Renee B. Marszalek, MD

Medicare activity in 2024

Official CMS public-use data for Renee B. Marszalek, 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. Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)171 services
2. Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)17 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 cholesterol75%
• Arthritis65%
• Heart failure57%
• Chronic kidney disease54%
• Ischemic heart disease53%

Hospitals where Renee B. Marszalek works

Medicare's Facility Affiliation Data lists Renee B. Marszalek 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.

• Aurora BayCare Medical CenterGreen Bay, WI · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 520193
• Aurora Medical Center Bay AreaMarinette, WI · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 520113

Practice locations

Addresses where Renee B. Marszalek is enrolled with Medicare (CMS data updated October 2, 2026).

• 36500 Aurora DrSummit, WI 53066 (262) 434‑5000

Group practices

Medicare enrollment lists Renee B. Marszalek as a member of this group (CMS data updated October 2, 2026).

• Aurora Medical Group, Inc.3,813 clinicians in the group

Specialties

• Internal Medicineprimary

Find other Internal Medicine doctors in Wisconsin →

Other internal medicine doctors in Summit

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

• Andrey Strunets, MD
• Jafar S. Mohammed, MD
• Junwei Liu, MD
• Varun Mehta, MD
• Brett T. Mittelstedt, DO
• Miguel A. Reyes Chavez, MD
• Ethan B. Rosen, MD

All internal medicine doctors in Summit →

Other clinicians in Aurora Medical Group, Inc.

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

• Sarah M. Stauder, MD
• Jonathan Stein, MD
• Kimberly P. Kocher, PA
• Michael C. Groeschel, PA
• Zahid Shuttari, MD
• Alexander Korittnig, CNA

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