NPPES file of Aug 9, 2026

Radiation Oncology Physician in Illinois

277 NPPES records list radiation oncology physician with a practice address in Illinois, 2.2 per 100,000 residents, the 18th highest rate of 51. Chicago and Maywood have the most; each record links to the provider's NPI and the Illinois license search. Page 6 of 6.

CMS NPPES registry, file of Aug 9, 2026; 2023 Census estimates · NUCC 2085R0001X · method

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

Chicago has the most, 89

  1. Chicago89
  2. Maywood16
  3. Springfield13
  4. Rockford9
  5. Oak Lawn8

Radiation Oncology Physician records in Illinois

  1. Jagdish Thakrar, M.D.Chicago, IL 606121891844163
  2. Andre Thomas, MDChicago, IL 606371518603869
  3. Preston Thomas, MDChicago, IL 606111437918091
  4. Tarita Thomas, MD, PHDChicago, IL 606111659572014
  5. Arpi Thukral, MDWarrenville, IL 605551619032885
  6. Douglas Tippin, M.D., PHDWarrenville, IL 605551013900281
  7. Gregorio Tolentino, MDBlue Island, IL 604061336120807
  8. Robert Tomchuck, D.O.Orland Park, IL 604671669552584
  9. Faisal Vali, M.D.Palos Heights, IL 604631205097102
  10. Harsha Varadhi, MDOak Lawn, IL 604531699931527
  11. Dian Wang, MDChicago, IL 606121841246030
  12. Ralph Weichselbaum, M.D.Chicago, IL 606371578510749
  13. James Welsh, MS MDMaywood, IL 601531790748317
  14. Camille Williams, M.D.O Fallon, IL 622691649436510
  15. Ian Winter, MDPark Ridge, IL 600681013413285
  16. Jacob Witt, M.D.O Fallon, IL 622691891157871
  17. Shermian Woodhouse, MDNormal, IL 617611427000207
  18. James Wynstra, M.D.Springfield, IL 627811467541946
  19. Sulochana Yalavarthi, M.D.Harvey, IL 604261255331658
  20. Harold Yoon, MDDecatur, IL 625261558566984
  21. Young Yu, M.D.Quincy, IL 623011679570865
  22. Anthony Zalduendo, M.D.Peoria, IL 616371205844602
  23. Ross ZeitlinChicago, IL 606121689051328
  24. Shunqing Zhang, MDMcHenry, IL 600501649773425
  25. Ying Zhang, MDAurora, IL 605041518196377
  26. Rena Zimmerman, M.D.McHenry, IL 600501851350318
  27. Ryan Zitter, MD, MSCChicago, IL 606371962105031

Source: CMS NPPES, primary taxonomy 2085R0001X: records by practice city and the list of records, file of Aug 9, 2026.

Illinois ranks 18 of 51 per resident

  1. Florida2.3
  2. New York2.3
  3. Connecticut2.3
  4. Illinois2.2
  5. Missouri2.2
  6. Vermont2.2
  7. 50 states and D.C.2.1

Source: CMS NPPES, primary taxonomy 2085R0001X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.

78.0% of these records appear in a Medicare file, against 82.3% 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. Illinois78.0%
  2. United States82.3%

Radiation Oncology Physician records in Illinois, measured

  • In a Medicare file216 of 277 · 78.0% here, 82.3% nationally
  • In the CMS Doctors and Clinicians file184 · 66.4% here, 74.0% nationally
  • Not updated in five years or more136 · 49.1% here, 54.6% nationally
  • Median graduation year2004 · the 184 records with a school on file

Source: CMS NPPES, file of Aug 9, 2026 (primary taxonomy 2085R0001X); CMS Medicare Part D Prescribers 2024, MIPS 2023, Open Payments 2024 and Doctors and Clinicians, matched by NPI.

What the count covers

277 NPPES records list radiation oncology physician (2085R0001X) as their primary taxonomy with a practice address in Illinois: 2.2 per 100,000 residents against 2.1 nationally (50 states and D.C.). Chicago has 89 of them (32%).

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. Ohio298
  2. Massachusetts241
  3. Michigan239
  4. North Carolina230

States with a similar rate per 100,000

  1. Missouri2.2
  2. Vermont2.2
  3. Connecticut2.3
  4. New York2.3

The largest states

  1. California735
  2. Florida520
  3. New York449
  4. Texas449
  5. Pennsylvania383

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.