NPPES file of Aug 9, 2026

Occupational Medicine Physician in California

415 NPPES records list occupational medicine physician with a practice address in California, 1.1 per 100,000 residents, the 14th highest rate of 50. San Diego and San Francisco have the most; each record links to the provider's NPI and the California license search. Page 9 of 9.

CMS NPPES registry, file of Aug 9, 2026; 2023 Census estimates · NUCC 2083X0100X · method

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

San Diego has the most, 37

  1. San Diego37
  2. San Francisco24
  3. Los Angeles23
  4. Sacramento16
  5. Oakland11

Occupational Medicine Physician records in California

  1. Timothy Won, MDLoma Linda, CA 923541174375299
  2. Han-Chi Wong, MDLos Angeles, CA 900121386973832
  3. Roy Wong, MDCupertino, CA 950141043399793
  4. Michelle Wueste, M.D.Edwards Afb, CA 935241902893084
  5. Jin Xiao, MDHarbor City, CA 907101801944699
  6. Xing Yang, M.D.,PH.D.,M.S.P.H.Harbor City, CA 907101518122308
  7. Robert Yee, M.D.Santa Rosa, CA 954011730302951
  8. Peter Yip, MDSacramento, CA 958251538247283
  9. Vicky Young, M.D., M.P.H.Vista, CA 920811780763235
  10. Richard Yu, MDFontana, CA 923351376610212
  11. Konstantin Zaharoff, MDSanta Rosa, CA 954031932271780
  12. Hong Zhang, M.D. M.P.H. MSOakland, CA 946091003931783
  13. Michael Zhang, MDRichmond, CA 948011053632521
  14. Guy ZimbardiSanta Maria, CA 934581972519064
  15. Marilyn ZwassLos Angeles, CA 900361831566934

Source: CMS NPPES, primary taxonomy 2083X0100X: records by practice city and the list of records, file of Aug 9, 2026.

California ranks 14 of 50 per resident

  1. Maryland1.1
  2. Connecticut1.1
  3. New Hampshire1.1
  4. California1.1
  5. New Mexico1.0
  6. Alaska1.0
  7. 50 states and D.C.0.8

Source: CMS NPPES, primary taxonomy 2083X0100X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.

29.6% of these records appear in a Medicare file, against 26.1% 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. California29.6%
  2. United States26.1%

Occupational Medicine Physician records in California, measured

  • In a Medicare file123 of 415 · 29.6% here, 26.1% nationally
  • In the CMS Doctors and Clinicians file51 · 12.3% here, 10.7% nationally
  • Not updated in five years or more311 · 74.9% here, 70.9% nationally
  • Median graduation year1995 · the 51 records with a school on file

Source: CMS NPPES, file of Aug 9, 2026 (primary taxonomy 2083X0100X); CMS Medicare Part D Prescribers 2024, MIPS 2023, Open Payments 2024 and Doctors and Clinicians, matched by NPI.

What the count covers

415 NPPES records list occupational medicine physician (2083X0100X) as their primary taxonomy with a practice address in California: 1.1 per 100,000 residents against 0.8 nationally (50 states and D.C.). San Diego has 37 of them (9%).

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. Texas168
  2. Ohio109
  3. Pennsylvania103
  4. Washington102

States with a similar rate per 100,000

  1. New Hampshire1.1
  2. New Mexico1.0
  3. Connecticut1.1
  4. Maryland1.1

The largest states

  1. Texas168
  2. Ohio109
  3. Pennsylvania103
  4. Washington102
  5. Colorado93

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.