NPPES file of Aug 9, 2026

Medical Oncology Physician in Iowa

61 NPPES records list medical oncology physician with a practice address in Iowa, 1.9 per 100,000 residents, the 14th 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 207RX0202X · 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, 19

  1. Iowa City19
  2. Des Moines16
  3. Cedar Rapids8
  4. Ankeny6
  5. Mason City5

Medical Oncology Physician records in Iowa

  1. Steven Snyder, MDMason City, IA 504011649385477
  2. Ann Stroh, DOCedar Rapids, IA 524031568585206
  3. Pawina Subedi, MDWaterloo, IA 507011184277642
  4. Praveen Vikas, MDFairfield, IA 525561619162435
  5. Ioannis Voutsadakis, MDIowa City, IA 522421578361739
  6. Mathew Wehbe, MDDes Moines, IA 503141619186368
  7. Mark Westberg, MDAnkeny, IA 500231952362394
  8. Martin Wiesenfeld, M.D., F.A.C.P.Cedar Rapids, IA 524031740265404
  9. Deborah Wilbur, M.D.Cedar Rapids, IA 524031063461689
  10. Shawn Yu, MD, PHDIowa City, IA 522421710447032
  11. Jun Zhang, M.D., PH.D.Iowa City, IA 522421902175615

Source: CMS NPPES, primary taxonomy 207RX0202X: records by practice city and the list of records, file of Aug 9, 2026.

Iowa ranks 14 of 51 per resident

  1. Washington2.3
  2. New Hampshire2.1
  3. Pennsylvania2.0
  4. Iowa1.9
  5. Colorado1.8
  6. Texas1.8
  7. 50 states and D.C.1.7

Source: CMS NPPES, primary taxonomy 207RX0202X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.

75.4% of these records appear in a Medicare file, against 81.8% 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. Iowa75.4%
  2. United States81.8%

Medical Oncology Physician records in Iowa, measured

  • In a Medicare file46 of 61 · 75.4% here, 81.8% nationally
  • In the CMS Doctors and Clinicians file45 · 73.8% here, 72.5% nationally
  • Not updated in five years or more22 · 36.1% here, 49.3% nationally
  • Median graduation year2002 · the 45 records with a school on file

Source: CMS NPPES, file of Aug 9, 2026 (primary taxonomy 207RX0202X); CMS Medicare Part D Prescribers 2024, MIPS 2023, Open Payments 2024 and Doctors and Clinicians, matched by NPI.

What the count covers

61 NPPES records list medical oncology physician (207RX0202X) as their primary taxonomy with a practice address in Iowa: 1.9 per 100,000 residents against 1.7 nationally (50 states and D.C.). Iowa City has 19 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. Arizona63
  2. Kentucky59
  3. Wisconsin69
  4. Utah46

States with a similar rate per 100,000

  1. Colorado1.8
  2. Texas1.8
  3. North Dakota1.8
  4. Michigan1.8

The largest states

  1. Florida561
  2. New York548
  3. Texas547
  4. California447
  5. Massachusetts421

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.