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 23 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. Maria Carmela Rosales, M.D.San Jose, CA 951161780706762
  2. Andrew Ross, M.D.Orange, CA 928681932543998
  3. Jamie Ross, M.D.Sacramento, CA 958171427080175
  4. Oliver RossIrvine, CA 926181215228762
  5. Carol Ross-McCormick, RN, NPFresno, CA 937201194962266
  6. Leon Rovner, M.D.Los Angeles, CA 900151811013766
  7. Atul Roy, M.D.Merced, CA 953481467496505
  8. Tamara Rubenzik, M.D.San Diego, CA 921031811200652
  9. Jack Rubin, M.D.Inglewood, CA 903011346236205
  10. Oleg Rubin, MDFairfield, CA 945341790762763
  11. Mark Rutkowski, MDBaldwin Park, CA 917061760553721
  12. Michael Rutten, M.D.Orange, CA 928681841259041
  13. Tagumpay Sacamay, M.D.National City, CA 919501407851041
  14. Hamid Sadeghi, M.D.Van Nuys, CA 914051184624785
  15. Oday Saeed, M.D.San Diego, CA 921151639432164
  16. P Sagireddy, MDStockton, CA 952101407844889
  17. Nima Sahami, MDLos Angeles, CA 900481871029363
  18. Akber Saifullah, M.D.Palm Springs, CA 922621780747782
  19. Nourma Sajid, M.D.Long Beach, CA 908061952808925
  20. Bernard Salick, M.D.,Beverly Hills, CA 902121629167861
  21. Ramin Sam, M.D.San Francisco, CA 941101790794873
  22. Marcelo Sampaio, M.D.Los Angeles, CA 900731851701221
  23. Maria Samsonov, M.D., M.P.H.San Francisco, CA 941091598737025
  24. Amber Sanchez, M.D.San Diego, CA 921031700963907
  25. Neysha Sanchez Rivera, M.D.Fresno, CA 937201629481569
  26. Amarpreet Sandhu, D.O.San Jose, CA 951181912226002
  27. Rana SandhuWest Hollywood, CA 900481619387198
  28. Saeed Sandhu, MDFresno, CA 937201841378759
  29. Josephus-Ian Sanjorjo, MDDaly City, CA 940151073808168
  30. Rallabhandi Sankaram, M.D.Fountain Valley, CA 927081710090766
  31. Hector Santiesteban, MEDICAL DOCTORDaly City, CA 940151245235738
  32. Jose Santos, M.D.Modesto, CA 953501073577573
  33. Saman Sarani, M.D.Upland, CA 917861124333141
  34. Harini Sarathy, MBBSSan Francisco, CA 941101063773034
  35. Mona Sarbu, MDChico, CA 959731639250855
  36. Mrinalini Sarkar, MDWest Hollywood, CA 900481932362514
  37. Kristine Sarmosyan, M.D.Burbank, CA 915051851705511
  38. Steven Sawelson, MDTorrance, CA 905031740354034
  39. Ajit Sawhney, M.D.Fountain Valley, CA 927081114014438
  40. Sajeet Sawhney, M.D.Fountain Valley, CA 927081003131228
  41. Anjali Saxena, MDSan Jose, CA 951281164527826
  42. Nishkarsh Saxena, MDFresno, CA 937201548524408
  43. John Scandling, M.D.Stanford, CA 943051174665020
  44. Brigitte Schiller-Moran, M.D.Mountain View, CA 940411205989639
  45. Amy Schuerman-Gen, M.D.Fresno, CA 937201043328545
  46. Carl Schulze, MDBurbank, CA 915051235456856
  47. Jeremy Schwieger, M.D.Tarzana, CA 913561164453437
  48. Jonathan Segal, MDMartinez, CA 945531780666164
  49. Bikram SekhonLakewood, CA 908051891039871
  50. Inderpreet Sekhon, MDGranite Bay, CA 957461720012883

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.