NPPES file of Aug 9, 2026

Hematology & Oncology Physician in California

1,583 NPPES records list hematology & oncology physician with a practice address in California, 4.1 per 100,000 residents, the 19th highest rate of 51. Los Angeles and San Diego have the most; each record links to the provider's NPI and the California license search. Page 25 of 32.

CMS NPPES registry, file of Aug 9, 2026; 2023 Census estimates · NUCC 207RH0003X · 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, 153

  1. Los Angeles153
  2. San Diego88
  3. Sacramento77
  4. San Francisco64
  5. Orange63

Hematology & Oncology Physician records in California

  1. Jonathan Riess, M.D., M.S.Sacramento, CA 958171619132461
  2. Abhay Risbud, MDBakersfield, CA 933011598824245
  3. Gabriel Rivera, M.D.Fresno, CA 937201295961480
  4. Cecil Robertson, M. D.Santa Maria, CA 934541780640631
  5. Robert Robles, M.D.Pleasant Hill, CA 945231518963958
  6. John Rochat, M.D.Fort Bragg, CA 954371770508616
  7. Eve Rodler, M.D.Sacramento, CA 958171811069115
  8. Erin Roesch, M.D.La Jolla, CA 920931336464262
  9. William Rogoway, M.D.Stanford, CA 943051952443335
  10. Nitin Rohatgi, M.D.Sacramento, CA 958161235161621
  11. Sepehr Rokhsar, M.D.Los Angeles, CA 900481437182805
  12. Joshua Romain, M.D.Travis Afb, CA 945351528447448
  13. Darwin Roman, M.D.Newport Beach, CA 926601821478082
  14. Thomas Roschak, MDAuburn, CA 956031730252917
  15. Aaron Rosenberg, M.D., M.S.Sacramento, CA 958171144479411
  16. Joshua Rosenberg, MDVentura, CA 930031124280896
  17. Barry Rosenbloom, M.D.Beverly Hills, CA 902111518963016
  18. Alan Rosenblum, M.D.Santa Barbara, CA 931051396816864
  19. Fred Rosenfelt, M.D.Beverly Hills, CA 902121306842802
  20. Michael Rosenzweig, M.D.Duarte, CA 910101164470126
  21. Michael Rosove, MDLos Angeles, CA 900951528088549
  22. Stanley Rossman, MDVan Nuys, CA 914051578667127
  23. Eric RothSan Diego, CA 921031629655493
  24. Nancy Rubin, D.O.Monterey, CA 939401003980947
  25. Stanley Rubin, M.D.La Mirada, CA 906381861433450
  26. Candice Ruby, MDRiverside, CA 925051407904451
  27. Ravin Rupani, M.D.Montebello, CA 906401730379728
  28. Michael Russin, MDWalnut Creek, CA 945961063590156
  29. Joseph Ryan, MDSanta Barbara, CA 931051588161178
  30. Melissa Ryan, RNSan Francisco, CA 941431558230938
  31. Ghaleb Saab, MDRiverside, CA 925061396720850
  32. Siamak Saadat, M.D.Colton, CA 923241992018642
  33. Donna Saba, FNPPleasant Hill, CA 945231467655639
  34. Esha Sachdev, MDLong Beach, CA 908061114260460
  35. Irina Sachelarie, M.D.Newport Beach, CA 926601730139387
  36. Saeed Sadeghi, MDSanta Monica, CA 904041144240334
  37. Sohail Saeed, MDFontana, CA 923351053469007
  38. Omid Saeed Tehrani, M.D., PH.D,Fresno, CA 937011659508281
  39. Ann SalahuddinVentura, CA 930031053350231
  40. Ricardo SalasBakersfield, CA 933061497045355
  41. Alfred Saleh, M.D.San Diego, CA 921231780653857
  42. Edna Salinas, MD, PH.D.Oroville, CA 959661154362341
  43. Alexander Salter, MD, PHDPalo Alto, CA 943051023698388
  44. Shamel Sanani, MDMission Hills, CA 913451174522585
  45. Juan Sanchez, MDCerritos, CA 907031447298633
  46. Philip Sardar, MDFolsom, CA 956301912079724
  47. Sarmen Sarkissian, M.D.Mission Hills, CA 913451215201058
  48. Aditya Sarvaria, MDSan Diego, CA 921031407116627
  49. Nawid Sarwari, M.D.Anaheim, CA 928011649698630
  50. Joshua Sasine, M.D.Los Angeles, CA 900241396044566

Source: CMS NPPES, primary taxonomy 207RH0003X: records by practice city and the list of records, file of Aug 9, 2026.

California ranks 19 of 51 per resident

  1. Ohio4.4
  2. New Jersey4.3
  3. Louisiana4.1
  4. California4.1
  5. Nebraska4.0
  6. Virginia4.0
  7. 50 states and D.C.4.2

Source: CMS NPPES, primary taxonomy 207RH0003X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.

83.1% 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. California83.1%
  2. United States82.9%

Hematology & Oncology Physician records in California, measured

  • In a Medicare file1,315 of 1,583 · 83.1% here, 82.9% nationally
  • In the CMS Doctors and Clinicians file1,126 · 71.1% here, 71.3% nationally
  • Not updated in five years or more917 · 57.9% here, 54.3% nationally
  • Median graduation year2003 · the 1,124 records with a school on file

Source: CMS NPPES, file of Aug 9, 2026 (primary taxonomy 207RH0003X); CMS Medicare Part D Prescribers 2024, MIPS 2023, Open Payments 2024 and Doctors and Clinicians, matched by NPI.

What the count covers

1,583 NPPES records list hematology & oncology physician (207RH0003X) as their primary taxonomy with a practice address in California: 4.1 per 100,000 residents against 4.2 nationally (50 states and D.C.). Los Angeles has 153 of them (10%).

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 York1,163
  2. Texas922
  3. Florida818
  4. Pennsylvania784

States with a similar rate per 100,000

  1. Nebraska4.0
  2. Louisiana4.1
  3. Virginia4.0
  4. North Carolina4.0

The largest states

  1. New York1,163
  2. Texas922
  3. Florida818
  4. Pennsylvania784
  5. Illinois666

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.