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 42 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. Joel Byrd, M.D.Los Angeles, CA 900021548366602
  2. Richard Byrd, M.D.Indian Wells, CA 922101548369853
  3. Tiffany Byrd, M.D.Edwards Afb, CA 935241750601506
  4. John ByrneLoma Linda, CA 923571700805504
  5. Megan Byrne, MDRedwood City, CA 940631538643903
  6. Maria Byron, MDSan Francisco, CA 941431295024016
  7. Lakshmi Bythadka, M.D.San Jose, CA 951341598909764
  8. Nory Jun Cabanilla, M.D.West Hollywood, CA 900481801163183
  9. Marie Jo-Ann Cabanting, M.D.Roseville, CA 956611134561178
  10. Dzenana Cabaravdic, MDThousand Oaks, CA 913601063152882
  11. Phillip Cabasso, M.D.Arcadia, CA 910071609812841
  12. Emily Cabebe, MDSanta Clara, CA 950511356307474
  13. Jeanne Cabeza, MDSalinas, CA 939061598716227
  14. Robert Cabico, M.D.Chula Vista, CA 919111962796672
  15. Ruben Cabral, MDFullerton, CA 928351568458008
  16. Claudia CabreraSylmar, CA 913421861981151
  17. John Cabrera, MDPorterville, CA 932571952970188
  18. Juan Cabrera, M.D.Irvine, CA 926181447254792
  19. Luis Cabrera, DOLancaster, CA 935341306586607
  20. Malrubio Cabrera, MDSacramento, CA 958231871671537
  21. Catherine Joy CabugaoRancho Cucamonga, CA 917301063091098
  22. Paul Matthew Cabugao, MDOrange, CA 928681902508997
  23. Wendy Caceres, M.D.Stanford, CA 943051528358546
  24. Vince Patrick Cacho, MDGlendale, CA 912041477759371
  25. Clarisse Cadang, M.D.Fairfield, CA 945341588083075
  26. Rodolfo Cadang, M.D.Hercules, CA 945471508898990
  27. John Jay Cadavona, MDLos Angeles, CA 900951235627456
  28. Rumi Cader, MDNorth Hills, CA 913431508898214
  29. Karen Cadman, M.D.San Diego, CA 921031669498754
  30. Sarah Cadman, M.D.Pomona, CA 917671427003490
  31. Virginia Cafaro, MDSan Francisco, CA 941141174596969
  32. Cynthia Caffrey, MDSanta Paula, CA 930601922156991
  33. Ian Cahatol, DOVentura, CA 930031750876579
  34. Julie Cahill, M.D.Concord, CA 945201114171980
  35. William Cahill, MDSan Francisco, CA 941021366461048
  36. Ahmed Cahla, MDRedondo Beach, CA 902781275110314
  37. Andrew Cai, M.D.Torrance, CA 905021881133247
  38. Ru Cai, MDSacramento, CA 958171134230220
  39. Zhe Cai, M.D.San Francisco, CA 941341114180916
  40. Annamaria Calabro, M.D.La Jolla, CA 920371508843244
  41. Lauren Caldemeyer, MDLos Angeles, CA 900951386221943
  42. Laura Calderon, MDModesto, CA 953501568536159
  43. Marirose Calderon, MDMountain View, CA 940401063837680
  44. Marc Calestini, M.D.Mountain View, CA 940401992965776
  45. Francesca Calicchio, MDTemecula, CA 925921417533571
  46. Beverly Calkins, MDRoseville, CA 956611639123722
  47. Christopher Calkins, MDStanford, CA 943051144809666
  48. Zachary Call, MDSan Francisco, CA 941091760944805
  49. Rachel Callaghan, M.D.Oakland, CA 946091548239627
  50. Barbara Callahan, M.D.West Hills, CA 913071124111653

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.