NPPES file of Aug 9, 2026

Radiation Oncology Physician in California

735 NPPES records list radiation oncology physician with a practice address in California, 1.9 per 100,000 residents, the 33rd 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 12 of 15.

CMS NPPES registry, file of Aug 9, 2026; 2023 Census estimates · NUCC 2085R0001X · 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, 98

  1. Los Angeles98
  2. San Francisco44
  3. San Diego43
  4. Stanford43
  5. Sacramento32

Radiation Oncology Physician records in California

  1. Rachel Sabol, MD, PHDSan Francisco, CA 941431497331284
  2. Gopal Sachdeva, MDEmeryville, CA 946081447449509
  3. Ahmad Sadeghi, M.D.Los Angeles, CA 900731346351798
  4. Afshin Safa, MDLos Angeles, CA 900951790789287
  5. Sander Saidman, M.D.Redding, CA 960011467478875
  6. Catherine Salem, M.D.Stanford, CA 943051578563383
  7. John Salzman, MDOakland, CA 946091457349342
  8. Sagus Sampath, M.D.Duarte, CA 910101568542785
  9. Ajay Pal Sandhu, M.D.La Jolla, CA 920931881610137
  10. Parag Sanghvi, M.D., M..S.P.H.San Diego, CA 921031801005152
  11. Samrat Sanghvi, M.D.Monterey, CA 939401811422637
  12. Julie Santelli, MDLos Angeles, CA 900891538117718
  13. Ricky Savjani, MD/PHDLos Angeles, CA 900951639663735
  14. Lawrence Scala, M.D.San Francisco, CA 941151487828539
  15. Cindy Scharfen, M.D.Santa Rosa, CA 954031861582322
  16. Randall Scharlach, MDWoodland Hills, CA 913671477545093
  17. Joshua Schiff, MDLos Angeles, CA 900891417516188
  18. Daniel Schiffner, M.D.Palo Alto, CA 943011972791671
  19. Derrick Schmidt, MDRancho Cordova, CA 956701215016928
  20. David Schreiber, M.D.Rancho Mirage, CA 922701154314227
  21. Andrew Schumacher, M.D.Torrance, CA 905051023457173
  22. Victor Schweitzer, MDValley Village, CA 916071922091263
  23. Amanda Schwer, MDIrvine, CA 926181780721043
  24. Stephen Seagren, M.D.La Jolla, CA 920931386692424
  25. Samantha Seaward, MDSanta Clara, CA 950511790862621
  26. Tyler Seibert, M.D., PH.D.San Diego, CA 921031679815963
  27. Patricia Seid, MDNapa, CA 945581710994520
  28. Michael Selch, MDLos Angeles, CA 900951558396556
  29. Yuji Seo, M.D.El Centro, CA 922431740493774
  30. Rajni Sethi, MDConcord, CA 945201639314446
  31. Steven Seyedin, M.D.San Francisco, CA 941431134513450
  32. Amish Shah, M.D.Dublin, CA 945681629129341
  33. Sayana Shah, M.D.Long Beach, CA 908131972793917
  34. Brenda Shank, MD, PHDSan Pablo, CA 948061710037536
  35. Andrew Sharabi, M.D., PH.D.San Diego, CA 921031043531213
  36. Michael Sherer, MDSan Diego, CA 921031932606902
  37. Madhu Shetti, M.D.San Pablo, CA 948061780885517
  38. Tommy Sheu, MDFullerton, CA 928351568880060
  39. Kenneth Shimizu, M.D.San Diego, CA 921211326032129
  40. Samuel Shin, MDLos Angeles, CA 900271669762845
  41. Reza Shirazi, M.D.San Diego, CA 921031336175272
  42. David Shultz, M.D.Palo Alto, CA 943011396989711
  43. Chad Sila, M.D.Lawndale, CA 902601477744811
  44. William Silveira, MDClovis, CA 936111447494398
  45. Maira Simental, MDSan Bernardino, CA 924041891779997
  46. Thomas Simko, MDTorrance, CA 905051558382465
  47. Aaron Simon, MD, PHDOrange, CA 928681801250550
  48. Daniel Simpson, M.D.La Jolla, CA 920931689974883
  49. Lisa SingerSan Francisco, CA 941431457619652
  50. Charu Singh, M.D.Ventura, CA 930031841741212

Source: CMS NPPES, primary taxonomy 2085R0001X: records by practice city and the list of records, file of Aug 9, 2026.

California ranks 33 of 51 per resident

  1. Kentucky1.9
  2. Maine1.9
  3. Colorado1.9
  4. California1.9
  5. Nebraska1.9
  6. Tennessee1.9
  7. 50 states and D.C.2.1

Source: CMS NPPES, primary taxonomy 2085R0001X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.

82.9% of these records appear in a Medicare file, against 82.3% 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. California82.9%
  2. United States82.3%

Radiation Oncology Physician records in California, measured

  • In a Medicare file609 of 735 · 82.9% here, 82.3% nationally
  • In the CMS Doctors and Clinicians file545 · 74.1% here, 74.0% nationally
  • Not updated in five years or more406 · 55.2% here, 54.6% nationally
  • Median graduation year2005 · the 545 records with a school on file

Source: CMS NPPES, file of Aug 9, 2026 (primary taxonomy 2085R0001X); CMS Medicare Part D Prescribers 2024, MIPS 2023, Open Payments 2024 and Doctors and Clinicians, matched by NPI.

What the count covers

735 NPPES records list radiation oncology physician (2085R0001X) as their primary taxonomy with a practice address in California: 1.9 per 100,000 residents against 2.1 nationally (50 states and D.C.). Los Angeles has 98 of them (13%).

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. Florida520
  2. New York449
  3. Texas449
  4. Pennsylvania383

States with a similar rate per 100,000

  1. Colorado1.9
  2. Nebraska1.9
  3. Tennessee1.9
  4. Delaware1.8

The largest states

  1. Florida520
  2. New York449
  3. Texas449
  4. Pennsylvania383
  5. Ohio298

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.