Matthew Grzywinski, MD

Medicare activity in 2024

Official CMS public-use data for Matthew Grzywinski, 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. Emergency department visit with high level of medical decision making (99285)182 services
2. Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)111 services
3. Emergency department visit with moderate level of medical decision making (99284)79 services
4. Emergency department visit with low level of medical decision making (99283)17 services
5. Critical care, first 30-74 minutes (99291)14 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%
• Ischemic heart disease42%
• Depression42%
• Chronic kidney disease42%

Hospitals where Matthew Grzywinski works

Medicare's Facility Affiliation Data lists Matthew Grzywinski 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.

• Mercy Medical Center IncBaltimore, MD · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 210008

Practice locations

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

• 301 Saint Paul PlBaltimore, MD 21202 (410) 332‑9000

Group practices

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

• Emergency Physicians SPPS20 clinicians in the group

Specialties

• Emergency Medicineprimary

Find other Emergency Medicine doctors in Maryland →

Other emergency medicine doctors in Baltimore

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

• Robert Otoole, MD
• Kamna S. Balhara, MD
• Michael R. Ehmann, MD
• Siamak Moayedi, MD
• Eric Lieu, MD
• Gabor Kelen, MD
• Amelia Pousson, MD
• Ellen F. Lemkin

All emergency medicine doctors in Baltimore →

Other clinicians in Emergency Physicians SPPS

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

• Nilocent Antonio, NP
• Nicholas Rizer, MD
• Samuel A. Shulimson, DO
• Jennifer Y. Wang, MD
• Robert Flint, MD
• Gabriella M. Miller, 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