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 263 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. Efren RilloPerris, CA 925711295878320
  2. Nitasha Rimar, M.D.Irvine, CA 926181073750667
  3. Bryan Rimel, MDSanta Rosa, CA 954031295902831
  4. Shelly Rimler, M.D.Anaheim, CA 928061366768723
  5. Dean Rinard, M.D.Sacramento, CA 958231043311335
  6. Heini Rinderknecht, MDEscindido, CA 920251316992449
  7. Christopher Rios, MDSan Francisco, CA 941431316689334
  8. Daniel Rios, MDNapa, CA 945581821176652
  9. David Rios, M.D.Los Angeles, CA 900271881889301
  10. Elena Rios, MDLos Angeles, CA 900951932121407
  11. Michelle Rios, M.D.Santa Monica, CA 904041447495411
  12. Tomas Rios, M.D.Avenal, CA 932041891736468
  13. Susan Ripper, M.D.Stanford, CA 943051649569658
  14. James Ripple, M.D.Lemoore, CA 932461457579781
  15. Madhavi Risbud, MDBakersfield, CA 933011306913322
  16. Miguel Risco, MDFresno, CA 937011942445812
  17. Komal Rishi, M.D.Walnut Creek, CA 945961336332816
  18. Jenny Risman, M.D., PH.D.Anaheim, CA 928061124332325
  19. Jessica Ristau, M.D.San Francisco, CA 941101174987960
  20. Bryan Ristow, M.D.San Francisco, CA 941151447303565
  21. Simon Ritchken, M.D.San Diego, CA 921171255399341
  22. Annette Rittmann, MDLos Angeles, CA 900271760553747
  23. Dale Ritzo, M.D.San Mateo, CA 944011255499323
  24. Antonio Rivas, M.D.Torrance, CA 905021740572551
  25. Carlos Rivas, M.D.Redwood City, CA 940611285066878
  26. Doris Rivas, M.D.Downey, CA 902421043699374
  27. Madalyn RivasStockton, CA 952041447830187
  28. Ricardo Rivas-PlataPasadena, CA 911051609961929
  29. Janice RivelleFountain Valley, CA 927081174064471
  30. Ana RiveraPalo Alto, CA 943011760915649
  31. Cristina Rivera, MDSan Diego, CA 921231912536806
  32. Kimberly RiveraSan Diego, CA 921341831727288
  33. Lemuel Vince RiveraSacramento, CA 958171770184608
  34. Mercedes Rivera, M.D.Vallejo, CA 945901730375841
  35. Paolo Rivera, M.D.Granada Hills, CA 913441740635291
  36. Robert Rivera, MDBurbank, CA 915021659447977
  37. Ryan Rivera, D.O.Oakland, CA 946111720273055
  38. Jonathan Rivkin, MDCarlsbad, CA 920081689717886
  39. Suzanne Rizkalla, M.D.Loma Linda, CA 923541043324742
  40. Nadia Rizvi, M.D.Oceanside, CA 920561184065922
  41. Seema Rizvi, DOFairfield, CA 945331619055423
  42. Dean Rizzi, MDSacramento, CA 958251942837760
  43. Edward Ro, MDRiverside, CA 925051265580294
  44. Brian Roach, M.D.Burlingame, CA 940101215940887
  45. Karen Roach, RNPRiverside, CA 925061164455051
  46. March Angela Roan, MDVan Nuys, CA 914051386766798
  47. Travis Roark, MDLa Jolla, CA 920371326601485
  48. Adam Robarge, MDRiverside, CA 925011295476471
  49. Mark Robb, MDOakland, CA 946011053499665
  50. Paul Robb, M.D.Fontana, CA 923351811296650

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.