NPPES file of Aug 9, 2026

Nephrology Physician in California

1,468 NPPES records list nephrology physician with a practice address in California, 3.8 per 100,000 residents, the 22nd highest rate of 51. Los Angeles and San Diego have the most; each record links to the provider's NPI and the California license search. Page 29 of 30.

CMS NPPES registry, file of Aug 9, 2026; 2023 Census estimates · NUCC 207RN0300X · 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, 151

  1. Los Angeles151
  2. San Diego75
  3. San Francisco70
  4. Sacramento57
  5. Stanford39

Nephrology Physician records in California

  1. Johan Winoto, M.D.Elk Grove, CA 957581780635920
  2. Irma Wisener, NPFresno, CA 937111265602775
  3. Christopher Woehrstein, M.D.Inglewood, CA 903011053545129
  4. Anthony Wolfe, MDSan Luis Obispo, CA 934051477637783
  5. Bryan Wong, MDBerkeley, CA 947051407953755
  6. Calbert Wong, M.D.Camarillo, CA 930101902805294
  7. Caroline Wong, MDBakersfield, CA 933011174625008
  8. Christopher Wong, DOSan Dimas, CA 917731881985612
  9. Clifford Wong, MDHayward, CA 945451780621706
  10. Ing Wong, MDLos Alamitos, CA 907201053408435
  11. Samuel Wong, DOBerkeley, CA 947051215034905
  12. Patarapha Wongsaroj, M.D.Los Angeles, CA 900481174753784
  13. Tyler Woodell, MDSan Diego, CA 921031528322393
  14. Sarah Woon, M.D.Concord, CA 945201629094560
  15. Elizabeth Wrone, MDWalnut Creek, CA 945981326049115
  16. Dennis Wu, MDModesto, CA 953561114063716
  17. Monte Wu, MDBerkeley, CA 947051902903578
  18. Guoping Xu, MDOakland, CA 946111932271681
  19. Hui Xue, MDSan Diego, CA 921231255508834
  20. Julie Yabu, MDLos Angeles, CA 900951801840053
  21. Dean Yamaguchi, M.D., PH.D.Los Angeles, CA 900731578516662
  22. Eric YanMenifee, CA 925861225115892
  23. Jie Shi Yan, M.D.Simi Valley, CA 930651396744546
  24. Malvin Yan, D.O.South Gate, CA 902801033153101
  25. Norimoto Yanagawa, M.D.Pacific Palisades, CA 902721891085957
  26. Sita Yanamadala, M.D.Lynwood, CA 902621821049255
  27. Philip Yang, MDFountain Valley, CA 927081821157553
  28. Sung Yang, MDLancaster, CA 935341871562900
  29. Tom Yang, M.D.Visalia, CA 932771548346695
  30. Wan-Ting Yang, M.D.Los Angeles, CA 900271225238470
  31. William Yang, M.D.Northridge, CA 913251609005479
  32. Leonid Yankulin, MDSan Francisco, CA 941151326126962
  33. Andrea Yao, M.D.Hayward, CA 945451740354059
  34. Michael Yap, M.D.Orange, CA 928681588847362
  35. Roshini YapaMonterey, CA 939401205254695
  36. Padma Yarlagadda, M.D.San Jose, CA 951161942233580
  37. Nasimeh Yazdani, M.D.Santa Monica, CA 904031154376580
  38. Mahdi Yazdany, M.D.Torrance, CA 905051316109911
  39. Maian Ye, DOSan Francisco, CA 941081912198110
  40. Khin Yee, M.D.Fresno, CA 937101720377070
  41. Aditya Yelamanchi, DOSacramento, CA 958171346985744
  42. Hock Yeoh, MDLos Angeles, CA 900271568521177
  43. Jane Yeun, M.D.Sacramento, CA 958171811972417
  44. Aaron YoungVacaville, CA 956871942705827
  45. Brian Young, M.D.Sacramento, CA 958171588871990
  46. Jeffry Young, MDSan Jose, CA 951281033205604
  47. Nadia Yousef, MDModesto, CA 953551053654343
  48. Amr Youssef, DOPalm Springs, CA 922621093121386
  49. Nick Youssefi, D.O.Sacramento, CA 958231518259415
  50. Anne Yu, MDSan Leandro, CA 945781114283314

Source: CMS NPPES, primary taxonomy 207RN0300X: records by practice city and the list of records, file of Aug 9, 2026.

California ranks 22 of 51 per resident

  1. Texas3.8
  2. Virginia3.8
  3. Georgia3.8
  4. California3.8
  5. South Carolina3.8
  6. Michigan3.7
  7. 50 states and D.C.4.0

Source: CMS NPPES, primary taxonomy 207RN0300X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.

88.2% of these records appear in a Medicare file, against 85.8% 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. California88.2%
  2. United States85.8%

Nephrology Physician records in California, measured

  • In a Medicare file1,295 of 1,468 · 88.2% here, 85.8% nationally
  • In the CMS Doctors and Clinicians file1,128 · 76.8% here, 76.0% nationally
  • Not updated in five years or more909 · 61.9% here, 54.9% nationally
  • Median graduation year2001 · the 1,128 records with a school on file

Source: CMS NPPES, file of Aug 9, 2026 (primary taxonomy 207RN0300X); CMS Medicare Part D Prescribers 2024, MIPS 2023, Open Payments 2024 and Doctors and Clinicians, matched by NPI.

What the count covers

1,468 NPPES records list nephrology physician (207RN0300X) as their primary taxonomy with a practice address in California: 3.8 per 100,000 residents against 4 nationally (50 states and D.C.). Los Angeles has 151 of them (10%).

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. Texas1,159
  2. New York1,049
  3. Florida840
  4. Pennsylvania651

States with a similar rate per 100,000

  1. South Carolina3.8
  2. Georgia3.8
  3. Virginia3.8
  4. Michigan3.7

The largest states

  1. Texas1,159
  2. New York1,049
  3. Florida840
  4. Pennsylvania651
  5. Illinois572

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.