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

Dr. Brian Michael Karaszewski, MD

Individual provider Internal Medicine Physician · NPI 1255478376

Dr. Brian Michael Karaszewski, MD practises Internal Medicine in Williamsville, New York. Graduated from State University of New York at Buffalo School of Medicine in 1997, 29 years ago. Practices with Brain and Spine Medical Services PLLC, a 56-clinician group and accepts Medicare assignment. Licensed in New York.

Years since qualifying
29
Trained at
State University of New York at Buffalo School of Medicine
Licensed in
NY
In the registry since
2007
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

400 International Dr
Williamsville, NY 14221
Phone: (716) 631-3555
Fax: (716) 631-9525
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 213340-1 (NY)

Record details

NPI number1255478376
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedJanuary 30, 2007
Last updated in NPPESAugust 19, 2019

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolSTATE UNIVERSITY OF NEW YORK AT BUFFALO SCHOOL OF MEDICINE
Graduated 1997 (29 years in practice)
Group practice Brain And Spine Medical Services Pllc — 56 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 patients194
Services billed 603 a service is one billed item, such as a visit, a test or a procedure
Average patient age75

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.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $4,057 212 payments · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

  • Kenmore Mercy Hospital Hospital · Kenmore, NY
  • Sisters Of Charity Hospital Hospital · Buffalo, NY
  • Kaleida Health Hospital · Buffalo, NY
  • Mount St. Mary'S Hospital & Health Center Hospital · Lewiston, NY
  • Vna Of Western Ny Chha Home health agency · Cheektowaga, NY

Colleagues at Brain and Spine Medical Services PLLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 56 clinicians in the practice; 12 are shown here.

Other providers in Williamsville