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 294 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. Armando Siqueiros, MDSan Luis Obispo, CA 934011699758540
  2. Marcos Siqueiros, MDSanta Clara, CA 950511790862647
  3. Sabrina SirabonianLoma Linda, CA 923501609524248
  4. Tammy Sirich, M.D.San Jose, CA 951281669628871
  5. Jennifer Sisco, MDOxnard, CA 930301366869471
  6. Matthew Sisitki, MDSan Diego, CA 921611063429579
  7. Andrew Siskind, M.D.Irvine, CA 926041619917663
  8. Lincoln Sison, M.D.San Leandro, CA 945771982990370
  9. Saly Sisouvong, M.D.Oakland, CA 946111407040991
  10. Lilybeth Sistoza, MDFontana, CA 923351538172358
  11. Amy Sitapati, MDSan Diego, CA 921031730261975
  12. Steve Sitar, M.DAnaheim, CA 928011700835360
  13. Karthikeyan Sitaraman, M.DKentfield, CA 949041902055320
  14. Christina Sitenga-Kako, M.D.Napa, CA 945581114996097
  15. Patricia Sitnitsky, M.D.Los Altos, CA 940241790896231
  16. Arun SitsabeshonSan Diego, CA 921031871432856
  17. Clare Siu, MDSan Francisco, CA 941181568579019
  18. Curtis Siu, MDLaguna Hills, CA 926531386613081
  19. Kasey Siu, DODowney, CA 902411447811559
  20. Patrick Siu, M.D.Camarillo, CA 930101629005475
  21. Kumarasamy Sivakumar, MDLancaster, CA 935341083762884
  22. Poopal Sivananda, MDBarstow, CA 923111518977099
  23. Ambika Sivanandam, MDLoma Linda, CA 923541801006606
  24. Janardan SivapalanRiverside, CA 925051891430393
  25. Ragu Sivarajan, D.O,.Fontana, CA 923361902246523
  26. Anita Sivasubramanian, M.D.Fresno, CA 937201447260328
  27. Baljit Sivia, M.D.Folsom, CA 956301518288398
  28. Gurjit Sivia, M.D.Loma Linda, CA 923541225474836
  29. James Siy, MDFolsom, CA 956301811075591
  30. George SkafRiverside, CA 925011396205035
  31. Aleksander Skarzynski, MDSacramento, CA 958231447275953
  32. Kelley Skeff, MDStanford, CA 943051467597484
  33. Mehdi Skhiri, MDStanford, CA 943051518105881
  34. Kalyn Skiles, D.O.Los Angeles, CA 900331235333030
  35. David Skinner, DOSouth Gate, CA 902801265489678
  36. Edwina Skinner, M.D.Camarillo, CA 930121063633170
  37. Lisa Skinner, MDLos Angeles, CA 900951265452460
  38. Gregory Skipper, M.D.Topanga, CA 902901720113418
  39. Irina Skokandic, M.D.San Pedro, CA 907311851377683
  40. Ana Skomal, MDStanford, CA 943051699478735
  41. Samuel Skootsky, MDLos Angeles, CA 900951205856804
  42. Lynnetta Skoretz, M.D.Moreno Valley, CA 925551023110343
  43. Marek Skowron, M.D.Modesto, CA 953551770548646
  44. Jacqueline Skvaril, M.D.Santa Rosa, CA 954031497748768
  45. Daniel Slack, MDFairfield, CA 945331952864027
  46. Margaret Slack, MDLos Angeles, CA 900951205576428
  47. George Slater, M.D.Walnut Creek, CA 945951891715611
  48. Madeline Slater, MDSan Francisco, CA 941161306045471
  49. Susan Slater, M.D.Ventura, CA 930031790041457
  50. Laura Slaughter, MDMorro Bay, CA 934421487640611

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.