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 14 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. Karen Tye, MDSan Diego, CA 921031225490147
  2. Barry Uhl, MDLa Mesa, CA 919421811936693
  3. James Urbanic, M.D.Encinitas, CA 920241164607875
  4. Siavosh Vakilian, MDSan Diego, CA 921031427456151
  5. Richard Valicenti, M.D.Sacramento, CA 958171235152232
  6. Luca Valle, MDLos Angeles, CA 900951982139499
  7. Carl Van Wey, M.D.Dublin, CA 945681922071844
  8. Jonathan Vanwickle, MDSanta Maria, CA 934541811493737
  9. April Vassantachart, MDSherman Oaks, CA 914111962992610
  10. Harish Vasudevan, MD, PHDSan Francisco, CA 941431215460753
  11. Danny Vazquez, MDVisalia, CA 932771730747791
  12. Puja Venkat, M.D.Los Angeles, CA 900951144587742
  13. Nicholas Verdini, MDPalo Alto, CA 943041689428088
  14. Paul Volpp, MDEscondido, CA 920291225186232
  15. Dan Vongtama, M.D.Stockton, CA 952071245434083
  16. Roy Vongtama, M.D.Los Angeles, CA 900951083837058
  17. Vitune Vongtama, MDStockton, CA 952071598793507
  18. Justin Voog, M.D., PH.D.Santa Barbara, CA 931051396001152
  19. Nayana Vora, MDDuarte, CA 910101275639791
  20. Steven Wahlen, M.D.Chico, CA 959261457308769
  21. Charles Wang, MD / PHDSacramento, CA 958171710650411
  22. Ricardo Wang, MDLos Angeles, CA 900271639239833
  23. William Wara, M.D.San Francisco, CA 941151831131754
  24. Tara Washington, MDTemecula, CA 925921780621276
  25. Jonathan Waxer, MDLos Angeles, CA 900271629575337
  26. Randy Wei, M.D., PH.D.Long Beach, CA 908221790045714
  27. Jorge Weibel, M.D.Trinidad, CA 955701356594923
  28. Michael Weil, MDUkiah, CA 954821801322268
  29. Geoffrey Weinstein, MDSan Diego, CA 921231841233947
  30. Stephen Weller, MDMountain View, CA 940401154312890
  31. Julius Weng, M.D.Irvine, CA 926181174084610
  32. Matthew Wheatley, M.D.Carmichael, CA 956081659514701
  33. Evan White, M.D.Chula Vista, CA 919141063701407
  34. Ellen Wiegner, MDSacramento, CA 958161831379122
  35. Charles Wilkinson, M.D.Marysville, CA 959011588671713
  36. John Wilkinson, M.D.Lompoc, CA 934361568621803
  37. Terence Williams, M.D.Duarte, CA 910101003939133
  38. Venita Williams, MDOrange, CA 928681659581775
  39. Ruth Williamson, MDPasadena, CA 911051952486912
  40. Rosemonde Woel, M.D.El Centro, CA 922431538159694
  41. Harvey Wolkov, MDSacramento, CA 958161164420808
  42. Robert Wollman, MDSanta Monica, CA 904041437134665
  43. Andrew Wong, MDSacramento, CA 958171700316916
  44. Anthony Wong, MD, PHDSan Francisco, CA 941431285991430
  45. Gordon Wong, M.D.Los Gatos, CA 950321235172446
  46. Jason Wong, MDOrange, CA 928681548426018
  47. Jeffrey Wong, MDDuarte, CA 910101699707893
  48. Kenneth Wong, MDLos Angeles, CA 900891184628695
  49. Michael Wong, M.D.Los Angeles, CA 900951649505975
  50. Winnifred Wong, DOTravis Afb, CA 945351144554148

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.