NPPES file of Aug 9, 2026

Therapeutic Radiology Physician in California

28 NPPES records list therapeutic radiology physician with a practice address in California, 0.1 per 100,000 residents, the 19th highest rate of 41. Los Angeles and Orange have the most; each record links to the provider's NPI and the California license search.

CMS NPPES registry, file of Aug 9, 2026; 2023 Census estimates · NUCC 2085R0203X · 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, 2

  1. Los Angeles2
  2. Orange2
  3. Palo Alto2
  4. San Clemente2
  5. San Francisco2

Therapeutic Radiology Physician records in California

  1. Steve Benak, M.D.Riverbank, CA 953671861587727
  2. Bryan Chang, MDTorrance, CA 905051619151826
  3. Pauling Chang, MDSunnyvale, CA 940861194884692
  4. John Clark, M.D.Redding, CA 960011174664890
  5. Harvey Frey, M.D.Santa Monica, CA 904021609842392
  6. Don Goffinet, M.D.Palo Alto, CA 943041780724427
  7. Ralph Hanahan, M.D.Santa Rosa, CA 954031801986641
  8. Joseph Hodgkins, (RT)(R)(MR)(ARRT)Long Beach, CA 908221831692243
  9. Robert Johnson, M.D.San Luis Obispo, CA 934051598942781
  10. Owen Kim, M.D.Porterville, CA 932571861574352
  11. Richard Krieg, MDSan Francisco, CA 941151124062351
  12. Bryan Leigh, M.D.San Clemente, CA 926731407272669
  13. Narayana Memula, M.D.San Bernardino, CA 924111568478238
  14. Florian Ploch, MDVacaville, CA 956871356322705
  15. Nilam S Ramsinghani, MDOrange, CA 928681043390289
  16. Gordon Ray, MDPalo Alto, CA 943011265591770
  17. Mack Roach, M.D.San Francisco, CA 941431770523359
  18. Joan Ryoo, MD, MSHSLos Angeles, CA 900271699854596
  19. Reinhard Schulte, M.D.La Jolla, CA 920371528460334
  20. Michael Senikowich, M.D.Los Angeles, CA 900891720277130
  21. Neena P Shah, MDOrange, CA 928681700954021
  22. Dwight Stickney, M.D.Granite Bay, CA 957461225296676
  23. Jay Tassin, M.D.San Clemente, CA 926731659787596
  24. Ronald Van Roy, M.D.Santa Rosa, CA 954051720168586
  25. Thavinsakdi Viravathana, M.D.Hemet, CA 925431720022965
  26. Patrick Welton, MDCarmel, CA 939211427644798
  27. Henry Wong, M.D.Stockton, CA 952041376655431
  28. Dave Yamauchi, MDDuarte, CA 910101548217508

Source: CMS NPPES, primary taxonomy 2085R0203X: records by practice city and the list of records, file of Aug 9, 2026.

California ranks 19 of 41 per resident

  1. Ohio0.1
  2. Illinois0.1
  3. Texas0.1
  4. California0.1
  5. Maine0.1
  6. Oregon0.1
  7. 50 states and D.C.0.1

Source: CMS NPPES, primary taxonomy 2085R0203X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.

32.1% of these records appear in a Medicare file, against 57.1% 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. California32.1%
  2. United States57.1%

Therapeutic Radiology Physician records in California, measured

  • In a Medicare file9 of 28 · 32.1% here, 57.1% nationally
  • In the CMS Doctors and Clinicians file8 · 28.6% here, 48.0% nationally
  • Not updated in five years or more22 · 78.6% here, 72.0% nationally

Source: CMS NPPES, file of Aug 9, 2026 (primary taxonomy 2085R0203X); CMS Medicare Part D Prescribers 2024, MIPS 2023, Open Payments 2024 and Doctors and Clinicians, matched by NPI.

What the count covers

28 NPPES records list therapeutic radiology physician (2085R0203X) as their primary taxonomy with a practice address in California: 0.1 per 100,000 residents against 0.1 nationally (50 states and D.C.). Los Angeles has 2 of them (7%).

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. Florida27
  2. New York32
  3. Texas23
  4. Pennsylvania15

States with a similar rate per 100,000

  1. Illinois0.1
  2. Ohio0.1
  3. New Jersey0.1
  4. Maryland0.2

The largest states

  1. New York32
  2. Florida27
  3. Texas23
  4. Pennsylvania15
  5. Illinois10

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.