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 92 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. Yiyu Feng, MDRoseville, CA 956611376621003
  2. Yongqing Feng, M.D.Rowland Heights, CA 917481497806988
  3. Zhen Zhou Feng, M.D.Santa Rosa, CA 954031871600031
  4. Cynthia Fenton, M.D.Mill Valley, CA 949411063720431
  5. Jamison Feramisco, MD, PHDSan Diego, CA 921191043410871
  6. Bruce FergusonPalm Springs, CA 922641811999717
  7. Diane Ferguson, M.D.Redondo Beach, CA 902771447294384
  8. Dianna Ferguson, M.D.Burbank, CA 915051194826594
  9. Heather Ferguson, MDLoma Linda, CA 923501144849175
  10. Monica Ferguson, MDSanta Rosa, CA 954051528176989
  11. Elizabeth Fernandes, MDFairfield, CA 945351043398134
  12. Nikita FernandesSunnyvale, CA 940861730612581
  13. Alicia Fernandez, MDSan Francisco, CA 941101376650168
  14. Diego Fernandez, M.D.Oakland, CA 946091871957712
  15. Eric Fernandez, M.D.Valencia, CA 913551326052887
  16. John FernandezWest Hollywood, CA 900691134652357
  17. Kimberly Fernandez, MDSan Diego, CA 921011154972388
  18. Raymond Fernandez, MDLaguna Hills, CA 926531629039532
  19. Victor Fernandez, MDFresno, CA 937201336227248
  20. Christaline Fernando, M.D.San Jose, CA 951281417115635
  21. Ronald Fernando, MDLoma Linda, CA 923571447355565
  22. Susan Fernyak, MDOakland, CA 946121679688014
  23. Doralice Ferreira, DODowney, CA 902411578068516
  24. Orlanda Ferreira, MDSanta Paula, CA 930601295199693
  25. Waldo Ferrer, MDAntioch, CA 945091881772978
  26. Peter Ferrera, M.D.Long Beach, CA 908131366481384
  27. Richard Ferreras, MDPalm Springs, CA 922621932168051
  28. Jason Ferries, M.D.Sacramento, CA 958171609859974
  29. Sarah Ferris, M.D.Sacramento, CA 958171922083955
  30. Debra Fetters, MDCampbell, CA 950081689751547
  31. Ariana Feuvrier, MDLa Mesa, CA 919411548847437
  32. Mario Ficarola, M.D.Corona, CA 928831104939529
  33. Gulzar Fidai, MDTorrance, CA 905031851398218
  34. Suzanne Fidler, M.D.Sacramento, CA 958161992866701
  35. Christopher Fields, MDSan Diego, CA 921541427623677
  36. David Fields, MDMartinez, CA 945531831277938
  37. Donald Fields, MDBellflower, CA 907061457428336
  38. Karen Fields, MDCamarillo, CA 930101497779656
  39. Thomas Fiene, M.D.Menlo Park, CA 940251992977573
  40. Leland Fife, MDMerced, CA 953401285745521
  41. Dolores Figueroa, M.D.Pasadena, CA 911051033287701
  42. Mark Filidei, D.O.Newport Beach, CA 926601518039197
  43. Sylvia Filipov, M.D.Santa Barbara, CA 931101417344060
  44. Hector FilizolaLos Angeles, CA 900951164162301
  45. Merri Finchem, MDSan Diego, CA 921201487702320
  46. Jeremy Fine, MDLos Angeles, CA 900671225073190
  47. Matthew Fine, M.D.Oroville, CA 959661760437446
  48. Jeffrey Finer, MDPHDFoster City, CA 944041841759552
  49. Daniel Fink, M.D.Los Angeles, CA 900481487757985
  50. Samuel Fink, M.D.Tarzana, CA 913561740376433

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.