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 2 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. Vidya Bobba, M.D.Redding, CA 960011659370799
  2. Lisa Boohar, MDRedwood City, CA 940621063403707
  3. Lauren Boreta, M.D.San Francisco, CA 941431679990071
  4. Leslie Botnick, M.D.Sherman Oaks, CA 914111275530917
  5. Marc Botnick, MDTarzana, CA 913561033192844
  6. Armand Bouzaglou, M.DDowney, CA 902411457430399
  7. Constance Bowie, MDSan Jose, CA 951281699831420
  8. Scott Bratman, MD, PHDStanford, CA 943051164737318
  9. Steve Braunstein, MD, PHDSan Francisco, CA 941431760610141
  10. Andrew Bruggeman, M.D.Chula Vista, CA 919111790049591
  11. Edward Brunngraber, MDLos Angeles, CA 900271891866877
  12. Darlene Bugoci, M.D.Los Angeles, CA 900271295980308
  13. Jeffrey Burkeen, M.D.Rancho Mirage, CA 922701073932877
  14. Christiane Burnison, MDWest Hollywood, CA 900481366492498
  15. David Bush, M.D.Loma Linda, CA 923541114944782
  16. Santino Butler, MDStanford, CA 943051588291447
  17. Mark Buyyounouski, M.D.Stanford, CA 943051912927021
  18. John Byun, MDStanford, CA 943051528487089
  19. Benjamin Cahan, M.D.South Pasadena, CA 910301396034229
  20. Haocheng Cai, DO, PHDTurlock, CA 953821548882632
  21. Richard Carmel, MDConcord, CA 945201902897317
  22. Ruben Carmona, MDChula Vista, CA 919111275929242
  23. Joseph Castro, M.D.San Rafael, CA 949011568708113
  24. Lisa Chaiken, MDSanta Monica, CA 904041528062023
  25. Linda Chak, M.D.San Marino, CA 911081275734956
  26. Esmond Chan, M.D.Salinas, CA 939011083612626
  27. Jason Chan, M.D.San Francisco, CA 941151033536917
  28. Linda Chan, M.D.Laguna Hills, CA 926531083844427
  29. Albert Chang, MD PHDLos Angeles, CA 900241104089267
  30. Andrew Chang, M.D.San Diego, CA 921211255513859
  31. Eric Chang, M.D.Los Angeles, CA 900891306930342
  32. Garrick Chang, M.D.Sacramento, CA 958161952308041
  33. Tangel ChangLos Gatos, CA 950321306194915
  34. Christine Chang-Halpenny, M.D.Fresno, CA 937201760776744
  35. Kuang-Hwa Chao, M.D.Walnut Creek, CA 945981073721569
  36. Cynthia Chasan, MDLa Jolla, CA 920371922450840
  37. Brittney Chau, MDLos Angeles, CA 900331558011676
  38. Rishabh Chaudhari, MDStanford, CA 943051295155422
  39. Barry Chauser, MDSan Francisco, CA 941151902897515
  40. Allan Chen, M.D.Roseville, CA 956781174506406
  41. Allen Chen, M.D.Orange, CA 928681518992981
  42. Chien Chen, M.D., PH.D.La Jolla, CA 920371083947717
  43. Eric Chen, MDOrange, CA 928681578126124
  44. Helen Chen, MDSouth Pasadena, CA 910301578546388
  45. Michael Chen, M.D.Santa Rosa, CA 954091417104720
  46. Peter Chen, MDNewport Beach, CA 926631720031800
  47. Victor Chen, MD, MPHSan Francisco, CA 941431912433632
  48. William Chen, MDSan Francisco, CA 941151316566367
  49. William Chen, MDSan Francisco, CA 941431417452251
  50. Yi-Jen Chen, MDDuarte, CA 910101972698868

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.