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 339 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. Robert Winters, MDLos Angeles, CA 900691942791785
  2. Todd Winters, MDSacramento, CA 958231255419982
  3. Carl Winterstein, MDPalo Alto, CA 943061235207432
  4. Robert Wintroub, MDLos Angeles, CA 900491013020908
  5. Melanie Wise, MDFontana, CA 923351447834841
  6. Melanie Wiseman, MDSan Diego, CA 921341376047001
  7. Glen Wishon, M.D.Redondo Beach, CA 902771447365150
  8. Barbara Wismer, MD, MPHSan Francisco, CA 941021972620342
  9. Morris Wisniewski, M.D.Vista, CA 920831639112246
  10. Warren Wisnoff, DOBakersfield, CA 933081619956927
  11. Julie Wissink, M.D.Palo Alto, CA 943011386738623
  12. Emily Wistar, MDSan Francisco, CA 941431063774883
  13. Sarath Witana, M.D.Moreno Valley, CA 925531801960646
  14. Izabela Witczak, M.DSan Marcos, CA 920691184735201
  15. Agnieszka Witkowski, M.D.Sacramento, CA 958171043486897
  16. Steven Witlin, M.D.Culver City, CA 902321841340452
  17. Amy Witman, M.D.San Diego, CA 921301679670327
  18. Daniel Wittkop, MDSacramento, CA 958251730267410
  19. Richard Wittman, MDStanford, CA 943051235296229
  20. Karl Wittnebel, MDLos Angeles, CA 900481649263591
  21. Daniel Wlodarczyk, MDSan Francisco, CA 941101700993524
  22. Elizabeth Wobus, MDPenn Valley, CA 959461770673493
  23. Judith Wofsy, MDOakland, CA 946021285644872
  24. Joe Wohlmuth, MDFontana, CA 923351528116308
  25. Nora Woiwode, MDSunnyvale, CA 940861033205778
  26. Scott Wojtowich, DOFontana, CA 923351790833515
  27. Bisrat Woldemichael, MDMarysville, CA 959011568022663
  28. Amy Wolf, M.D.Sacramento, CA 958171104976174
  29. Carl Wolf, M.D.Davis, CA 956161508179219
  30. Marvin Wolf, M.D.Los Angeles, CA 900491669704763
  31. Elliott Wolfe, M.D.Palo Alto, CA 943031265597926
  32. Brett Wolff, MDSan Carlos, CA 940701093875197
  33. Gregg Wolff, MDPalm Springs, CA 922641861461352
  34. Lisa Woll, MDWalnut Creek, CA 945981386716033
  35. Carl Wolnisty, M.D.Riverside, CA 925031912906140
  36. Eleanore Wolpaw, M.D.Sacramento, CA 958161982686432
  37. Paul Wolters, MDSan Francisco, CA 941431861443731
  38. Stacy Womack Batzdorf, M.D.Sherman Oaks, CA 914231881809218
  39. Christine Won, M.D.Pasadena, CA 911051750350252
  40. Alan Wong, M.D.Saratoga, CA 950701548312283
  41. Alexander Wong, MDSunnyvale, CA 940861982072351
  42. Alice Wong, MDIrvine, CA 926971295801546
  43. Alvin Wong, M.D.San Francisco, CA 941181568443307
  44. Andrea Wong, M.D.Napa, CA 945581841229317
  45. Anthony Wong, MDIrvine, CA 926041104808443
  46. Arthur Wong, MDSan Diego, CA 921041023639176
  47. Ashleigh Wong, DOFresno, CA 937011831848225
  48. Ben Wong, MDSan Jose, CA 951281174619811
  49. Brian Wong, MDRiverside, CA 925051497803332
  50. Candice Wong, M.D., PH.D.Berkeley, CA 947041144455437

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.