NPPES file of Aug 9, 2026

Surgical Oncology Physician in California

250 NPPES records list surgical oncology physician with a practice address in California, 0.6 per 100,000 residents, the 15th highest rate of 50. Los Angeles and Duarte have the most; each record links to the provider's NPI and the California license search. Page 4 of 5.

CMS NPPES registry, file of Aug 9, 2026; 2023 Census estimates · NUCC 2086X0206X · 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, 38

  1. Los Angeles38
  2. Duarte26
  3. San Diego16
  4. San Francisco16
  5. Sacramento15

Surgical Oncology Physician records in California

  1. Leslie Memsic, M.D.Beverly Hills, CA 902101821019456
  2. Lawrence Menendez, M.D.Los Angeles, CA 900331144233099
  3. Shaila Merchant, MSC, MHSC, MDDuarte, CA 910101053752253
  4. Katrina Mitchell, M.D.Santa Barbara, CA 931051225233760
  5. Alexandra Moore, M.D.Vallejo, CA 945891902268253
  6. Melinda Mortenson, M.D.Sacramento, CA 958251447231931
  7. Blaine Morton, MDFontana, CA 923351609924513
  8. Michelle Mulder, MDSan Francisco, CA 941431851787675
  9. Raja Narayan, MD MPHLoma Linda, CA 923541174910533
  10. Maria Nelson, M.D.Los Angeles, CA 900331265783872
  11. Andrew Nguyen, M.D.Torrance, CA 905031457650707
  12. Dean Nora, MDWoodland Hills, CA 913671003955709
  13. Jeffrey Norton, MDStanford, CA 943051255471371
  14. Theodore O'Connell, MDLos Angeles, CA 900271073684007
  15. Victoria O'Connor, M.D.Santa Monica, CA 904041962630467
  16. Michael O'Leary, MDLoma Linda, CA 923541811244312
  17. Stephanie OrzocoSan Jose, CA 951241558203489
  18. Jay Owens, M.D.Roseville, CA 956611124124722
  19. Junko Ozao-Choy, M.D.Torrance, CA 905021912165143
  20. Vennila Padmanaban, M.D.Santa Clara, CA 950511508220880
  21. Maranda Pahlkotter, MDStockton, CA 952041073909636
  22. Dilipkumar Parekh, MDLos Angeles, CA 900331043242795
  23. Ralitza ParinaDuarte, CA 910101427437227
  24. June Peng, MDWalnut Creek, CA 945981124321252
  25. Vicki Philben, M.D.Redding, CA 960021033180682
  26. Heather Player, MDLancaster, CA 935341023302973
  27. Christina Poloni, D.O.Duarte, CA 910101922560556
  28. Amy Polverini, MDSouth Pasadena, CA 910301073760815
  29. Raquel Prati, MDLos Angeles, CA 900951427256262
  30. Amir Ali Rahnemai Azar, M.D.Pasadena, CA 911021023339496
  31. Pedro Ramirez, M.D.Saint Helena, CA 945741538274816
  32. Judi Anne Ramiscal, MDColton, CA 923241326458845
  33. Hector Ramos, M.D.Los Angeles, CA 900331770515421
  34. Decio Rangel, MDSanta Monica, CA 904041659464485
  35. Mustafa Raoof, M.D.Duarte, CA 910101013155019
  36. Mark Reeves, M.D.Loma Linda, CA 923541467482554
  37. Louis Rivera, M.D.La Jolla, CA 920371407904592
  38. Sanziana Roman, MDSan Francisco, CA 941431285615567
  39. Hootan Roozrokh, MDLos Gatos, CA 950321366520991
  40. Elizabeth Rupp, MDPanorama City, CA 914021528116324
  41. Lakhbir Sandhu, MD PHD FRCSCSacramento, CA 958231134662125
  42. Praveen Satarasinghe, MD, MBASan Francisco, CA 941431053999292
  43. Aaron Saunders, M.D.Loma Linda, CA 923541811280241
  44. Nadine Schenker, PA-CSacramento, CA 958161881527034
  45. Michael Schlieman, MDSacramento, CA 958231366423485
  46. Philip Schneider, M.D.Sacramento, CA 958171265416655
  47. Hans Schoellhammer, MDLancaster, CA 935341861684938
  48. Aaron Scott, M.D.Lancaster, CA 935341295115814
  49. Natalie Seiser, MDGlendale, CA 912061255571949
  50. Stephen Sener, M.D.Los Angeles, CA 900331740357318

Source: CMS NPPES, primary taxonomy 2086X0206X: records by practice city and the list of records, file of Aug 9, 2026.

California ranks 15 of 50 per resident

  1. Wisconsin0.7
  2. Pennsylvania0.7
  3. Texas0.7
  4. California0.6
  5. Rhode Island0.6
  6. Florida0.6
  7. 50 states and D.C.0.6

Source: CMS NPPES, primary taxonomy 2086X0206X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.

83.6% of these records appear in a Medicare file, against 82.9% 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. California83.6%
  2. United States82.9%

Surgical Oncology Physician records in California, measured

  • In a Medicare file209 of 250 · 83.6% here, 82.9% nationally
  • In the CMS Doctors and Clinicians file184 · 73.6% here, 75.5% nationally
  • Not updated in five years or more111 · 44.4% here, 49.5% nationally
  • Median graduation year2004 · the 184 records with a school on file

Source: CMS NPPES, file of Aug 9, 2026 (primary taxonomy 2086X0206X); CMS Medicare Part D Prescribers 2024, MIPS 2023, Open Payments 2024 and Doctors and Clinicians, matched by NPI.

What the count covers

250 NPPES records list surgical oncology physician (2086X0206X) as their primary taxonomy with a practice address in California: 0.6 per 100,000 residents against 0.6 nationally (50 states and D.C.). Los Angeles has 38 of them (15%).

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. New York209
  2. Texas206
  3. Florida138
  4. Pennsylvania92

States with a similar rate per 100,000

  1. Louisiana0.6
  2. Wisconsin0.7
  3. Ohio0.7
  4. Illinois0.6

The largest states

  1. New York209
  2. Texas206
  3. Florida138
  4. Pennsylvania92
  5. Ohio84

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.