Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Stephen E. Tosi, M.D.
Urology Physician in Worcester, MA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1558334045
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Registry record
Entity type Individual (Type 1)
Name Stephen E. Tosi
Credential M.D.
Sex Male
Practice address 291 Lincoln St, Suite 201, Worcester, MA, 01605
Phone (508) 755-8663
Fax (508) 753-4731
Enumeration date Feb 7, 2006
Last updated in NPPES Oct 27, 2020
Taxonomy & licenses
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 |
|---|---|---|---|
| 110037283A | Medicaid | MA | - |
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.
Frequently asked questions
Where does Stephen Tosi practice?
The practice location on file with NPPES is in Worcester, MA. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Stephen Tosi?
The National Provider Identifier (NPI) for Stephen Tosi is 1558334045, a Type 1 (individual) record in the CMS NPPES registry.
Other providers at this practice address
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-10-27.