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 234 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. Adrian Ostrzega, M.D.Beverly Hills, CA 902111760685192
  2. Bikram Otal, MDSanta Barbara, CA 931051487449476
  3. Maria Otera, MDHarbor City, CA 907101386831071
  4. Marichelle Othman, M.D.American Canyon, CA 945031285771725
  5. Samer Othman, MDSan Luis Obispo, CA 934051437476439
  6. Camela Ott, M.D.Redondo Beach, CA 902781194049114
  7. Anna Ottaka, M.D.Newport Beach, CA 926601154613685
  8. Gunther Ottersbach, M.D.La Mesa, CA 919421215114533
  9. Daniel Otterson, MDIrvine, CA 926971093210973
  10. Valentine Otuechere, MD., MPH.Riverside, CA 925031508896275
  11. Amy OuSan Francisco, CA 941101295181907
  12. I-Chun Ou, MDRedwood City, CA 940631093867897
  13. Jonathan Ou, M.DDiamond Bar, CA 917651518109719
  14. Bashar Oudah, MDSan Diego, CA 921231831771906
  15. Aurore Oughourlian, M.D.National City, CA 919501023047016
  16. Sean Ouimet, MDSan Diego, CA 921341912430570
  17. Kevin Ouma, MDFresno, CA 937201023472743
  18. Simon Outhwaite, MDSan Clemente, CA 926731851402002
  19. Chun Ouyang, M.D., PH.D.Walnut Creek, CA 945961336115328
  20. Karen Ouyang-Shwe, MDSan Jose, CA 951191831275353
  21. Wernher Ovalle, MDHuntington Beach, CA 926461417901661
  22. Todd Ovokaitys, MDCarlsbad, CA 920081760029706
  23. Ani Ovsepian, PA-CEncino, CA 914361669298600
  24. Tevan Ovsepyan, DOMission Hills, CA 913451669635876
  25. Henry Ow-Yong, M.D.Visalia, CA 932911154435428
  26. William Owen, M.D.San Francisco, CA 941141154323483
  27. Douglas Owens, M.D.Palo Alto, CA 943041922190990
  28. Michael Owens, M.D.San Diego, CA 921131275728388
  29. Trevor Owens, DOThousand Oaks, CA 913601497338271
  30. Olufemi Owolabi, M.D.Bakersfield, CA 933081114182813
  31. Robert Oye, MDLos Angeles, CA 900951396765079
  32. Jessica Oyugi, MDSan Francisco, CA 941311801306220
  33. Deepa Oza, FNP-CSan Juan Capistrano, CA 926751336679323
  34. Sowmya Oza, M.D.San Luis Obispo, CA 934011639394836
  35. Yoko Ozawa, MDLos Angeles, CA 900341447308317
  36. Errol Ozdalga, M.D., M.S.Stanford, CA 943051982851499
  37. Ali Ozhand, M.D.Northridge, CA 913251326481698
  38. Rashid Paband, M.D.La Mesa, CA 919421407089451
  39. Sabitha Pabbathi, M.DBakersfield, CA 933071477744498
  40. Adam Pacal, M.D.San Diego, CA 921101861432270
  41. Joseph Pace, M.D.San Francisco, CA 941021598779522
  42. Sarah Pace, MD, MPHMission Viejo, CA 926911598081705
  43. Renee Pacheco, MDOakland, CA 946111477635589
  44. Merlie Pacheco-Ocampo, M.DLos Angeles, CA 900261851309157
  45. Joseph Pachorek, M.D.Pasadena, CA 911051881622843
  46. Allen Pachtman, M.D.Torrance, CA 905051225110802
  47. Alison Pachynski, MD MPHRedwood City, CA 940631013090810
  48. James Pacino, M.D.Los Angeles, CA 900331326077587
  49. Heather Paciotti, MDNapa, CA 945581992883730
  50. Jin Packard, MDOakland, CA 946021407273691

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.