NPPES file of Aug 9, 2026

Radiation Oncology Physician in Iowa

67 NPPES records list radiation oncology physician with a practice address in Iowa, 2.1 per 100,000 residents, the 25th highest rate of 51. Iowa City and Des Moines have the most; each record links to the provider's NPI and the Iowa license search. Page 2 of 2.

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).

Iowa City has the most, 21

  1. Iowa City21
  2. Des Moines14
  3. Cedar Rapids6
  4. Ames4
  5. Davenport3

Radiation Oncology Physician records in Iowa

  1. Daniel Rothfuss, M.D.Ottumwa, IA 525011952302606
  2. Samuel Schroeder, M.D.Des Moines, IA 503091861871105
  3. Christine Sharis, MDDavenport, IA 528041033106729
  4. Arshin Sheybani, M.D.Des Moines, IA 503091407082712
  5. Gary Shultz, D.O.Cedar Rapids, IA 524031538177241
  6. Mark Smith, MDIowa City, IA 522421487656971
  7. Randy Sorum, M.D.Sioux City, IA 511011720059181
  8. Wenqing Sun, M.B.Iowa City, IA 522421619187036
  9. Ferial Tewfik, MDIowa City, IA 522451053306761
  10. Hamed Tewfik, MDIowa City, IA 522421437144144
  11. John Triantafyllos, M.D.Des Moines, IA 503091720053705
  12. Logan Verheyen, MDIowa City, IA 522421396548269
  13. Antonio Vigliotti, MDDavenport, IA 528041235126905
  14. George Voynov, MDDes Moines, IA 503141972694362
  15. Addison Willett, MD, JD, MBAIowa City, IA 522421508252941
  16. Kailin Yang, MD, PHDIowa City, IA 522421932631710
  17. Gregory Yee, MDAmes, IA 500101962484113

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

Iowa ranks 25 of 51 per resident

  1. Montana2.1
  2. Arizona2.1
  3. West Virginia2.1
  4. Iowa2.1
  5. Alaska2.0
  6. Maryland2.0
  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.

73.1% 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. Iowa73.1%
  2. United States82.3%

Radiation Oncology Physician records in Iowa, measured

  • In a Medicare file49 of 67 · 73.1% here, 82.3% nationally
  • In the CMS Doctors and Clinicians file45 · 67.2% here, 74.0% nationally
  • Not updated in five years or more40 · 59.7% here, 54.6% nationally
  • Median graduation year2010 · the 45 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

67 NPPES records list radiation oncology physician (2085R0001X) as their primary taxonomy with a practice address in Iowa: 2.1 per 100,000 residents against 2.1 nationally (50 states and D.C.). Iowa City has 21 of them (31%).

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. Kansas68
  2. Louisiana66
  3. Utah62
  4. Oklahoma56

States with a similar rate per 100,000

  1. West Virginia2.1
  2. Arizona2.1
  3. Montana2.1
  4. North Carolina2.1

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.