Ruonan Zhang, MD

Medicare activity in 2024

Official CMS public-use data for Ruonan Zhang, 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. Flow cytometry technique for dna or cell analysis, 16 or more markers (88189)127 services
2. Special stained specimen slides to examine tissue including interpretation and report (88313)125 services
3. Special stained specimen slides to examine tissue, each additional procedure (88341)104 services
4. Microscopic genetic analysis of tumor, manual (88360)81 services
5. Pathology examination of tissue using a microscope, intermediate complexity (88305)72 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%
• Arthritis57%
• Ischemic heart disease49%
• Chronic kidney disease45%
• Diabetes41%

Hospitals where Ruonan Zhang works

Medicare's Facility Affiliation Data lists Ruonan Zhang 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.

• Community HospitalMunster, IN · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 150125
• Rush Oak Park HospitalOak Park, IL · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 140063
• Rush University Medical CenterChicago, IL · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 140119

Practice locations

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

• 1653 W Congress PkwyChicago, IL 60612 (312) 942‑5000

Group practices

Medicare enrollment lists Ruonan Zhang as a member of this group (CMS data updated October 2, 2026).

• University Pathology Diagnostics SC17 clinicians in the group

Specialties

• Pathologyprimary

Find other Pathology doctors in Illinois →

Other pathologists in Chicago

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

• Jingyang Feng, MD
• Natasha Pello, MD
• Perry Guariglia, MD
• Frances I. Manosca, MD
• Karen Ferrer, MD
• Qing C. Chen, MD
• Liana N. Kozanno, MD
• Elliot S. Weisenberg, MD

All pathologists in Chicago →

Other clinicians in University Pathology Diagnostics SC

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

• Mark D. Pool, MD
• Michael Marshall
• Daniel Russell
• Matthew Vega, MD
• Richard J. Grostern, MD
• Vijaya Reddy, 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