Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Diana Guaraca
Optician in Islandia, NY · enumerated 2025.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1518836899
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Registry record
Entity type Individual (Type 1)
Name Diana Guaraca
Sex Female
Practice address 1850 Veterans Memorial Hwy, Islandia, NY, 11749
Phone (631) 851-1564
Fax (631) 851-1688
Enumeration date Nov 4, 2025
Last updated in NPPES Nov 4, 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
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.
What specialty is Diana Guaraca?
Diana Guaraca is registered in NPPES with the primary taxonomy of Optician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Other providers at this practice address
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-11-04.