Nicholas Jaszczak, MD

Medicare activity in 2024

Official CMS public-use data for Nicholas Jaszczak, 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. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)36 services
2. Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)34 services
3. Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes (99231)20 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 cholesterol70%
• Arthritis59%
• Chronic kidney disease48%
• Diabetes47%
• Heart failure47%

Hospitals where Nicholas Jaszczak works

Medicare's Facility Affiliation Data lists Nicholas Jaszczak 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.

• The University of Chicago Medical CenterChicago, IL · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 140088

Practice locations

Addresses where Nicholas Jaszczak is enrolled with Medicare (CMS data updated October 2, 2026).

• 5841 S Maryland AveChicago, IL 60637 (773) 702‑1000

Group practices

Medicare enrollment lists Nicholas Jaszczak as a member of these groups (CMS data updated October 2, 2026).

• University of Chicago1,712 clinicians in the group
• The University of Chicago Medical Center915 clinicians in the group

Specialties

• General Surgeryprimary

Find other General Surgery doctors in Illinois →

Other general surgeons in Chicago

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

• Alemayehu Bekele, MD
• Daniel P. Delahunta, MD
• Susan E. Rowell, MD
• Jennifer Y. Gambla, MD
• Eric S. Hungness, MD
• Kirtie Lo, MD
• Michele M. Everett, MD
• Steven J. Schwulst, MD

All general surgeons in Chicago →

Other clinicians in University of Chicago

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

• Steven M. Zangan, MD
• Bradford Chong, MD
• Mark J. Ratain, MD
• Debra D. Baines, MD
• Fatima A. Aldarweesh, MD
• Brittany-Lee Roberts, MD

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