Peter G. Maslak, MD
Hematology (Internal Medicine) Physician · Buffalo, NY
Peter G. Maslak, MD is a hematology (internal medicine) physician with a practice address in Buffalo, New York, and NPI 1265403067, issued on Jan 30, 2006. Check the license (New York 169520, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- Peter G. Maslak
- Credential
- MD
- Primary taxonomy
- Hematology (Internal Medicine) Physician 207RH0000X
- License number
- 169520 NY
Self-reported in NPPES; status is on the state search - Practice location
- Elm And Carlton St, Buffalo, NY 14263
- Phone
- (716) 845-2300
- Enumerated
- Jan 30, 2006
- Record last updated
- Jan 5, 2023
- Medicare enrollment
- Enrolled (PECOS I20100706000740); accepts Medicare assignment
- Medical or professional school
- Icahn School Of Medicine At Mount Sinai, 1984
- Entity
- Type 1 · individual
Also registered at Elm And Carlton St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Steven Abel, RPHPharmacist1649578113
- Anuja AbhyankarMedical Oncology Physician1679181424
- Sara Abou Azar, M.D.Surgery Physician1689103541
- Tina Agostinelli, PAPhysician Assistant1528621885
- Eric Ahn, MDGastroenterology Physician1134528912
- Christine Aiduk, NPObstetrics & Gynecology Nurse Practitioner1255314555
Verify Peter G. Maslak in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNYS Education Department, Office of the Professions
Search for license 169520Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
92% fewer Medicare Part D claims than the average hematology (internal medicine) physician in 2024
38 Medicare Part D claims, against an average of 496 among the 1,036 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Most prescribed
- Acyclovir12 claims
- Entecavir12 claims
- Sulfamethoxazole-Trimethoprim12 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 79 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Roswell Park Cancer InstituteBuffalo, NY
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Hematology (Internal Medicine) Physician providers in New York
There are 161 hematology (internal medicine) physician records in New York.
Other hematology (internal medicine) physician records in New York
- Imo Akpan, M.D.New York, NY1093077208
- Karenza Alexis, MDBronx, NY1053464941
- Jack Ansell, M.D.New York, NY1679559652
- Robert Babcock, M.D.Canandaigua, NY1194787564
- Wadie Bahou, M.D.Stony Brook, NY1891720702
- Ayanna Baptiste, MDBrooklyn, NY1689924763
- Paul Barr, MDRochester, NY1407946460
- Alina Basnet, MDSyracuse, NY1871914465
- Osama Batayneh, MDSyracuse, NY1316556681
- Rita Bellevue, MDBrooklyn, NY1932150844
Common questions
What is Peter G. Maslak, MD's NPI number?
Peter G. Maslak, MD's National Provider Identifier (NPI) is 1265403067, issued on Jan 30, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Peter G. Maslak, MD located?
The NPPES record lists a practice address at Elm And Carlton St, Buffalo, NY, 14263. Phone: (716) 845-2300. Providers update this record themselves, so call before visiting.
How can I verify Peter G. Maslak, MD's license?
NPPES lists New York license number 169520, as entered by the provider. Search the NYS Education Department, Office of the Professions at https://www.op.nysed.gov/services/verifications/online-verification-searches. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Peter G. Maslak, MD prescribe under Medicare Part D?
In 2024, Peter G. Maslak, MD had 38 Medicare Part D claims; the average among hematology (internal medicine) physician prescribers was 496. Part D covers Medicare prescriptions only.
What is Peter G. Maslak, MD's MIPS final score?
The 2023 MIPS final score is 79 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.