Sean William Marquis, MD
NPI 1053554089ActiveIndividual· Emergency Medicine· Janesville, WI
Emergency Medicine (MD) with Mercy Health System Corporation, practicing in Janesville, Wisconsin. Their prescriptions cost Medicare Part D more than their services did: $4,284 for 265 claims, against $2,562 paid for services in 2024. Lists Mercy Health System Corp and 1 other hospital as hospital affiliations.
Overview
| NPI | 1053554089 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Apr 7, 2009 |
| Last updated in NPPES | Apr 16, 2026 |
| Certified by provider | Apr 16, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Emergency Medicine Primary | 207P00000X | 46924-20 | WI |
| Emergency Medicine | 207P00000X | 4301099517 | MI |
| Emergency Medicine | 207P00000X | 036132727 | IL |
| Emergency Medicine | 207P00000X | 35097788 | OH |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Emergency Medicine (IL); Practitioner - Emergency Medicine (WI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 32 |
|---|---|
| Services billed | 34 across 7 procedure codes |
| Paid by Medicare | $2,562 |
Part D prescriptions in 2024
| Prescriptions (claims) | 265 · 268 30-day fills |
|---|---|
| Patients | 176 |
| Total drug cost | $4,284 |
| Generic share | 93% of claims |
Education and affiliations
| Graduation year | 2009 |
|---|---|
| Medicare specialty | Emergency Medicine |
Medical group
- Mercy Health System CorporationJanesville, WI · 753 clinicians
Hospital affiliations
- Mercy Health System CorpJanesville, WI
- Mercy Walworth Hospital & Medical CenterLake Geneva, WI
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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All 40 emergency medicine physicians in Janesville · All emergency medicine physicians in Wisconsin