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 36 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. Mark BookspanSanta Barbara, CA 931051104908292
  2. Joseph Boone, DOSan Diego, CA 921341558946947
  3. Matthew Boone, MDCosta Mesa, CA 926271487685095
  4. Srisook Boonsue, M.D.Sylmar, CA 913421760503338
  5. Erie Boorman, MDLos Angeles, CA 900251336107796
  6. Peter Boorstein, MDVallejo, CA 945891629156443
  7. Derek Booth, DOSan Diego, CA 921341699397554
  8. Thomas Booth, MDSan Mateo, CA 944041245278027
  9. James Boozer, MDModesto, CA 953501427046986
  10. Kulvinder Boparai, M.D.Citrus Heights, CA 956101669401386
  11. Rosie Boparai, MDBakersfield, CA 933011740226398
  12. Vandana Boparai, MDPleasanton, CA 945881851432652
  13. Julie Borba, M.D.Whittier, CA 906021306033113
  14. Rahael Borchers, MDSan Francisco, CA 941101184360588
  15. Princess Gladys Bordador, M.D.Torrance, CA 905031952366304
  16. Kimberly Borden, MDMoreno Valley, CA 925551063900165
  17. Tyrone Bordenave, M.D.Inglewood, CA 903011265543292
  18. Talya Bordin-WoskSan Diego, CA 921031801184973
  19. Michael Bordofsky, MDSanta Barbara, CA 931031073505327
  20. Thaddeus Bordofsky, M.D.Santa Barbara, CA 931051760542583
  21. Ignacio Borenstein, MDBaldwin Park, CA 917061174013585
  22. Jeff Borenstein, MDPorter Ranch, CA 913261326260522
  23. Philip Borgardt, M.D.San Luis Obispo, CA 934011952326498
  24. Clariza Joyce Borile, MD, MSOakland, CA 946021285369553
  25. Lily Boris, M.D.Campbell, CA 950081801988977
  26. Almaz Borjoev, MDOrange, CA 928681518454339
  27. Hena Borneo, DOOakland, CA 946111770765869
  28. Bruce Bornfleth, M.D.Palm Springs, CA 922621083607667
  29. Ganna Borodina, MD, PHDSan Jose, CA 951281225615453
  30. Michael Borookhim, M.D.Beverly Hills, CA 902101578576328
  31. Michael Borovay, M.D.Torrance, CA 905031174575476
  32. Victoria Borovsky, M.D.Encino, CA 913161932130481
  33. Minal Borsada, MDAnaheim, CA 928011457485500
  34. Bradley Borsari, MDFullerton, CA 928351104826619
  35. Katharine BorthwickLos Angeles, CA 900951841634094
  36. Sara Bosomworth, DOBerkeley, CA 947041548849078
  37. Gerard Boss, M.D.San Diego, CA 921031053346080
  38. Amy Bossen, M.D.San Francisco, CA 941091558371260
  39. Anne BosshardtBerkeley, CA 947041841435427
  40. Eugene BostonFullerton, CA 928351023019965
  41. Beverly Botnick, MDArcadia, CA 910061790754455
  42. Jacqueline Botros, M.D.San Jose, CA 951281972747798
  43. Tin Botzler, MDLos Angeles, CA 900331831491695
  44. Nicolas BoueySacramento, CA 958171770160780
  45. Panagiotis Bougas, M.D.Fullerton, CA 928351295814275
  46. Kevork Bouldoukian, M.D.Bakersfield, CA 933011720020464
  47. Katherine Bourbeau-Medinilla, MDColton, CA 923241790245116
  48. Bryan Bourdeau, MDSan Francisco, CA 941431750876991
  49. Natalie BouriEncino, CA 914361700536067
  50. Michelle Bourke, M.D.Greenbrae, CA 949041750533881

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.