Mariusz A. Olszewski, MD

Medicare activity in 2024

Official CMS public-use data for Mariusz A. Olszewski, 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. X-ray of chest, 2 views (71046)316 services
2. Ct scan head or brain without contrast (70450)294 services
3. Ct scan of abdomen and pelvis with contrast (74177)211 services
4. X-ray of chest, 1 view (71045)192 services
5. Ct scan of chest without contrast (71250)138 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%
• Arthritis56%
• Anxiety36%
• Ischemic heart disease34%
• Diabetes33%

Hospitals where Mariusz A. Olszewski works

Medicare's Facility Affiliation Data lists Mariusz A. Olszewski 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.

• Androscoggin Valley HospitalBerlin, NH · Critical Access Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 301310
• Elliot HospitalManchester, NH · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 300012
• Northwestern Lake Forest HospitalLake Forest, IL · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 140130
• Southern NH Medical CenterNashua, NH · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 300020
• Weeks Medical CenterLancaster, NH · Critical Access Hospital · Emergency services: listed by Medicare · CCN 301303

Practice locations

Addresses where Mariusz A. Olszewski is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 15; the Medicare profile lists all.

• 1000 N Westmoreland RdLake Forest, IL 60045 (847) 234‑5600
• 1200 Old York RdAbington, PA 19001 (215) 481‑2222
• 14 Prospect StMilford, MA 01757 (508) 473‑1190
• 201 Lyons AveNewark, NJ 07112 (973) 926‑7000
• 2301 S Broad StPhiladelphia, PA 19148

Group practices

Medicare enrollment lists Mariusz A. Olszewski as a member of these groups (CMS data updated October 2, 2026).

• Northwestern Medical Faculty Foundation4,503 clinicians in the group
• University of Penn - Medical Group3,505 clinicians in the group
• UMass Memorial Medical Group Inc2,516 clinicians in the group
• RWJBH Observation Associates LLC1,008 clinicians in the group
• Methodist Associates in Healthcare, Inc390 clinicians in the group
• Health Services of Central Georgia300 clinicians in the group

Specialties

• Diagnostic Radiologyprimary

Find other Diagnostic Radiology doctors in Illinois →

Other radiologists in Lake Forest

Clinicians with the same Medicare primary specialty in Lake Forest, IL — not a recommendation.

• Manish K. Varma, MD
• Sherazad Islam, MD
• Lioubov Soulii, MD
• Purvak Patel, MD
• Sidney U. Jain, MD
• Ramanujam Prativadi, MD
• Robert A. Breit, MD
• James T. Link, MD

All radiologists in Lake Forest →

Other clinicians in Northwestern Medical Faculty Foundation

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

• Marie T. Altimari, MD
• Sandra Weintraub
• Kyle E. Reynolds, MD
• Diego A. Melendez
• Ann Marie F. Russell, DC
• Mayra A. Bailon, CSW

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