Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Cassandra Williams, DVM
Veterinarian in West Islip, NY · enumerated 2011.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1992002000
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Registry record
Entity type Individual (Type 1)
Name Dr. Cassandra Williams
Credential DVM
Sex Female
Practice address 75 Sunrise Hwy, West Islip, NY, 11795
Phone (631) 587-0800
Fax (631) 587-2006
Enumeration date Feb 25, 2011
Last updated in NPPES Feb 25, 2011
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 is the NPI number for Cassandra Williams?
The National Provider Identifier (NPI) for Cassandra Williams is 1992002000, a Type 1 (individual) record in the CMS NPPES registry.
Where does Cassandra Williams practice?
The practice location on file with NPPES is in West Islip, NY. Providers can have multiple locations; NPPES lists the primary practice address.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-02-25.