Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Allyson Massimi, CDN, RDN
Registered Dietitian in Hamburg, NY · enumerated 2025.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1154213932
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Registry record
Entity type Individual (Type 1)
Name Allyson Massimi
Credential CDN, RDN
Sex Female
Practice address 4743 Clark St, Hamburg, NY, 14075
Phone (716) 783-2676
Enumeration date Jul 16, 2025
Last updated in NPPES Jul 16, 2025
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 Allyson Massimi?
Allyson Massimi is registered in NPPES with the primary taxonomy of Registered Dietitian. 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 2025-07-16.