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 6 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. Mark Moasser, M.D.San Francisco, CA 941151417911751
  2. Oranus Mohammadi, MDFresno, CA 937101881119501
  3. Varun Monga, MBBS, MDSan Francisco, CA 941431285897736
  4. Robert Morgan, MDGlendora, CA 917411285741223
  5. Joanne Mortimer, M.D.Duarte, CA 910101558319038
  6. Ramya Muddasani, D.O.Duarte, CA 910101457880163
  7. Pratik Multani, MDSan Diego, CA 921301053654467
  8. Pamela Munster, MDStanford, CA 943051619997145
  9. Nathaniel Myall, MDStanford, CA 943051285992230
  10. Rupali Nabar, MDHuntington Beach, CA 926481902062839
  11. Gayathri Nagaraj, MDLoma Linda, CA 923541346402286
  12. Leah Naghi, MDDuarte, CA 910101215433958
  13. Ronald Natale, M.D.West Hollywood, CA 900481285734350
  14. Kelsey Natsuhara, MDSan Francisco, CA 941431265936413
  15. Joel Neal, M.D., PH.D.Stanford, CA 943051790858942
  16. Alan Newman, MDSan Francisco, CA 941151346351822
  17. Charles Nguyen, M.D.Irvine, CA 926181902303431
  18. Kim-Son NguyenStanford, CA 943051831357029
  19. Lucio Nobile, MDFresno, CA 937201396828588
  20. Susan O'Brien, M.D.Orange, CA 928681669577276
  21. Coyin OhLos Angeles, CA 900481225666464
  22. Karla Olmedo Gutierrez, MDLong Beach, CA 908131407210891
  23. Delphine Ong, M.D.Sacramento, CA 958161023034022
  24. Mykola Onyshchenko, MD, PHDDuarte, CA 910101821342775
  25. Arsen Osipov, M.D.West Hollywood, CA 900481598108482
  26. Robert Ouwendijk, M.D.Ventura, CA 930031578627725
  27. Sumanta Pal, MDDuarte, CA 910101700938180
  28. Melanie Palomares, MDDuarte, CA 910101750347548
  29. Ming-Gui Pan, MDStanford, CA 943051568549418
  30. Divya Parikh, MDStanford, CA 943051760879662
  31. David Park, M.D.Fullerton, CA 928351275619447
  32. John Park, MDSan Francisco, CA 941151053375444
  33. Gerneiva Parkinson, MD MHSStanford, CA 943051447789912
  34. Ami Patel, M.D.Glendale, CA 912061518064278
  35. Giribala Patel, M.D.Fullerton, CA 928351033106562
  36. Hitendra Patel, M.D.La Jolla, CA 920931356327316
  37. Manali Patel, MD, MPHStanford, CA 943051801076138
  38. Neha Patel, MDStanford, CA 943051700240066
  39. Neil Patel, M.D.Sacramento, CA 958171992817613
  40. Shruti Patel, MDStanford, CA 943051083119267
  41. Ranjan Pathak, M.D.Chico, CA 959261770924102
  42. Parvin Peddi, MDTorrance, CA 905051750504577
  43. Mark Pegram, M.D.Stanford, CA 943051356361554
  44. Juliet Penn, M.D.Santa Barbara, CA 931051215175070
  45. Alexander Pham, M.D.San Jose, CA 951241487807111
  46. Anh PhamDuarte, CA 910101841599107
  47. Jacek Pinski, M.D.Los Angeles, CA 900891720014160
  48. Harlan Pinto, M.D.Stanford, CA 943051194813956
  49. Jana Portnow, MDDuarte, CA 910101679680458
  50. Klaus Porzig, MDStanford, CA 943051194784371

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.