Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Janett Williams-Guillaume
Specialist in Mount Vernon, NY · enumerated 2024.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1386483410
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Registry record
Entity type Individual (Type 1)
Name Janett Williams-Guillaume
Sex Female
Practice address 51 S 1st Ave, Mount Vernon, NY, 10550
Phone (917) 579-7657
Enumeration date May 20, 2024
Last updated in NPPES May 20, 2024
Taxonomy & licenses
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
What specialty is Janett Williams-Guillaume?
Janett Williams-Guillaume is registered in NPPES with the primary taxonomy of Specialist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Is this the official NPI registry?
No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-05-20.