NPPES file of Aug 9, 2026

Medical Oncology Physician in California

447 NPPES records list medical oncology physician with a practice address in California, 1.1 per 100,000 residents, the 31st highest rate of 51. Stanford and San Francisco have the most; each record links to the provider's NPI and the California license search. Page 2 of 9.

CMS NPPES registry, file of Aug 9, 2026; 2023 Census estimates · NUCC 207RX0202X · method

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Stanford has the most, 82

  1. Stanford82
  2. San Francisco53
  3. Duarte48
  4. Los Angeles39
  5. San Diego19

Medical Oncology Physician records in California

  1. Michael Castro, M.D.Los Angeles, CA 900341306834338
  2. Jennifer Caswell-Jin, MDStanford, CA 943051437475092
  3. Edward Cha, M.D.San Francisco, CA 941431134330988
  4. Priyamvadha Chakravarthi, M.D.Stanford, CA 943051437148061
  5. Brent Cham, MDSanta Maria, CA 934541265061600
  6. Eric Chang, MDMonterey Park, CA 917541427123488
  7. Hannah Chang, MDDuarte, CA 910101811491426
  8. Ryan ChangSan Mateo, CA 944021164985263
  9. Joseph Chao, M.D.Duarte, CA 910101285831057
  10. Philip Chatham, M.D.San Gabriel, CA 917761740279264
  11. Amina Chaudhry, MDStanford, CA 943051336679166
  12. Aman Chauhan, MDSan Francisco, CA 941431902193147
  13. Alexander Chehrazi-Raffle, M.D.Duarte, CA 910101891157889
  14. Chien-Shing Chen, M.D.Loma Linda, CA 923541073542692
  15. Christopher Chen, MDStanford, CA 943051467865527
  16. May Chen, MDCampbell, CA 950081386603447
  17. Thomas Chen, MDSan Jose, CA 951241891870317
  18. Michael Cheng, MDSan Francisco, CA 941431306105309
  19. Amy Chien, M.D.San Francisco, CA 941431922242932
  20. Curtis Chong, MD, PHDPalo Alto, CA 943041912167420
  21. Jeena Chorath, M.D.Torrance, CA 905021639529480
  22. Muneeb Choudry, M.D.Escondido, CA 920291518924323
  23. Cathie Chung, M.D.Duarte, CA 910101679599914
  24. Melissa Cohen, M.D.Simi Valley, CA 930651174763262
  25. Alexander Colevas, MDPalo Alto, CA 943041588726558
  26. Carolyn Collins, MDRedding, CA 960021356380554
  27. Natalia Colocci, MDPalo Alto, CA 943011215948484
  28. Elizabeth Conner, MDIrvine, CA 926181861052888
  29. Steven Corsello, MDPalo Alto, CA 943041407015944
  30. Lee Cranmer, MD, PHDDuarte, CA 910101861465759
  31. Jennie CrewsPalo Alto, CA 943041609987874
  32. Anishka D'Souza, M.D.Los Angeles, CA 900891811256654
  33. Ricardo Da Roza, M.D.Castro Valley, CA 945461184669285
  34. Lloyd Damon, MDSan Francisco, CA 941431548224058
  35. Millie Das, MDPalo Alto, CA 943041225182322
  36. Farshid Dayyani, M.D., PH.D.Orange, CA 928681376710434
  37. Ivan De KouchkovskySan Francisco, CA 941431245692839
  38. Steven Deeks, MDSan Francisco, CA 941431073604666
  39. Christopher Di Simone, M.D.Rancho Mirage, CA 922701861461147
  40. Molly Diaz, PA-CDuarte, CA 910101558500397
  41. James Dickerson, MDStanford, CA 943051851897813
  42. Thanh Nga Doan, M.D.Duarte, CA 910101598297459
  43. Milana Dolezal, M.D.Palo Alto, CA 943041174777643
  44. Charles Dollbaum, M.D.San Francisco, CA 941151205863552
  45. Achala Doraiswamy, MDMurrieta, CA 925631912188152
  46. Tanya Dorff, M.D.Duarte, CA 910101508879115
  47. Shane Dormady, M.D., PHDLos Gatos, CA 950321417024654
  48. Noam Drazin, M.D.Beverly Hills, CA 902111952313520
  49. Jakob Dupont, MDSouth San Francisco, CA 940801558332585
  50. Kaitlyn Dykes, MDSan Diego, CA 921031861952632

Source: CMS NPPES, primary taxonomy 207RX0202X: records by practice city and the list of records, file of Aug 9, 2026.

California ranks 31 of 51 per resident

  1. Virginia1.2
  2. Kansas1.2
  3. Wisconsin1.2
  4. California1.1
  5. Indiana1.1
  6. Idaho1.1
  7. 50 states and D.C.1.7

Source: CMS NPPES, primary taxonomy 207RX0202X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.

82.1% of these records appear in a Medicare file, against 81.8% 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. California82.1%
  2. United States81.8%

Medical Oncology Physician records in California, measured

  • In a Medicare file367 of 447 · 82.1% here, 81.8% nationally
  • In the CMS Doctors and Clinicians file313 · 70.0% here, 72.5% nationally
  • Not updated in five years or more184 · 41.2% here, 49.3% nationally
  • Median graduation year2004 · the 312 records with a school on file

Source: CMS NPPES, file of Aug 9, 2026 (primary taxonomy 207RX0202X); CMS Medicare Part D Prescribers 2024, MIPS 2023, Open Payments 2024 and Doctors and Clinicians, matched by NPI.

What the count covers

447 NPPES records list medical oncology physician (207RX0202X) as their primary taxonomy with a practice address in California: 1.1 per 100,000 residents against 1.7 nationally (50 states and D.C.). Stanford has 82 of them (18%).

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. Massachusetts421
  2. Texas547
  3. New York548
  4. Florida561

States with a similar rate per 100,000

  1. Indiana1.1
  2. Wisconsin1.2
  3. Idaho1.1
  4. Kansas1.2

The largest states

  1. Florida561
  2. New York548
  3. Texas547
  4. Massachusetts421
  5. Pennsylvania265

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.