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

Dr. Mark Sieminski, MD

Individual provider Emergency Medicine Physician · NPI 1003057779

Dr. Mark Sieminski, MD practises Emergency Medicine in Cheektowaga, New York. Graduated from University of Virginia School of Medicine in 2005, 21 years ago. Practices with University Emergency Medical Services Inc, a 91-clinician group and accepts Medicare assignment. Licensed in Illinois.

Years since qualifying
21
Trained at
University of Virginia School of Medicine
Licensed in
IL
In the registry since
2009
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

305 Cayuga Rd Ste 190
Cheektowaga, NY 14225-1980 Not confirmed with CMS for 17 years — call before visiting
Phone: (716) 580-1813
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

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

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence 125051569 (IL)

Record details

NPI number1003057779
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedMarch 10, 2009
Last updated in NPPESOctober 20, 2009

Medicare enrollment

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

Medicare specialtyEMERGENCY MEDICINE
Medical schoolUNIVERSITY OF VIRGINIA SCHOOL OF MEDICINE
Graduated 2005 (21 years in practice)
Group practice University Emergency Medical Services Inc. — 91 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 patients249
Services billed 335 a service is one billed item, such as a visit, a test or a procedure
Average patient age71

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.

  • Kaleida Health Hospital · Buffalo, NY

Colleagues at University Emergency Medical Services Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 91 clinicians in the practice; 12 are shown here.

Other providers in Cheektowaga