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 5 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. Wes Lee, M.D.Santa Rosa, CA 954031376633149
  2. Robert Lehrer, M.D.Santa Monica, CA 904031851664577
  3. David Leibowitz, MDPalo Alto, CA 943011508975665
  4. Ryan Leibrandt, M.D.Sacramento, CA 958171801327044
  5. Lawrence Leichman, M.D.Palm Springs, CA 922621891792305
  6. Richard Lenon, M.D.Woodside, CA 940621548575582
  7. Heinz-Josef Lenz, M.D.Los Angeles, CA 900331700814209
  8. Lucille Leong, MDDuarte, CA 910101104936459
  9. Joel Lester, M.D.Anaheim, CA 928011609873298
  10. Ronald Levy, MDStanford, CA 943051851427025
  11. Daneng Li, M.D.Duarte, CA 910101285877209
  12. Xin Li, M.D.Berkeley, CA 947041639442429
  13. Dean Lim, MDDuarte, CA 910101790892735
  14. Jieying Liu, MDSan Gabriel, CA 917761609404870
  15. Lawrence Liu, MDLos Angeles, CA 900481255890380
  16. Louisa Liu, MDDuarte, CA 910101154941201
  17. Stephen Liu, MDLos Angeles, CA 900891184788432
  18. Richard Lloyd, M.D.Fullerton, CA 928351073509030
  19. Elwyn Loh, M.D.South San Francisco, CA 940801124270186
  20. Donald Lombardi, MDStanford, CA 943051053339788
  21. Kimberly Loo, MDPalo Alto, CA 943041174150643
  22. Christine Lovly, MD, PHDDuarte, CA 910101265589071
  23. Ann Lowe, M.D.Palo Alto, CA 943061013278811
  24. Min Lu, MDStanford, CA 943051568488526
  25. Zarah Dulce Lucas, MDLoma Linda, CA 923571235369703
  26. Judith Luce, MDSan Francisco, CA 941101073628400
  27. Thehang Luu, MDDuarte, CA 910101366559155
  28. Lauren Maeda, M.D.Stanford, CA 943051316127657
  29. Olivia Main, MDSan Diego, CA 921031225664352
  30. Ruby Maini, MDPleasanton, CA 945881063906063
  31. Sareena Malhi, MDTravis Afb, CA 945351578597522
  32. Martha Man, MDSan Jose, CA 951241518976042
  33. Divneet Mandair, MSSan Francisco, CA 941581033614342
  34. Gabriel Mannis, MDStanford, CA 943051881929347
  35. Kim Margolin, MDSanta Monica, CA 904041912014713
  36. Robert Margolis, M.D.Torrance, CA 905021568401388
  37. Natalie Marshall, M.D.Berkeley, CA 947021366445470
  38. Anastasia Martynova, M.D.Los Angeles, CA 900891841731288
  39. Erminia Massarelli, MDDuarte, CA 910101982855326
  40. Suleiman Massarweh, MDStanford, CA 943051972619708
  41. Michael Masterson, M.D.Westlake Village, CA 913611649240052
  42. Kelly McCann, M.D., PH.D.San Diego, CA 921031942599915
  43. Edward McClay, M.D.San Marcos, CA 920691497727465
  44. Arnav Mehta, MDStanford, CA 943051649700899
  45. Michelle Melisko, MDSan Francisco, CA 941431306803812
  46. Suzy Melkonian, MDChatsworth, CA 913111730188152
  47. Lekha Mikkilineni, M.DStanford, CA 943051205270139
  48. David Minor, MDSan Francisco, CA 941151023042942
  49. Hamid Mirshahidi, M.D.Loma Linda, CA 923541659307015
  50. Alain Mita, MDNewport Beach, CA 926631285602565

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.