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 198 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. Jose Marquez, MDSan Diego, CA 921031528440468
  2. Ma Theresa Marquez, MDFresno, CA 937031598870859
  3. Patricia Marquez, MDAzusa, CA 917021336109453
  4. Sarah Marquez, M.D.Mission Hills, CA 913451154854826
  5. Dorothy Marquez-Maneja, MDNewport Beach, CA 926631750473187
  6. Joseph Marquis, MDOakland, CA 946011598084329
  7. Mark Marrama, MDAlameda, CA 945011700950318
  8. Liza Marroquin, MD MBAChula Vista, CA 919111841383270
  9. Alva Marsh, MDLynwood, CA 902621619036621
  10. Michael Marsh, M.D.Toluca Lake, CA 916021619992047
  11. Glenn Marshak, M.D.Beverly Hills, CA 902111104890029
  12. Edward Marshall, M.D.Sherman Oaks, CA 914031972743904
  13. Elsa Marshall, M.D.El Monte, CA 917331932219342
  14. Granville Marshall, M.D.Susanville, CA 961301477761765
  15. Robert Marshall, MDSouth San Francisco, CA 940801801960117
  16. Robert Marshall, MDTravis Afb, CA 945351265412746
  17. Julie Marshburn, M.D.Laguna Hills, CA 926531154507192
  18. Alexander Marson, M.D., PH.D.San Francisco, CA 941431417276254
  19. Violeta Martel, MDSantee, CA 920711104903178
  20. Axa Martell, M.D.Loma Linda, CA 923541174540942
  21. Jerry Martell, M.D.Loma Linda, CA 923541558383802
  22. Adriana Martin, M.D., PH.D.San Francisco, CA 941431003263583
  23. Angela Martin, MDRiverside, CA 925051316007586
  24. Arcelia Martin, MDBaldwin Park, CA 917061154492114
  25. David Martin, M.D.South San Francisco, CA 940801245585413
  26. Derrick Martin, MDClovis, CA 936121417576208
  27. Jeffrey Martin, M.D.San Francisco, CA 941101669674982
  28. John Martin, MDLos Angeles, CA 900271598832446
  29. Kevin Martin, DOHemet, CA 925431710484530
  30. Marina Martin, MDPalo Alto, CA 943041225113251
  31. Marlene Martin, M.D.San Francisco, CA 941101831465152
  32. Michael Martin, M.D.San Diego, CA 921301629088026
  33. Michael Martin, M.D.San Francisco, CA 941101306065412
  34. Michael Martin, M.D.San Jose, CA 951281174655633
  35. Nikki Martin, MDSanta Cruz, CA 950601851317945
  36. Phillip Martin, MDLake Isabella, CA 932401275580680
  37. Spencer Martin, M.D.Brentwood, CA 945131942325220
  38. Susanne Martin, MDSan Mateo, CA 944011568610525
  39. Thomas Martin, M.D.San Diego, CA 921031093193583
  40. Thomas Martin, MDSan Francisco, CA 941431649234790
  41. Toni Martin, MDBerkeley, CA 947041326182916
  42. Charles Martineau, M.D.El Segundo, CA 902451225099591
  43. Thomas Martinelli, MDSanta Barbara, CA 931031033199518
  44. Adali MartinezSan Francisco, CA 941101679060560
  45. Adriana MartinezSacramento, CA 958171154026235
  46. Aida MartinezTorrance, CA 905021578145678
  47. Armando Martinez, MDSan Diego, CA 921031598261091
  48. Asuncion Martinez, MDSan Jose, CA 951281760541189
  49. Camilo Martinez, M.D., PH.D.Culver City, CA 902301518357474
  50. Carlos Martinez, MDLos Angeles, CA 900041548572795

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.