Sean P. Dyer, MD

Medicare activity in 2024

Official CMS public-use data for Sean P. Dyer, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.

Most frequent services

1. Emergency department visit with high level of medical decision making (99285)28 services
2. Emergency department visit with moderate level of medical decision making (99284)26 services

Chronic conditions among these patients

Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).

• High blood pressure75%
• High cholesterol55%
• Arthritis47%
• Diabetes44%
• Chronic kidney disease42%
• Depression39%

Hospitals where Sean P. Dyer works

Medicare's Facility Affiliation Data lists Sean P. Dyer at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.

• John H Stroger Jr HospitalChicago, IL · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 140124
• Mercy Health System CorpJanesville, WI · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 520066

Practice locations

Addresses where Sean P. Dyer is enrolled with Medicare (CMS data updated October 2, 2026).

• 1000 Mineral Point AveJanesville, WI 53548 (608) 756‑6000
• 3400 Deerfield DrJanesville, WI 53546 (608) 756‑5555

Group practices

Medicare enrollment lists Sean P. Dyer as a member of this group (CMS data updated October 2, 2026).

• Mercy Health System Corporation753 clinicians in the group

Specialties

• Emergency Medicineprimary

Find other Emergency Medicine doctors in Wisconsin →

Other emergency medicine doctors in Janesville

Clinicians with the same Medicare primary specialty in Janesville, WI — not a recommendation.

• Nelly Y. Amador, MD
• Giuseppe A. Altamore, DO
• Marina Karamanis, DO
• Joanne Rousseau, DO
• Faiz Ahmed, MD
• Maciej Padowski, DO
• Sean W. Marquis, MD
• Jennifer J. Gibson Chambers, DO

All emergency medicine doctors in Janesville →

Other clinicians in Mercy Health System Corporation

Medicare enrollment lists these clinicians in the same group practice — not a recommendation.

• Leah Lammersfeld, PT
• Jessica A. Wallace
• Debra L. Johnson, CSW
• Madhusudan R. Malladi, MD
• Mustafa Abdul Waheed Mohammed, MD
• Angela Kleinmann

Clinician information

Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.

Sources

1. Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
2. Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
3. National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
4. Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
5. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
6. Medicare Care Compare — official Medicare tool to look up clinicians