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 8 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. Roman Shulze, D.O.Anaheim, CA 928051679667182
  2. Jaspal Sidhu, MDAntioch, CA 945091649358722
  3. Delaney Smith, MDLos Angeles, CA 900151255489159
  4. Stephanie Sobczynski-Patton, D.O., M.P.HUkiah, CA 954821831385186
  5. Stephen Sparks, MDMoreno Valley, CA 925551326292640
  6. Benjamin Stork, DO, MPHEl Segundo, CA 902451295176626
  7. Jeffrey Sugar, D.O.San Diego, CA 921271639280597
  8. Victor Sulit, MD, MPHVictorville, CA 923951750501250
  9. Chao Sun, M.D.Pleasanton, CA 945881013118884
  10. Hyukje Sung, MD, MALoma Linda, CA 923541003502105
  11. Elizabeth Sutherland, M.D.Danville, CA 945261952347569
  12. Robert Taber, MD, MPHYucaipa, CA 923991265886964
  13. Meredith Tallman, MDFolsom, CA 956301275605016
  14. Charles Tang, M.D.Long Beach, CA 908131164632527
  15. Christopher Tang, MDLong Beach, CA 908131669669354
  16. Helen Tang, M.D.Long Beach, CA 908131407065139
  17. Irene Tang, M.D.Los Angeles, CA 900071164648929
  18. Michael Tenison, M.D.Roseville, CA 956611942257639
  19. Douglas Thierer, DOSouth San Francisco, CA 940801811075468
  20. Joseph Thoene, M.D.San Diego, CA 921011801907423
  21. Richard Thompson, M.D.Sunnyvale, CA 940861376641076
  22. Marlon Tingzon, DOSan Diego, CA 921341194135327
  23. Simone Tramma, M.D.West Sacramento, CA 956051417169079
  24. Lien Tran, DOSacramento, CA 958251912283318
  25. Craig Uejo, M.D.La Mesa, CA 919421932210440
  26. Paul Umof, M.D.Rancho Cucamonga, CA 917301063537199
  27. Robert Vinton, M.D.San Diego, CA 921011497866917
  28. Joseph Vo, M.D.San Diego, CA 921451467613984
  29. Jennifer Vogt, MDLoma Linda, CA 923541780651307
  30. Anton Volpicelli, D.O.El Segundo, CA 902451184719429
  31. Robert Vu, MDHuntington Beach, CA 926481205929296
  32. Robert Wachs, MDCupertino, CA 950141710064662
  33. Phillip Wagner, MDVallejo, CA 945891912931619
  34. Alina Walasek, M.D.Richmond, CA 948011790893378
  35. Bruce Walker, M.D.Santa Maria, CA 934551376517292
  36. Samuel Walters, MDSan Rafael, CA 949031790869782
  37. Christina Wang, MD, MPHSan Francisco, CA 941151447339189
  38. Thomas Wang, MDSan Diego, CA 921201649342122
  39. Xiaoguang Wang, M.D.Fontana, CA 923361528246881
  40. Elyssa Wasserberg, DCOakland, CA 946071275729360
  41. Howard Waters, M.D.Riverside, CA 925071639188899
  42. Richard Watts, M.D., M.P.H.Livermore, CA 945511932472065
  43. Leland Wessel, M.D.San Diego, CA 921221609988633
  44. Gerald West Jr., MDRiverside, CA 925051194873182
  45. Ronald Whitmore, MDModesto, CA 953561093894883
  46. Larry Widman, M.D.Salinas, CA 939071366765448
  47. Nancy Wiese, D.O.San Francisco, CA 941141962637918
  48. Kenneth Wilkes, MDNapa, CA 945581922186741
  49. Michael Wolf, MD, MSCovina, CA 917231982921706
  50. Erik Won, D.O., M.P.H.Newport Beach, CA 926601053579946

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.