1. Home
  2. Directory
  3. Wisconsin
  4. Janesville
  5. Emergency Medicine
  6. NPI Profile

SEAN WILLIAM MARQUIS MD
NPI 1053554089
Emergency Medicine in Janesville, WI

Active since April 07, 2009PECOS EnrolledAccepts Medicare Assignment
1000 MINERAL POINT AVE, JANESVILLE, WI 53548(608) 756-6611(608) 756-6177 Get Directions Write a Review

NPPES record last updated: April 16, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

About Sean William Marquis Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

SEAN WILLIAM MARQUIS MD (NPI 1053554089) is an individual emergency medicine provider in Janesville, Wisconsin, licensed in Wisconsin (46924-20) and active in the NPI registry since April 2009. He is enrolled in Medicare PECOS, is affiliated with Mercy Health System Corp, and is a graduate of Other (2009).

NPPES Registry Identity

NPI1053554089
Entity TypeIndividualMale
Primary Taxonomy207P00000X
Provider Legal NameSEAN WILLIAM MARQUISCredential: MD
Location Address1000 MINERAL POINT AVEJanesville, WI 53548-2940
Mailing Address29624 Network PlChicago, IL 60673-1296 · (608) 756-6611 · Fax (608) 756-6177
Phone(608) 756-6611
Fax(608) 756-6177
Sole ProprietorNo
Medical School CMSOtherGraduated 2009
Enumeration DateApril 7, 2009
Last NPPES UpdateApril 16, 2026
NPPES CertifiedApril 16, 2026
✔ NPI 1053554089 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyEmergency MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207P00000X
Licenses✔ Licensed in WI · 46924-20✔ Licensed in MI · 4301099517✔ Licensed in IL · 036132727✔ Licensed in OH · 35097788
Definition
An emergency physician focuses on the immediate decision making and action necessary to prevent death or any further disability both in the pre-hospital setting by directing emergency medical technicians and in the emergency department. The emergency physician provides immediate recognition, evaluation, care, stabilization and disposition of a generally diversified population of adult and pediatric patients in response to acute illness and injury.
1000 MINERAL POINT AVE, Janesville, WI 53548
Open in Google Maps ↗

Other Identifiers 1

Medicaid1053554089WI

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Sean William Marquis Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID5496921249
PECOS Enrollment IDI20120622000151, I20200708000417
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Hospital Affiliations CMS Care Compare 2

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Mercy Health System Corp

Acute Care Hospitals · Janesville, WI
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number520066
Location1000 Mineral Point AveJanesville, WI 53548 · Rock County
Emergency services Birthing friendly

Mercy Walworth Hospital & Medical Center

Critical Access Hospitals · Lake Geneva, WI
5/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number521357
LocationN2950 State Road 67Lake Geneva, WI 53147 · Walworth County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 53548 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$82.92 typical visit price
range $53.90 – $163.24
Typical copayment $20.73 (range $13.47 – $40.81)
Most-billed visit code 99203
Established Patient
$95.41 typical visit price
range $17.40 – $133.76
Typical copayment $23.85 (range $4.35 – $33.44)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

BENJAMIN C. MILLER PMHNP
Nurse Practitioner (Psychiatric/Mental Health)
1000 MINERAL POINT AVE
JANESVILLE, WI 53548
Rock County (608) 756-6508
KARINA LAURA PAULIUS QUINN MD
Plastic Surgery
1000 MINERAL POINT AVE
JANESVILLE, WI 53548
Rock County (608) 756-6000
ALESIA L DRAKE DPT, PT
Physical Therapist
1000 MINERAL POINT AVE
JANESVILLE, WI 53548
Rock County (608) 756-6842
PAULINE R CASS PHARMD
Pharmacist
1000 MINERAL POINT AVE
JANESVILLE, WI 53548
Rock County (608) 756-6000
KAREN SAUNDERS OT
Occupational Therapist
1000 MINERAL POINT AVE
JANESVILLE, WI 53548
Rock County (608) 756-6000
DR. MERLE S RUST MD
Neurological Surgery
1000 MINERAL POINT AVE, MERCY WEST NEUROSURGERY
JANESVILLE, WI 53548
Rock County (608) 756-6826
DR. MICHAEL V COOGAN MD
Emergency Medicine (Medical Toxicology)
1000 MINERAL POINT AVE
JANESVILLE, WI 53548
Rock County (608) 756-6000
CHRISTOPHER B GOODAVISH PA
Physician Assistant
1000 MINERAL POINT AVE
JANESVILLE, WI 53548
Rock County (608) 756-6868

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Sean Marquis's NPI number?

The NPI number for Sean Marquis is 1053554089. It was assigned to this individual provider in the NPPES registry on April 7, 2009.

Where is Sean Marquis located?

Sean Marquis practices at 1000 Mineral Point Ave, Janesville, WI 53548. The listed phone number is (608) 756-6611.

What is Sean Marquis's specialty?

The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.

Is Sean Marquis enrolled in Medicare?

Yes. Sean Marquis is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Is Sean Marquis affiliated with any hospitals?

According to CMS data, Sean Marquis is affiliated with Mercy Health System Corp and Mercy Walworth Hospital & Medical Center.

When was this NPI record last updated?

The NPPES record for Sean Marquis was last updated on April 16, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.