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 27 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. Monica Thornhill-Joynes, MDMontebello, CA 906401548370638
  2. Brian ThorntonRoseville, CA 956611689625147
  3. Anthony Thu, MDSouth San Francisco, CA 940801093893653
  4. Steven Tilles, MDSan Jose, CA 951241841292745
  5. George Ting, MDMountain View, CA 940401104803097
  6. Herbert Tiquia, MDGarden Grove, CA 928431902875693
  7. Alfredo Tiu, D.O.San Diego, CA 921031043215502
  8. Irene Toh, M.D.Los Angeles, CA 900151679613863
  9. Fadi Tohme, MDLos Angeles, CA 900331336437730
  10. Steven Tolkan, MDFairfield, CA 945331871554766
  11. James Tomas, MDSan Bernardino, CA 924041902040819
  12. Eric Tong, MDWoodland Hills, CA 913671902954993
  13. Li-Li Tong, M.D.Torrance, CA 905021316034192
  14. Sam Tonthat, D.O.Fresno, CA 937011699139782
  15. Karo Torosian, D.OLa Jolla, CA 920371275822082
  16. Edgar Toscano, MDMontebello, CA 906401972532042
  17. Ngoc-Tram Tran, D.OLong Beach, CA 908061003052739
  18. Steve Tran, MDMission Viejo, CA 926911487722732
  19. Richard Treger, M.D.Sylmar, CA 913421194922625
  20. Danuta Trzebinska, M.D.San Diego, CA 921031629125042
  21. Wayne Tsang, M.D.Torrance, CA 905051588707194
  22. Dennis Tse, M.D.Lancaster, CA 935341447360508
  23. Ka-Lok Tse, M.D.Pasadena, CA 911051093730491
  24. Phillip Tse, M.D.San Jose, CA 951281184732901
  25. Glory Tseng, D.O.Los Angeles, CA 900481417342734
  26. Robert Tseng, MDDaly City, CA 940151053371559
  27. Cynthia Tsui, MDFremont, CA 945381942476940
  28. Thuc Tu, MDLong Beach, CA 908061699979229
  29. Sein Tun, DOLos Angeles, CA 900891003591835
  30. Delphine Tuot, MDSan Francisco, CA 941431700085586
  31. Stephen Turitzin, MDModesto, CA 953551821047382
  32. Philip Tuso, MDPanorama City, CA 914021356418214
  33. Igwe Ukoha, M.D.,Beverly Hills, CA 902111679553291
  34. Stefan Unterhalter, M.D.Beverly Hills, CA 902111619023249
  35. Iris Jill Uy, M.D.Bakersfield, CA 933081033561204
  36. Erlinda Uy - Concepcion, M.D.Upland, CA 917861194742775
  37. Payman Vahedifar, M.DLos Angeles, CA 900481275522096
  38. Chirag Vaidya, MDUpland, CA 917861073654570
  39. John Valdin, MDWalnut Creek, CA 945961609954767
  40. Aziz Valika, MDConcord, CA 945201992910954
  41. Rangashree Varadarajan, MDHayward, CA 945451164884623
  42. Laalasa Varanasi, M.D.San Francisco, CA 941431750778775
  43. Etienne Vasconcellosde Macedo, MDSan Diego, CA 921031265951172
  44. Tania Vashistha, MD.Mission Hills, CA 913451790080810
  45. Nosratola Vaziri, MDOrange, CA 928681710071089
  46. Ravikiran Vegasana, M.D.Modesto, CA 953501770738825
  47. Nirupama Vemuri, MDPorterville, CA 932571659303980
  48. Edgard Vera Tapia, MDVictorville, CA 923951235127515
  49. Meenakshi Verma, M.DLos Alamitos, CA 907201942463427
  50. Sunita Verma, M.D.Modesto, CA 953551720378581

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.