Sean Shannahan, MD
NPI 1831179571 · Diagnostic Radiology Physician · Madison, WI
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Sean Shannahan, MD is a Diagnostic Radiology Physician provider in Madison, WI (NPI 1831179571).
Provider details
- NPI number
- 1831179571
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 44311 (WI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 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
4,535 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) |
|---|---|---|
| X-Ray of Chest, 1 View71045 | 496 | $8 |
| X-Ray of Chest, 2 Views71046 | 318 | $10 |
| Screening Mammography77067 | 256 | $34 |
| Screening 3d Breast Mammography77063 | 255 | $26 |
| Ct Scan Head Or Brain Without Contrast70450 | 200 | $37 |
| Ct Scan of Abdomen and Pelvis With Contrast74177 | 168 | $80 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-01-19
- Last updated
- 2014-09-24
Frequently asked questions
- What is Sean Shannahan's NPI number?
- Sean Shannahan's National Provider Identifier (NPI) is 1831179571, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Sean Shannahan's specialty?
- Sean Shannahan is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is Sean Shannahan located?
- Sean Shannahan's practice location on file with NPPES is 700 S Park St, Madison, WI 53715-1849.
- What is Sean Shannahan's phone number?
- The practice phone number listed in the NPPES registry for Sean Shannahan is (608) 251-6100.
- Does Sean Shannahan accept Medicare?
- Sean Shannahan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Sean Shannahan's NPI active?
- Yes — Sean Shannahan's NPI (1831179571) is active in the NPPES registry as of the last update on 2014-09-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.