931051821225228
  39. Ei Ei Thu, MDRedlands, CA 923731578988994
  40. Vijay Thukral, M.D.Milpitas, CA 950351760593644
  41. Abhinav ThummalaLos Angeles, CA 900951558063628
  42. Phyllis Thurstone, M.D.Palo Alto, CA 943041477844702
  43. Dirk Thye, MDSouth San Francisco, CA 940801619696978
  44. David Tian, M.D.Oakland, CA 946021427390186
  45. Irineo Tiangco, M.D.National City, CA 919501245322213
  46. Nancy Tibbs, MDStanford, CA 943051386736015
  47. Jeffrey Tice, MDSan Francisco, CA 941431912951385
  48. Timothy Tidwell, MDAtascadero, CA 934221275972325
  49. Justin Tien, MDSan Francisco, CA 941431609370345
  50. Lawrence Tierney, M.D.San Francisco, CA 941211427141498

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.