Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mr. William Luis Dereza, LMSW
Social Worker in Highland, NY · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1205856275
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Registry record
Entity type Individual (Type 1)
Name Mr. William Luis Dereza
Credential LMSW
Sex Male
Practice address 106 Vineyard Ave, Highland, NY, 12528
Phone (845) 691-9191
Fax (845) 691-9339
Enumeration date Jul 20, 2006
Last updated in NPPES Jul 8, 2007
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 William Dereza?
William Dereza 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 2007-07-08.