Stefan L. Zimmerman, MD

Medicare activity in 2024

Official CMS public-use data for Stefan L. Zimmerman, 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. Low osmolar contrast material, 300-399 mg/ml iodine concentration, per ml (Q9967)20,141 services
2. Injection, gadobutrol, 0.1 ml (A9585)1,500 services
3. X-ray of chest, 1 view (71045)382 services
4. Ct scan of chest without contrast (71250)264 services
5. Ct scan of abdomen and pelvis with contrast (74177)179 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%
• Arthritis52%
• Ischemic heart disease45%
• Diabetes37%
• Chronic kidney disease33%

Hospitals where Stefan L. Zimmerman works

Medicare's Facility Affiliation Data lists Stefan L. Zimmerman 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.

• Johns Hopkins Bayview Medical CenterBaltimore, MD · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 210029
• The Johns Hopkins HospitalBaltimore, MD · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 210009
• Tidalhealth Peninsula Regional, IncSalisbury, MD · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 210019

Practice locations

Addresses where Stefan L. Zimmerman is enrolled with Medicare (CMS data updated October 2, 2026).

• 5755 Cedar LnColumbia, MD 21044 (410) 740‑7890
• 6201 Greenleigh AveMiddle River, MD 21220

Group practices

Medicare enrollment lists Stefan L. Zimmerman as a member of these groups (CMS data updated October 2, 2026).

• Johns Hopkins University2,909 clinicians in the group
• Johns Hopkins University713 clinicians in the group

Specialties

• Diagnostic Radiologyprimary

Find other Diagnostic Radiology doctors in Maryland →

Other radiologists in Columbia

Clinicians with the same Medicare primary specialty in Columbia, MD — not a recommendation.

• Alphonso L. Dial, MD
• Richard F. Reaven, MD
• Jessica L. Record, MD
• Philip Di Carlo, MD
• Nick N. Lomis, MD
• Laura M. Fayad, MD
• Florentino Saenz, MD
• Jenny Hoang, MD

All radiologists in Columbia →

Other clinicians in Johns Hopkins University

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

• Govind Warrier, MD
• Sarah Syed, MD
• Richard M. Marcinko, PA
• Mary Elizabeth Younger, NP
• Sima Rozati, MD
• George S. Liu, 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