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 268 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. Ruth Rubin, M.D.Corte Madera, CA 949251043238041
  2. Adrian Rubin Jr., MDPanorama City, CA 914021316006992
  3. Martin Rubinger, M.D.Santa Rosa, CA 954051215995337
  4. Mark Rubinstein, M.D.San Francisco, CA 941431750311346
  5. Marissa Rubio, M.D.San Diego, CA 921231821017203
  6. Rosalio Rubio, M.D.Modesto, CA 953501215103056
  7. Salvador RubioEl Monte, CA 917311194523795
  8. Sergio Rubio, M.D.Santa Barbara, CA 931031639520935
  9. Agnes Rubio-Joaquin, MDLos Angeles, CA 900341770631509
  10. Lloyd Rucker, MDOrange, CA 928681407950090
  11. Richard Rucker, M.D.Los Alamitos, CA 907201659477685
  12. David Ruckman, M.D.Fullerton, CA 928351285620658
  13. Peter Rudd, MDStanford, CA 943051295802411
  14. Ivan Rudenko, MDFountain Valley, CA 927081477040517
  15. Steven Ruderman, MDLa Jolla, CA 920371700977311
  16. Bari Rudikoff, M.D.Palo Alto, CA 943041972565836
  17. Alla Rudin, MDDaly City, CA 940151750453593
  18. Daren Rudisaile, M.D.Moreno Valley, CA 925551477998862
  19. Alfred Rudolph, M.D.Los Altos Hills, CA 940221437391703
  20. Michael Rudolph, M.DHuntington Park, CA 902551982624524
  21. Rajani Rudrangi, MDFrench Camp, CA 952311487841482
  22. Vivek Rudrapatna, M.D.Salinas, CA 939011740477074
  23. George Rudy, M.D., PH.D.San Francisco, CA 941071598876310
  24. Stefan Ruehm, MDLos Angeles, CA 900241669416632
  25. Asim RuhelaBakersfield, CA 933011043694987
  26. Gediminas Ruibys, M.D.Carmel, CA 939231932365780
  27. Jose Ruiz, MDBellflower, CA 907061104013895
  28. Magdalena Ruiz, M.D.Santa Barbara, CA 931051558525857
  29. Rahel RuizCastro Valley, CA 945521821089129
  30. Monica Ruiz Durant, MDWalnut Creek, CA 945981750433587
  31. Andrea Ruman, MDLos Angeles, CA 900951962428045
  32. Angela Ruman, MDLos Angeles, CA 900951598785669
  33. Sara-Megumi RumrillSan Francisco, CA 941211962777078
  34. Eva Runnman, MDSan Diego, CA 921201427125350
  35. Bernice Ruo, MDSan Diego, CA 921031093748881
  36. John Rupnik, M.D.Napa, CA 945581942290770
  37. Yash Rusconi-RodriguesBerkeley, CA 947101962961276
  38. Joshua Rushakoff, MD, MPPWest Hollywood, CA 900481144889817
  39. Robert Rushakoff, MDSan Francisco, CA 941431336103480
  40. Dana Russell, DOLos Angeles, CA 900891952861163
  41. John Russell, M.D.Emeryville, CA 946081689634958
  42. Kellie Russell, D.O.Mission Hills, CA 913451588856322
  43. Marie Russell, MD.San Marcos, CA 920691609947449
  44. Marlon Russell, M.D.Victorville, CA 923951497039119
  45. Melissa Russell, DOVentura, CA 930031114543998
  46. Michael Russell, M.D.Pittsburg, CA 945651578615316
  47. Sarah Russell, MD, MPHILStanford, CA 943051467595777
  48. Scott Russell, DOBermuda Dunes, CA 922031073581237
  49. Anthony Russo, MDSanta Cruz, CA 950621831148287
  50. Christopher Russo, DO, MPHStockton, CA 952091326300245

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.