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 32 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. Xuemei Ye, M.D.San Diego, CA 921201376937201
  2. Stephen Yee, MDOakland, CA 946021528078185
  3. Howard Yeh, MDBeverly Hills, CA 902111366698912
  4. Sam Yeh, MDRiverside, CA 925051689741498
  5. Michael Yen, M.D., PH.D.Santa Cruz, CA 950651437269313
  6. Christina Yeon, M.D.South Pasadena, CA 910301235186354
  7. Kay Yeung, MDSan Diego, CA 921031215285770
  8. Yuan Ying, M.D,Chico, CA 959261447612080
  9. Chih-Hong Young, M.D.Corona, CA 928821417919572
  10. David Young, M.D.Rancho Mirage, CA 922701427069350
  11. Shi Yu, M.D.Laguna Hills, CA 926531750744967
  12. Steven Yu, MDFountain Valley, CA 927081659643682
  13. Ashley YuanSacramento, CA 958171568016897
  14. Hyun Don Yun, MDIrvine, CA 926041508090473
  15. Naila ZahidRancho Mirage, CA 922701568303840
  16. Jason Zell, DOOrange, CA 928681568666014
  17. Manuel Zevallos, MDLynwood, CA 902621174611750
  18. Cathy Zhang, MDFresno, CA 937011316407984
  19. Hao Zhang, M.D.Los Angeles, CA 900331558462424
  20. Lulu Zhang, M.D.Monterey, CA 939401396003562
  21. Shannon Zhang, MDOrange, CA 928681871120162
  22. Xiaosong Zhang, MD, PHDSan Francisco, CA 941431124347877
  23. Gary Zhao, MDSan Jose, CA 951281124114285
  24. Hong Zhao, M.D.Salinas, CA 939011568696896
  25. Jenny Zhou, M.D.Los Angeles, CA 900891679992770
  26. Jenny Zhou, M.D.San Diego, CA 921031598007924
  27. Eric Zhuang, MDNewport Beach, CA 926601972008605
  28. Mohammadbagher Ziari, MDCorona, CA 928791962601047
  29. Bruce Zietz, M.D.West Hills, CA 913071184689002
  30. Collin Zimmerman, MDSan Diego, CA 921201396975256
  31. Sharvina Ziyeh, MDTorrance, CA 905031790272367
  32. Kai Zu, M.D.La Mesa, CA 919421164583639
  33. Jeffrey Zweig, MDPleasant Hill, CA 945231053600312

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.