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

Peter G Maslak, MD

Individual provider Hematology (Internal Medicine) Physician · NPI 1265403067

Peter G Maslak, MD is a Hematology in Buffalo, New York. Graduated from Icahn School of Medicine at Mount Sinai in 1984, 42 years ago. Practices with Roswell Park Cancer Institute, a 489-clinician group and accepts Medicare assignment. Licensed in New York.

Years since qualifying
42
Trained at
Icahn School of Medicine at Mount Sinai
Licensed in
NY
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Partly verified

Some contact details are missing from the federal record.

Elm And Carlton St
Buffalo, NY 14263-0001
Phone: (716) 845-2300
Show map & directions

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

Specialties & licences

Hematology (Internal Medicine) Physician (primary) Taxonomy 207RH0000X · Licence 169520 (NY)

Record details

NPI number1265403067
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJanuary 30, 2006
Last updated in NPPESJanuary 5, 2023
Certification dateJanuary 5, 2023

Medicare enrollment

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

Medicare specialtyHEMATOLOGY
Medical schoolICAHN SCHOOL OF MEDICINE AT MOUNT SINAI
Graduated 1984 (42 years in practice)
Group practice Roswell Park Cancer Institute — 489 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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