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 334 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. Benjamin WatermanLos Angeles, CA 900951740623008
  2. Gabriel Waterman, MD, MBALong Beach, CA 908061639556434
  3. David Waters, MDSan Francisco, CA 941101508808122
  4. Morgan Waters, MDSacramento, CA 958231851479513
  5. Susan Waters, M.D.Kentfield, CA 949041629005772
  6. Elaine Watkins, D.OSan Diego, CA 921101225019557
  7. Harlan Watkins, M.D.San Francisco, CA 941091811074008
  8. Alexander Watson, M.D.Orange, CA 928681679733398
  9. Kira Watson, M.D., M.P.HLos Angeles, CA 900331366829475
  10. Matthew Watson, M.D., M.P.H.Gilroy, CA 950201447468210
  11. Ronald Watson, MDMountain View, CA 940401730295049
  12. Sarah Watson, MDMenlo Park, CA 940251932162328
  13. Thomas Watson, M.D.Santa Rosa, CA 954031720349061
  14. Mridula WattBeverly Hills, CA 902101144484973
  15. Neil Watter, MDVallejo, CA 945891891873626
  16. Brenda Watts, M.D.National City, CA 919501407168669
  17. Eli Watts, MDSan Diego, CA 921141649373739
  18. Edgar Wayne, M.D.Mission Viejo, CA 926911508026766
  19. Jeffrey Wayne, MDLincoln, CA 956481689750325
  20. John WearSan Marino, CA 911081255080198
  21. Richard Wear, MDPasadena, CA 911011700850633
  22. Sandra Weatherby, MDOakland, CA 946111609954494
  23. Henry Weaver, MDSan Diego, CA 921341922758036
  24. Jonathan Weaver, MDSanta Monica, CA 904031851318331
  25. Michael Weaver, MDMartinez, CA 945531356429435
  26. Ronald Weaver, M.D.Inglewood, CA 903011669465928
  27. Melvin Webb, M.D.Victorville, CA 923951093764151
  28. Douglas Webber, M.D.Los Angeles, CA 900391497783708
  29. Ellen Weber, M.D.San Francisco, CA 941431447209226
  30. John Weber, MDSan Diego, CA 921201205903127
  31. Robert Weber, MD, PHDPalo Alto, CA 943011497217913
  32. Maria Webster-Longin, MDOakland, CA 946011134229388
  33. Laura Wedderburn, M.D.Oakland, CA 946091912981788
  34. Stefani Wedl, MDCastro Valley, CA 945461073538518
  35. Mark Weeber, MDChico, CA 959261144324492
  36. Sashini Weeraman, MDSanta Ana, CA 927071376123711
  37. Lihini Weerasinghe, MDRiverside, CA 925011588240469
  38. Douglas Weese, MDPanorama City, CA 914021225186141
  39. Alan WeiLoma Linda, CA 923541760825517
  40. Erman Wei, M.D.San Diego, CA 921111992094973
  41. Hongsheng Wei, MDArcadia, CA 910071689694580
  42. Jennie Wei, M.D.San Diego, CA 921311053690974
  43. Jiandong Wei, MDSonora, CA 953701063788222
  44. John Wei, M.D.South Gate, CA 902801689741654
  45. Margaret Wei, M.D.West Hollywood, CA 900481629426077
  46. Shuang Wei, MDMilpitas, CA 950351770660623
  47. Hsuan Wei-Zee, M.D.Baldwin Park, CA 917061639376312
  48. Benjamin Weia, MDStanford, CA 943051316441694
  49. Franklin Weil, M.D.Thousand Oaks, CA 913601740234640
  50. Amy Weimer, M.D.Santa Monica, CA 904041396713426

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.