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 3 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. George Cheng, M.D.Santa Barbara, CA 931051750437745
  2. Karen Cheng, M.D.Riverside, CA 925061316407422
  3. Sravana Chennupati, MDPleasant Hill, CA 945231609193226
  4. Joel Cherlow, M.D., PH.D.Laguna Hills, CA 926531194736710
  5. Henry Chessin, M.D.San Diego, CA 921011235320342
  6. Jessica ChewSan Francisco, CA 941431508391731
  7. Alexander Chin, MDPalo Alto, CA 943041518385251
  8. Robert Chin, MD, PHDLos Angeles, CA 900951043407992
  9. Daniel Chinn, MDConcord, CA 945201063493757
  10. Stanley Chism, M.DPalo Alto, CA 943061154557536
  11. Nam Cho, M.D., PH.D.Stanford, CA 943051669668323
  12. Nam Woo Cho, MDPHDSan Francisco, CA 941151811420052
  13. Jennie Cho-Lim, M.D.Lawndale, CA 902601235372798
  14. Clara Choi, M.D., PH.D.San Mateo, CA 944031225236649
  15. Hailey Choi, M.D.Palo Alto, CA 943041386900249
  16. Jehee Choi, MDSan Diego, CA 921211619260056
  17. Brian Chou, MDSan Diego, CA 921211770070609
  18. Rachel Chou, MDRancho Cordova, CA 956701740244094
  19. William Chou, MDMission Viejo, CA 926911790713253
  20. James Chuang, MDArcadia, CA 910071720195977
  21. Arthur Chung, MDWest Covina, CA 917921295026102
  22. Christine Chung, M.D.Pleasant Hill, CA 945231346438256
  23. Eric ChungWest Hollywood, CA 900481043771041
  24. Michael Clarke, M.D.Stanford, CA 943051659553329
  25. Gregory Colburn, MDSan Jose, CA 951281538235056
  26. Lori Coleman, MDSan Diego, CA 921231053348920
  27. Dylan Conroy, MDSanta Maria, CA 934541942761812
  28. Harry Cosmatos, MDLos Angeles, CA 900271902977978
  29. Nina Cote, MDMission Hills, CA 913451396131439
  30. Shane Cotter, M.D.Santa Barbara, CA 931051467643718
  31. Craig Cox, MDNewport Beach, CA 926631134172398
  32. Megan Daly, M.D.Orange, CA 928681780863340
  33. Savita Dandapani, M.D. , PH.D.Duarte, CA 910101619141751
  34. Parima Daroui, M.D. PH.D.Wildomar, CA 925951629283841
  35. Giatri Dave, MDFresno, CA 937201316901663
  36. Sulabha Dave, MDLong Beach, CA 908051821191446
  37. Frederick David, M.D.Santa Rosa, CA 954031982793808
  38. Dean Davis, M.D.Bakersfield, CA 933011619996139
  39. Ronald Davis, M.D.San Diego, CA 921011184622532
  40. Steven Davis, M.D.Orange, CA 928681558463653
  41. Anne Dawson, M.D.Chico, CA 959261902847981
  42. Kevin Day, MDStanford, CA 943051699030577
  43. Regiane De Andrade, M.D.Fountain Valley, CA 927081922352467
  44. David Demanes, M.D.Los Angeles, CA 900951407914757
  45. Jie Deng, MDPHDLos Angeles, CA 900951851889562
  46. Mary Denk, M.D.North Hollywood, CA 916061538282512
  47. Ajay Desai, M.D.Bakersfield, CA 933091124015706
  48. Kelly Dewitt, MDLa Mesa, CA 919421184668741
  49. Kevin Diao, MDWhittier, CA 906061578067260
  50. Maximilian Diehn, M.D./PH.D.Stanford, CA 943051174719850

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.