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 62 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. Sook Chung, M.D.Harbor City, CA 907101306824487
  2. Wayne Chung, MDSan Francisco, CA 941111669404653
  3. Wen-Che Chung, MDArcadia, CA 910061891754149
  4. Wen-Hsiang Chung, M.D.Los Angeles, CA 900331619184082
  5. William Chung, MDSouth San Francisco, CA 940801083792683
  6. Winston Chung, MDLos Alamitos, CA 907201851322085
  7. Edwin Chuong, M.D.Diamond Bar, CA 917651427231802
  8. Kacy Church, M.D.Burlingame, CA 940101457642027
  9. Emily Churchill, MDSan Diego, CA 921031831129469
  10. Warren Churg, M.D.West Hills, CA 913071629020490
  11. Eric Chwa, M.DArcadia, CA 910071962433607
  12. Jasmine ChwaEl Monte, CA 917311831201805
  13. Nilar Chwa, M.DArcadia, CA 910071316978067
  14. Alexander Chyorny, MDSan Jose, CA 951281750358016
  15. Daniel Chyu, MDSan Jose, CA 951191043398548
  16. Sheila Chyu, MDMilpitas, CA 950351548347495
  17. Paul Cianci, M.D.San Pablo, CA 948061043390115
  18. Brandon Ciaudelli, DOLa Jolla, CA 920371346746948
  19. Jerry Cimmarusti, MDCovina, CA 917231386603322
  20. Pelin Cinar, M.D.Palo Alto, CA 943041528201209
  21. Dana Ciobanu, D.OAuburn, CA 956021003186644
  22. Samuel Cipoletti, M.DSan Jose, CA 951231477576429
  23. Paul Cisarik, MDOxnard, CA 930361952515421
  24. Gerardo Cisneros-Seibel, MDSan Diego, CA 921081194706408
  25. Willie Citrin, MDRiverside, CA 925031558321497
  26. Jitka Civrna, M.D.Palm Desert, CA 922601821057035
  27. Dustin Cladera, M.D.San Diego, CA 921011578719720
  28. Edward CladeraSan Diego, CA 921231588810329
  29. Ryan ClaggBurbank, CA 915051740644723
  30. John Clancy, DOVista, CA 920811962506238
  31. Ryan Clare, MDLos Angeles, CA 900271588925226
  32. Joel Clarfield, M.D.Mission Hills, CA 913451700941788
  33. Lauren Clarine, D.O.San Marcos, CA 920781669738928
  34. Dino Clarizio, M.D.Arcadia, CA 910071437165602
  35. Daniel Clark, M.D.Ventura, CA 930031114080082
  36. Dennis Clark, MDLong Beach, CA 908081699700849
  37. Douglas Clark, M.D.Garden Grove, CA 928431780688572
  38. Erika ClarkChico, CA 959261083292015
  39. John Clark, MDSan Diego, CA 921031467713800
  40. Johnson Clark, MDSanta Rosa, CA 954031104976810
  41. Kerry Clark, M.D.Valencia, CA 913551093802365
  42. Lori ClarkLaguna Hills, CA 926531972634897
  43. Mark Clark, MDGlendale, CA 912141891874665
  44. Theresa Clark, MDVista, CA 920831528104650
  45. Catharine Clark-Sayles, M.D.Greenbrae, CA 949041518952860
  46. Camille Clarke, M.D.Fresno, CA 937061265793004
  47. Julie Clarke, MDWoodland Hills, CA 913671750649042
  48. Orette Clarke, D.O.Los Angeles, CA 900611275322729
  49. Patrick Clarke, M.D.Tustin, CA 927801194015891
  50. Robin Clarke, M.D.Los Angeles, CA 900951780824490

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.