William Breen, MD
NPI 1437683562 · Radiation Oncology Physician · Rochester, MN
Enrolled with Medicare as Practitioner - Radiation Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Breen, MD is a Radiation Oncology Physician provider in Rochester, MN (NPI 1437683562).
Provider details
- NPI number
- 1437683562
- Entity type
- Individual
- Primary specialty
- Radiation Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 64064 (MN)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
9 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
1,860 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Stereoscopic X-Ray Guidance for Localization of Target Volume for the Delivery of Radiation TherapyG6002 | 653 | $21 |
| Calculation of Radiation Therapy Dose77300 | 408 | $33 |
| Design and Construction of Complex Radiation Treatment Device77334 | 234 | $61 |
| Complex Radiation Therapy Planning77263 | 113 | $167 |
| Radiation Treatment Management, 5 Treatment Sessions77427 | 106 | $191 |
| High Precision Radiation Therapy Planning77301 | 72 | $423 |
| Design and Construction of Radiation Treatment Device for High Precision Radiation Therapy |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 1 distinct drug on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Dexamethasone | 17 | 16 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Registry dates
- Enumerated
- 2017-04-15
- Last updated
- 2025-12-10
- Certified
- 2025-12-10
Frequently asked questions
- What is William Breen's NPI number?
- William Breen's National Provider Identifier (NPI) is 1437683562, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Breen's specialty?
- William Breen is listed in the NPPES registry with a primary specialty of Radiation Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is William Breen located?
- William Breen's practice location on file with NPPES is 200 1st St Sw, Rochester, MN 55905.
- What is William Breen's phone number?
- The practice phone number listed in the NPPES registry for William Breen is (507) 284-2511.
- Does William Breen accept Medicare?
- William Breen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Breen's NPI active?
- Yes — William Breen's NPI (1437683562) is active in the NPPES registry as of the last update on 2025-12-10.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.