Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.

Simon J Ostrowski, MD

Individual provider Emergency Medicine Physician · NPI 1184245979

Simon J Ostrowski, MD practises Emergency Medicine in Worcester, Massachusetts. Graduated from University of Massachusetts Medical School in 2020, 6 years ago. Practices with Umass Memorial Medical Group Inc, a 2,467-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Massachusetts and Pennsylvania.

Years since qualifying
6
Trained at
University of Massachusetts Medical School
Licensed in
MA, PA
In the registry since
2020
Specialties on file
3
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

55 Lake Ave N
Worcester, MA 01655-0002
Phone: (508) 421-1401
Fax: (508) 421-1490
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 200 Lothrop St, Pittsburgh, PA 15213-2536 — (412) 647-8262

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence 1021958 (MA)
Emergency Medicine Physician Taxonomy 207P00000X · Licence MD481030 (PA)
Medical Toxicology (Emergency Medicine) Physician Taxonomy 207PT0002X · Licence 1021958 (MA)

Record details

NPI number1184245979
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMay 3, 2020
Last updated in NPPESMarch 18, 2025
Certification dateMarch 18, 2025

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyEMERGENCY MEDICINE
Also practisesMEDICAL TOXICOLOGY
Medical schoolUNIVERSITY OF MASSACHUSETTS MEDICAL SCHOOL
Graduated 2020 (6 years in practice)
Group practice Umass Memorial Medical Group Inc — 2467 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients69
Services billed 104 a service is one billed item, such as a visit, a test or a procedure
Average patient age72

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Umass Memorial Medical Group Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 2467 clinicians in the practice; 12 are shown here.

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