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 31 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. Jeanna Welborn, M.D.Sacramento, CA 958171104808849
  2. Wen-Kai Weng, MD, PHDStanford, CA 943051659428241
  3. Kristopher Wentzel, M.D.Los Angeles, CA 900331427317403
  4. Ann Wexler, MDBerkeley, CA 947041669482576
  5. Christine White, M.D.Rancho Santa Fe, CA 920671265535728
  6. Maya White, M.D.Palo Alto, CA 943041992182638
  7. Nicole Whitlatch, MDChico, CA 959261114190972
  8. Melissa Whitney, MDVallejo, CA 945891568540391
  9. Melissa Williams, M.D.Sacramento, CA 958161205000122
  10. Khine Win, M.D.Auburn, CA 956021447525530
  11. Ronald Wisdom, M.D.Sacramento, CA 958171184607079
  12. Wesley Witteles, MDStanford, CA 943051720250186
  13. Peter Wittlinger, M.D.Fresno, CA 937201609860808
  14. Karrune WoanLos Angeles, CA 900891497173702
  15. Brian Wolf, MDSanta Monica, CA 904041730640772
  16. Thomas Woliver, MDSanta Barbara, CA 931051619995057
  17. Alexandra Wong, M.D.Duarte, CA 910101639673783
  18. Dan Wong, MDFremont, CA 945381083799308
  19. Deborah Wong, M.D., PH.D.Los Angeles, CA 900241902044951
  20. Derrick Wong, M.D.Mountain View, CA 940401194941104
  21. Francisco Wong, M.D.Del Mar, CA 920141033448949
  22. Glenn Wong, DOSanta Cruz, CA 950651063537934
  23. John Wong, MDOrange, CA 928681336436500
  24. Karlton Wong, MDBurbank, CA 915051376962381
  25. Rex Wong, MDBaldwin Park, CA 917061992877229
  26. Steven Wong, MDSanta Monica, CA 904031275553307
  27. David Wu, M.D.Beverly Hills, CA 902111588848659
  28. Hanhsing Wu, MDMountain View, CA 940401114034832
  29. Jocelyn Wu, MDSacramento, CA 958141679623383
  30. Lihong Wu, M.D.Long Beach, CA 908131932128410
  31. Michael Wu, MDSanta Cruz, CA 950651700850104
  32. Phillis Wu, M.D.Sylmar, CA 913421174716328
  33. Theodore Wun, M.D.Sacramento, CA 958171932181609
  34. Anita Xavier, MDFresno, CA 937031790884815
  35. Dong Xiang, MDSan Gabriel, CA 917761235332925
  36. Kun Xiao, MD MPHCastro Valley, CA 945461710326889
  37. David Xu, MDIrvine, CA 926041568826519
  38. George YaghmourLos Angeles, CA 900891669604849
  39. Hiroshi Yamagata, MDCerritos, CA 907031871948950
  40. Jessica Yan, M.D.Torrance, CA 905021881956191
  41. Ronald Yanagihara, M.D.Gilroy, CA 950201366478240
  42. Allen Yang, M.D.Los Angeles, CA 900891831126531
  43. Charlie Yang, MDFontana, CA 923351073680823
  44. Henry Yang, MDCovina, CA 917231255391512
  45. Kelly Khai Li Yap, M.D.South Pasadena, CA 910301346560786
  46. David Yashar, MDLong Beach, CA 908061396205316
  47. Todd Yates, D.O.Oxnard, CA 930301710197447
  48. Leonid Yavorkovsky, MDSan Jose, CA 951191689750119
  49. Omid Yazdanpanah, MDOrange, CA 928681235792581
  50. Jeffrey Ye, MDSanta Rosa, CA 954031669510665

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.