William Breen, MD
NPI 1437683562ActiveIndividual· Radiology, Radiation Oncology· Rochester, MN
Radiology, Radiation Oncology (MD) with Mayo Clinic, practicing in Rochester, Minnesota. Mostly services rather than prescriptions: Medicare paid $141,797 for 234 patients in 2024, with only 47 Part D claims. Lists Mayo Clinic Hospital Rochester as a hospital affiliation.
Overview
| NPI | 1437683562 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Apr 15, 2017 |
| Last updated in NPPES | Dec 10, 2025 |
| Certified by provider | Dec 10, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Radiology, Radiation Oncology Primary | 2085R0001X | 64064 | MN |
| Radiology, Radiation Oncology | 2085R0001X | 81689 | WI |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Radiation Oncology (MN); Practitioner - Radiation Oncology (WI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 234 |
|---|---|
| Services billed | 1,955 across 27 procedure codes |
| Paid by Medicare | $141,797 |
Part D prescriptions in 2024
| Prescriptions (claims) | 47 · 54 30-day fills |
|---|---|
| Patients | 30 |
| Total drug cost | $594.62 |
| Generic share | 96% of claims |
Education and affiliations
| Graduation year | 2017 |
|---|---|
| Medicare specialty | Radiation Oncology |
| Telehealth | Offers telehealth |
Medical group
- Mayo ClinicRochester, MN · 4,956 clinicians
Hospital affiliation
- Mayo Clinic Hospital RochesterRochester, MN
Industry payments (Open Payments)
None reported for 2025 or 2024.
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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