Grazyna J. Siwy, MD

Medicare activity in 2024

Official CMS public-use data for Grazyna J. Siwy, 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. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)178 services
2. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)21 services
3. Anticoagulant management of patient taking warfarin (93793)19 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%
• Diabetes47%
• High cholesterol43%
• Arthritis33%
• Chronic kidney disease30%
• Ischemic heart disease28%

Hospitals where Grazyna J. Siwy works

Medicare's Facility Affiliation Data lists Grazyna J. Siwy 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

Practice locations

Addresses where Grazyna J. Siwy is enrolled with Medicare (CMS data updated October 2, 2026).

• 1901 W Harrison StChicago, IL 60612 (312) 633‑7292
• 4800 W Chicago AveChicago, IL 60651 (773) 826‑9600
• 500 E 51st StChicago, IL 60615 (312) 572‑2000

Group practices

Medicare enrollment lists Grazyna J. Siwy as a member of this group (CMS data updated October 2, 2026).

• Cook County788 clinicians in the group

Specialties

• General Practiceprimary

Find other General Practice doctors in Illinois →

Other general practitioners in Chicago

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

• Amit Joshi, MD
• Leila N. Patterson
• Atul Joshi, MD
• Queen N. Aghaji, MD
• Fon Y. Wu, MD
• Raj K. Khurana, MD
• Bala Kanagaraju, MD
• John P. Case, MD

All general practitioners in Chicago →

Other clinicians in Cook County

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

• Lisa A. Naftzger Kang, NP
• Katherine Mejia
• Laurel M. Clark, MD
• Paul J. Mullarkey, MD
• Sanford Baim, MD
• Frederic L. Starr, 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