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 187 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. Alexander LohRedwood City, CA 940631689314700
  2. Annie Loh, MDSan Francisco, CA 941151548465073
  3. Joanie Loh, MDDaly City, CA 940151205914819
  4. Sheila Loharuka, D.O.Moreno Valley, CA 925531316396351
  5. Michael Loi, DOIrvine, CA 926181861057556
  6. Silvia Loica-Mersa, M.D.Stanford, CA 943051699194001
  7. Hannah Lokos, MDLoma Linda, CA 923541962038828
  8. Anoosheh Lolachi, M.D.Lawndale, CA 902601093781197
  9. Joseph Lombard, MDTruckee, CA 961611821000811
  10. Santiago Lombo LuqueSacramento, CA 958171174029391
  11. Susan Londerville, M.D.Berkeley, CA 947081760419055
  12. Jeffrey London, MDWest Hills, CA 913071730190893
  13. John Londono, MDLos Angeles, CA 900341184795122
  14. Joseph Lonergan, M.D.San Diego, CA 921031962427310
  15. Dennis Long, M.D.La Quinta, CA 922531144319062
  16. Joseph Long, MDWalnut Creek, CA 945961225116379
  17. Marta Long, MDIrvine, CA 926121205860509
  18. Matthew Long, DO, MPHOceanside, CA 920561740863273
  19. Rebecca LongPortola Valley, CA 940281639007172
  20. Sydney Long, M.D.Fresno, CA 937201881924918
  21. Tanner LongSan Diego, CA 921031750030979
  22. Thomas Long, MD.Alhambra, CA 918011912924432
  23. William Longfellow, M.D.Rancho Mirage, CA 922701922149285
  24. William Longfellow, M.D.Rancho Mirage, CA 922701669886545
  25. Harminder Longia, MDFresno, CA 937031003821406
  26. Nicola Longmuir, MDOakland, CA 946071710065511
  27. Adriana Longo, M.D.Garden Grove, CA 928401124004999
  28. Bill Longwell, MDOakland, CA 946061821169475
  29. Robert Lonjers, MDFresno, CA 937201154409050
  30. Brian Lonquich, M.D.Goleta, CA 931111598183840
  31. Arnold Loo, D.O.Rohnert Park, CA 949281063716918
  32. Lawrence Loo, MDMoreno Valley, CA 925551750311718
  33. Patricia Loo, MDTorrance, CA 905091427215250
  34. Stephen Loo, DOSan Rafael, CA 949031174607162
  35. Rohit Loomba, MDLa Jolla, CA 920931578593521
  36. Katherine Loomis, MDLos Angeles, CA 900951255835989
  37. Mark Looney, MDSan Francisco, CA 941431386692721
  38. William Loos, M.D.Sylmar, CA 913421417099425
  39. Eurides Lopes, M.D.Eureka, CA 955011447511803
  40. Carlos Lopez, M.D.,M.P.H.Rancho Mirage, CA 922701003892894
  41. Diana Lopez, MDLos Angeles, CA 900951568042497
  42. Edgar Lopez, MDBakersfield, CA 933091033747860
  43. Joel Lopez, M.D.San Francisco, CA 941271376679910
  44. Jose Lopez, M.D.Chula Vista, CA 919111568667228
  45. Lissette Lopez, MDSan Francisco, CA 941151477627081
  46. Osvaldo Lopez, MDTemecula, CA 925901649294505
  47. Paul Lopez, M.D.Colton, CA 923241902357734
  48. Pedro Lopez, M.D.Mission Hills, CA 913451710140025
  49. Sherry Lopez, D.O.Fresno, CA 937111013043942
  50. Tony Lopez, M.D.San Diego, CA 921031184789349

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.