Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Maria Florencia Olsen
Social Worker in Islip, NY · enumerated 2020.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1336771641
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Registry record
Entity type Individual (Type 1)
Name Maria Florencia Olsen
Sex Female
Practice address 401 Main St, Islip, NY, 11751
Phone (631) 446-1950
Enumeration date Feb 5, 2020
Last updated in NPPES Mar 29, 2021
Taxonomy & licenses
104100000X Social Worker Behavioral Health & Social Service Providers · License 112015-01 (NY) Primary
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 Maria Olsen?
Maria Olsen is registered in NPPES with the primary taxonomy of Social Worker. 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 2021-03-29.