Sean Marquis, MD
NPI 1053554089 · Emergency Medicine Physician · Janesville, WI
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Sean Marquis, MD is a Emergency Medicine Physician provider in Janesville, WI (NPI 1053554089).
Provider details
- NPI number
- 1053554089
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 46924-20 (WI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
17 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 6 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Prednisone | 26 | 26 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 23 | 23 |
| Nitrofurantoin Monohyd/M-Crystbrand: Nitrofurantoin Mono-Macro | 22 | 21 |
| Ondansetronbrand: Ondansetron Odt | 15 | 15 |
| Azithromycin | 14 | 13 |
| Doxycycline Hyclate | 13 | 13 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they include 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 , 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
- 2009-04-07
- Last updated
- 2026-04-16
- Certified
- 2026-04-16
Frequently asked questions
- What is Sean Marquis's NPI number?
- Sean Marquis's National Provider Identifier (NPI) is 1053554089, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Sean Marquis's specialty?
- Sean Marquis is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Sean Marquis located?
- Sean Marquis's practice location on file with NPPES is 1000 Mineral Point Ave, Janesville, WI 53548-2940.
- What is Sean Marquis's phone number?
- The practice phone number listed in the NPPES registry for Sean Marquis is (608) 756-6611.
- Does Sean Marquis accept Medicare?
- Sean Marquis is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Sean Marquis's NPI active?
- Yes — Sean Marquis's NPI (1053554089) is active in the NPPES registry as of the last update on 2026-04-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.