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 199 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. Francisco Martinez, MDChula Vista, CA 919141972516151
  2. Genaro Martinez, M.D.San Bernardino, CA 924041235157843
  3. Jorge Martinez, M.D.Murrieta, CA 925631992748883
  4. Kevin Martinez, M.D.San Francisco, CA 941151083841332
  5. Lindsy Martinez, M.D.Santa Cruz, CA 950621336672336
  6. Linette Martinez, MDSan Francisco, CA 941021245352137
  7. Luis Martinez, D.O.Bakersfield, CA 933091194088583
  8. Miguel Martinez, M.D.National City, CA 919501225324692
  9. Suzanne Martinez, M.D.Sacramento, CA 958231396975991
  10. Travis Martinez, MDColton, CA 923241265012546
  11. Jose Martinez Cardenas, M.D.Reseda, CA 913351700827052
  12. Vanessa Martinez GuerraFremont, CA 945381093400970
  13. Jorge Martinez-Cuellar, M.D.Fresno, CA 937101750568523
  14. David Martins, GENERAL INTERNISTLos Angeles, CA 900621104953074
  15. Umaima Marvi, MDSan Jose, CA 951281316129083
  16. Anupam Marwaha, M.D.Loma Linda, CA 923541770525693
  17. Raj Marwaha, MDSacramento, CA 958291770782252
  18. Rishu Marwaha, MDPomona, CA 917671457490294
  19. Siamak Marzban, M.D.San Pedro, CA 907321164447959
  20. Erica MascarenhasStanford, CA 943051114554474
  21. Sundari Mase, MD MPHSan Francisco, CA 941101972510576
  22. Soroosh Mashayekh, M.D.Irvine, CA 926031417139205
  23. Nick Mashour, M.DCosta Mesa, CA 926261508896515
  24. Jonas Masikat, M.DHayward, CA 945451043414246
  25. Renato Masilungan, MDNational City, CA 919501528077757
  26. Aarti Maskeri, MDLos Angeles, CA 900271528135357
  27. Kishore Maskey, MDAntioch, CA 945091568540631
  28. Michael Mason, MDSan Rafael, CA 949031215011200
  29. Oliver Mason, MDCerritos, CA 907031871606434
  30. Susannah Mason, MDPanorama City, CA 914021174690002
  31. Ariba Masood, MDTorrance, CA 905051730708603
  32. Gule-Rana Masood, MDPleasanton, CA 945881508838020
  33. Nayyar Masood, M.D.San Jose, CA 951381639499866
  34. Farzad Masroor, MDOakland, CA 946111467686212
  35. Martin Mass, M.D.San Francisco, CA 941101922013382
  36. Sasan Massachi, M.D.Beverly Hills, CA 902111134378763
  37. John Massaro, DOSan Luis Obispo, CA 934011588665293
  38. Ellen Masse, M.D.Woodland Hills, CA 913641922358308
  39. Denise Massey, MDSan Jose, CA 951241487719118
  40. David Massil, M.D.Roseville, CA 956611528246840
  41. Micheal Massoud, D.O.Vacaville, CA 956881194183012
  42. Navid Massoudi, MDCanyon Country, CA 913871063450351
  43. Ramona Master, MDLa Jolla, CA 920371851429617
  44. Alix MastersLos Angeles, CA 900951316641202
  45. Henry Masters, MDWhittier, CA 906051336599711
  46. Sally Masters, M.D.Healdsburg, CA 954481043278625
  47. Kerri Masutto, M.D.San Francisco, CA 941081780913442
  48. Eran Matalon, M.D.Santa Rosa, CA 954051073656815
  49. Mousa Matar, M.D.Riverside, CA 925061992116982
  50. Amy Matecki, MDStanford, CA 943051770571077

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.