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 128 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. Syed Hossain, M.D.Los Angeles, CA 900041154546497
  2. Ariana Hosseini, MDSan Francisco, CA 941211437562824
  3. Kiarash Hosseinian, MDLos Angeles, CA 900271831247717
  4. Warren Hosseinion, M.D.Glendale, CA 912041629170527
  5. Kaven HosseinzadehMurrieta, CA 925631912359605
  6. Karl Hostetler, M.D.San Diego, CA 921031477501450
  7. Isaure Hostetter, MD MPHSan Jose, CA 951281932737996
  8. Suresh Hosuru, M.D.,Stockton, CA 952091477782910
  9. Allan Hotti, MDFoster City, CA 944041497170914
  10. Anthony Hou, MDWoodland Hills, CA 913671164616306
  11. Randy Hou, MDWest Hollywood, CA 900481952561284
  12. Merritt Hougen, M.D.La Jolla, CA 920371851368252
  13. Veronique Hourany, M.D.Pomona, CA 917671669551826
  14. Arianna HourianiWest Hollywood, CA 900481255828562
  15. Erin Hourigan, MDSan Diego, CA 921341790275477
  16. Iyad Houshan, M.D.Santa Ana, CA 927041497773287
  17. Wesam Houshan, MDSanta Ana, CA 927041356467112
  18. Ali Houshyar, MDPlacentia, CA 928701568434595
  19. Arielle Houston, MDSelma, CA 936621720667959
  20. Caron Houston, MDCarmichael, CA 956081013132596
  21. Armen Hovhannisyan, MDInglewood, CA 903051740488998
  22. Arkady HovssepianColton, CA 923241245847060
  23. Amanda Howard, MDFoster City, CA 944041467894246
  24. Dana Howard, MDWestlake Village, CA 913611932392792
  25. John Howard, MDSan Diego, CA 921151063933604
  26. John Howard, M.D.Sacramento, CA 958161952408122
  27. Stephen Howe, MDSouth San Francisco, CA 940801497833024
  28. Mary Howell, M.D.Rancho Mirage, CA 922701619165297
  29. William Howell, M.D.Los Angeles, CA 900171518999143
  30. Natalie HowlettPalo Alto, CA 943041154776094
  31. Joanna HrabiaChico, CA 959261063075448
  32. Barbara Hrach, M.D.Santa Barbara, CA 931011164575536
  33. Stephen Hryniewicki, M.D.Long Beach, CA 908061598871741
  34. Thomas Hryniewicki, M.D.Orange, CA 928661992807341
  35. Tzung Hsiai, MDLos Angeles, CA 900341508067489
  36. Esther Hsiang, MDSan Francisco, CA 941431619333952
  37. An-Fu Hsiao, MD, PHDLong Beach, CA 908221457370207
  38. Eric Hsiao, MDSan Jose, CA 951281982667606
  39. Ray Hsiao, MDHacienda Heights, CA 917451164507869
  40. Warren Hsiao, MDHarbor City, CA 907101316095391
  41. Bertran Hsieh, M.D.Los Angeles, CA 900151336330323
  42. Eric Hsieh, M.D.Los Angeles, CA 900331811941974
  43. Hui-I Hsieh, M.D.San Diego, CA 921101558697334
  44. Kou-Ying Hsieh, M.D.Emeryville, CA 946081447208731
  45. Kristine Hsieh, MDSan Francisco, CA 941151043534944
  46. Pin-Hung Hsieh, M.D.Tustin, CA 927801144323064
  47. San Hsieh, MDSan Diego, CA 921031851388847
  48. Jacqueline Hsieh-WongSacramento, CA 958171285083121
  49. Christine HsuSacramento, CA 958231043741580
  50. Daniel Hsu, DOFremont, CA 945381700961471

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.