John E Tomaszewski, MD
John E Tomaszewski is a Anatomic Pathology Physician provider (Pathology) practicing in Buffalo, NY, registered in the NPPES registry with NPI 1417993601 since 2006. The credential MD stands for Doctor of Medicine.
✓ Active NPI ✓ Valid NPI checksum
| NPI | 1417993601 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | John E Tomaszewski |
| Credential | MD |
| Sex | Male |
| Practice address | 100 HIGH ST, Buffalo, NY, 14203 |
| Phone | 7168595600 |
| Enumeration date | 2006-06-22 |
| Last updated in NPPES | 2011-10-10 |
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 207ZP0101X | Anatomic Pathology Physician | Primary | MD020859 | PA |
MD — Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 0011063450002 | Medicaid | PA | — |
Copy-ready billing details
Provider: John Tomaszewski, MD NPI: 1417993601 Taxonomy: 207ZP0101X (Anatomic Pathology Physician) Address: 100 HIGH ST, Buffalo, NY, 14203
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1093712077 | Kristen Salvamoser | Individual | Medical Physician Assistant | Buffalo, NY |
| 1083611982 | James Conley | Individual | Interventional Cardiology Physician | Buffalo, NY |
| 1699768283 | Gary Grosner | Individual | Specialist | Buffalo, NY |
| 1417940008 | A Lewin | Individual | Specialist | Buffalo, NY |
| 1962481911 | Sonya Noor | Individual | Vascular Surgery Physician | Buffalo, NY |
| 1710957501 | Bianca Weinstock Guttman | Individual | Neurology Physician | Buffalo, NY |
| 1780655894 | Margaret Umhauer | Individual | Adult Health Nurse Practitioner | Buffalo, NY |
| 1093786287 | Theodore Ondracek | Individual | Clinical Pathology/Laboratory Medicine Physician | Buffalo, NY |
Verify this record
Cross-check NPI 1417993601 against the authoritative CMS record: view John E Tomaszewski on the official NPPES registry .
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes — even if the provider moves or changes specialty. Read the full guide or validate an NPI number.
Frequently asked questions
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Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2011-10-10.