How many oncologists are there in Wisconsin?

99 active oncologists are listed in Wisconsin per the 2026-05-06 CMS NPPES snapshot. That works out to 1.66 per 100,000 residents using U.S. Census 2024 population estimates.

Where does Wisconsin rank nationally for oncologist supply?

Wisconsin ranks 29 of 51 U.S. states + DC by per-capita oncologist density. It sits at or below the 3-per-100k underserved threshold used by the parent Fonteum study.

U.S. Centers for Medicare & Medicaid Services NPI Registry (NPPES) — public API Combined with U.S. Census Bureau Population Estimates Program, 2024 Vintage (V2024) Snapshot date: 2026-05-06. The full per-state dataset is published at fonteum.com/research/oncology-supply-by-state-2026.

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1,322,867 nurse-staffing records · CMS PBJ

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oncologists per 100,000 in Wisconsin

Name: Wisconsin — oncologist supply per 100,000
Creator: Fonteum Research
Published: 2026-05-06
License: https://fonteum.com/editorial-policy

1.66 active oncologists per 100,000 residents — ranked 29 of 51 U.S. states + DC.

oncologists per 100,000 residents

1.66

99 active oncologists · 5,960,975 residents · Wisconsin

National rank: 29 / 51
Percentile: 45th
Underserved threshold: 3 / 100k
Quartile: Q3

Comparable areas

Three states whose oncologist per-100k density is closest to Wisconsin's — useful for benchmarking.

Virginiarank 281.68 / 100k
Illinoisrank 271.70 / 100k

Idahorank 30

1.60 / 100k

Citeable result

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Wisconsin has 99 active oncologists (1.66 per 100,000 residents) — ranked 29 of 51 U.S. states + DC. Source: CMS NPPES NPI Registry + U.S. Census Bureau, snapshot 2026-05-06. Threshold for "underserved" in the parent study: 3 per 100,000. Citation: Fonteum Research, /research/oncology-supply-by-state-2026.

Source provenance

U.S. Centers for Medicare & Medicaid Services NPI Registry (NPPES) — public API
U.S. Census Bureau Population Estimates Program, 2024 Vintage (V2024)
Snapshot date: 2026-05-06

Open the parent oncologist-supply study →

Limitations

This figure measures density (per-capita supply), not access. Drive time, appointment availability, insurance acceptance, and wait times are not modeled here.
The CMS NPPES registry counts NPI-1 individual providers with the relevant taxonomy code. It does not capture PA-led or NP-led practices that operate under a different taxonomy.
NPPES does not publish a county-level field of practice in its public API. County- and ZIP-scoped queries surface state-level density, with the geographic context preserved on this page.
Population is the U.S. Census Bureau 2024 vintage estimate. Population shifts post-2024 are not yet reflected.
The "underserved" threshold is the parent study's transparent baseline cutoff; it is not a regulatory or clinical definition. See the parent study for the rationale.

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