Quick answers
- Does Peter G. Maslak accept Medicare assignment?
- Yes. Medicare's clinician data says Peter G. Maslak accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Peter G. Maslak see?
- In 2024, CMS data shows 130 Original Medicare patients and 149 services for Peter G. Maslak. This counts Original Medicare only and measures volume, not quality.
- What is Peter G. Maslak's NPI number?
- 1265403067. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Peter G. Maslak, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 130 |
|---|---|
| Services billed to Medicare | 149 |
| Different services or procedures | 3 |
| Participating Medicare provider | Yes |
| Average age of these patients | 72 |
Most frequent services
- Pathology clinical consultation for clinical problem, 5-20 minutes (80503)145 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Arthritis45%
- Chronic kidney disease39%
- Anxiety36%
- Diabetes32%
Practice locations
Addresses where Peter G. Maslak is enrolled with Medicare (CMS data updated October 2, 2026).
- Elm and Carlton StBuffalo, NY 14263 (716) 845‑2300
Group practices
Medicare enrollment lists Peter G. Maslak as a member of this group (CMS data updated October 2, 2026).
- Roswell Park Cancer Institute488 clinicians in the group
Specialties
- Hematologyprimary
Other hematologists in Buffalo
Clinicians with the same Medicare primary specialty in Buffalo, NY — not a recommendation.
Other clinicians in Roswell Park Cancer Institute
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Medical school | Icahn School Of Medicine At Mount Sinai |
|---|---|
| Graduation year | 1984 (42 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1265403067 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians