Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Mary Tosiou, MD

Individual provider Emergency Medicine Physician · NPI 1801811294

Mary Tosiou, MD is an Emergency Medicine Physician in Berwyn, Illinois. Licensed in Illinois and Michigan. Registered with an NPI since 2006.

Licensed in
IL, MI
In the registry since
2006
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

3249 Oak Park Ave
Berwyn, IL 60402-3429 Not confirmed with CMS for 17 years — call before visiting
Phone: (708) 783-9100
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence 036-103005 (IL)
Emergency Medicine Physician Taxonomy 207P00000X · Licence 4301069892 (MI)

Record details

NPI number1801811294
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 13, 2006
Last updated in NPPESDecember 9, 2008

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 patients193
Services billed 289 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

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.

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