Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Cassandra Williams, PMHNP

Psychiatric/Mental Health Nurse Practitioner in Mount Vernon, NY · enumerated 2014.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1851796957

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Registry record

Entity type Individual (Type 1)

Name Cassandra Williams

Credential PMHNP

Sex Female

Practice address Mount Vernon, NY, 10552

Phone (347) 264-7101

Enumeration date Oct 31, 2014

Last updated in NPPES Nov 21, 2022

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

163W00000X Registered Nurse Nursing Service Providers · License 691006 (NY) Secondary

363LP0808X Psychiatric/Mental Health Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 404549 (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.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does Cassandra Williams practice?

The practice location on file with NPPES is in Mount Vernon, NY. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Cassandra Williams?

The National Provider Identifier (NPI) for Cassandra Williams is 1851796957, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-11-21.