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 73 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. Juan De La Cruz MayhuaClovis, CA 936191619596426
  2. Arbatel De La Cuesta, M.D.Rancho Mirage, CA 922701477968360
  3. James De La Flor, M.D.Santa Clarita, CA 913211710981626
  4. Andres Gavino De La Llana, MDApple Valley, CA 923071497802094
  5. David De La Loza, MDLos Angeles, CA 900221346326394
  6. Joseph De La Merced, M.D.Los Angeles, CA 900271578907051
  7. Maritza De La Pena, MDRancho Mirage, CA 922701780911586
  8. Angelo De La Rosa, MDLos Angeles, CA 900671730748492
  9. Jose De La Rosa, M.D.San Diego, CA 921341689646572
  10. Pedro De La Rosa, MDLong Beach, CA 908081114940145
  11. Renato De La Rosa, MDChula Vista, CA 919111114966777
  12. Mercedes Ann De Las Alas, M.D.Murrieta, CA 925631477587673
  13. Baldomero De Leon, M.D.Walnut Creek, CA 945981891819090
  14. Victor De Leon-Hernandez, MDSan Diego, CA 921551306327473
  15. Chinnavuth De Monteiro, M.D.Concord, CA 945201558392449
  16. Edsil De Ocampo, MDSan Ramon, CA 945831265698567
  17. Pamela De Silva, MDPalmdale, CA 935511568414548
  18. Piyumika De Silva, M.DBeverly Hills, CA 902111700237393
  19. Josias De Trinidad Castro, M.D.Parlier, CA 936481861831646
  20. William De Wolf, M.D.Oakland, CA 946091538274055
  21. Andrew Dea, MDBellflower, CA 907061982771853
  22. Kyle Deacon, MDSanta Barbara, CA 931101588234140
  23. Charity Dean, MDSanta Barbara, CA 931101396907408
  24. Chelsea Dean, M.D.Santa Barbara, CA 931101023469335
  25. Teresa Dean, M.D.Santa Monica, CA 904031255538781
  26. John Deane, MDSan Rafael, CA 949031811071806
  27. Karen Grace Deaquino-Corley, M.D.Sacramento, CA 958151891954152
  28. Bruce Deas, MDLakeport, CA 954531639189715
  29. Robert Debare, MDOakland, CA 946111124106901
  30. John Debeixedon, M DPasadena, CA 911051679643126
  31. Robert Debruin, M.D.Folsom, CA 956301073507786
  32. Courtney Decan, MDSanta Monica, CA 904041659831212
  33. Marlon Decastro, M.D.Santa Rosa, CA 954051780643270
  34. Jerome Deck, MDPleasanton, CA 945881073691168
  35. Jennifer Deconde, M.D.San Diego, CA 921211205064326
  36. Alec Dedavets, M.D.Yuba City, CA 959911073800066
  37. Lauren Dedecker, MDLos Angeles, CA 900951841877446
  38. Jocelyn DeeLos Angeles, CA 900331053495663
  39. Andrew Deen, MDTurlock, CA 953821225073000
  40. Hashim Deen, M.D.La Jolla, CA 920371194041319
  41. Omer Deen, MDRolling Hills Estates, CA 902741417123332
  42. Mosen Defrawy, MDMontebello, CA 906401457409401
  43. Triveni Defries, M.D, MPHSan Francisco, CA 941101275970972
  44. Teresita Degamo, MDDaly City, CA 940151558449363
  45. Alberto Degiovanni, MDPomona, CA 917671376070102
  46. Patrick Degregorio, MD, MBALos Angeles, CA 900951619505864
  47. Fatma Deif, M.D.La Mesa, CA 919411538553508
  48. Robert Deiss, MDSan Diego, CA 921031194977652
  49. Clayton Dejong, MDLong Beach, CA 908141467466409
  50. Ken DekitaniLos Angeles, CA 900951003376716

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.