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 4 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. Ly Do, M.D.San Jose, CA 951161376706929
  2. Tri Do, MDSan Jose, CA 951291619930260
  3. Stephen Doggett, M.D.Newport Beach, CA 926601982675021
  4. Dechen Dolkar, MDFullerton, CA 928351861475683
  5. Sarah Donaldson, M.D.Stanford, CA 943051033276316
  6. Anna Dornisch, MDSan Diego, CA 921031659957017
  7. Morteza Dowlatshahi, M.D.San Jose, CA 951161437112158
  8. Elizabeth Dubose, M.D.San Jose, CA 951281124081245
  9. Paul Duong, M.D.Los Angeles, CA 900951790750768
  10. Sai DurisetiLos Angeles, CA 900731205298924
  11. Sharon Dutton, M.D.Sunnyvale, CA 940861871591743
  12. Michael Dworkin, MDSanta Cruz, CA 950651922505924
  13. David Eastham, MD, MPHTravis Afb, CA 945351356412050
  14. Boryana Eastman, M.D., PH.D.Lancaster, CA 935341316301948
  15. John Einck, MDRancho Mirage, CA 922701831133321
  16. Nancy EllerbroekValencia, CA 913551821071507
  17. Hany Elsaleh, MDLos Angeles, CA 900951639104623
  18. Thyra Endicott, MDRedondo Beach, CA 902771023039948
  19. Nicholas Eustace, MD PHDSan Francisco, CA 941431285210831
  20. Richard Evans, MDGrass Valley, CA 959451649344953
  21. Michael Faer, M.D.Oakland, CA 946091932192242
  22. Leonard Farber, M.D.Fullerton, CA 928351639185838
  23. Hanako Farol, D.O.Los Angeles, CA 900271013201789
  24. Matthew FarrellLos Angeles, CA 900951972019552
  25. Shera Feinstein, MDOrange, CA 928681437600194
  26. Chu-Pei Feng, M.D.Santa Ana, CA 927051922010073
  27. Mary Feng, M.D.San Francisco, CA 941431720106693
  28. Marc Fields, MDRohnert Park, CA 949281730143066
  29. Benjamin Fisch, MDSanta Clara, CA 950511922185859
  30. Robert Fishburn, MDSan Luis Obispo, CA 934051508858465
  31. Monte Fisher, MDSan Francisco, CA 941221164442497
  32. Charles Fiske, M.D.Oakland, CA 946091013900331
  33. Christopher Fleming, MDSacramento, CA 958161245684158
  34. Yeeyie Fogarty, M.D.San Leandro, CA 945771063586675
  35. Thomas Fogel, MDVentura, CA 930031619969524
  36. Judith Ford, MDLos Angeles, CA 900951982638565
  37. Michael Forrest, MDDublin, CA 945681700859352
  38. Croix Fossum, M.D.San Diego, CA 921231104351006
  39. Barbara Fowble, M.D.San Francisco, CA 941431881623866
  40. Ruben Fragoso, MD, PHDSacramento, CA 958171417154436
  41. Donald Fuller, M.D.San Diego, CA 921031285632711
  42. Arash Gabayan, M.D.Beverly Hills, CA 902111497867717
  43. Ramesh Gadam, M.D.Mountain View, CA 940401679897284
  44. Diana Gage, M.D., PH.D.Los Angeles, CA 900731538398417
  45. Bhavani Gannavarapu, M.D.Napa, CA 945581730536988
  46. Jorge Garcia-Young, M.D.Modesto, CA 953551902860802
  47. Adam Garsa, M.D.Los Angeles, CA 900891306008768
  48. Thomas Gates, MDLong Beach, CA 908131023072915
  49. Geoffrey Geiger, MDCovina, CA 917231285836619
  50. Alexander Geng, M.D.San Francisco, CA 941091790066090

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.