Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Arianna Monica Williams, LMHC

Mental Health Counselor in New Rochelle, NY · enumerated 2024 · practices at Alssaro Counseling Services, Lcsw, Pllc.

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

National Provider Identifier

1891565099

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Registry record

Entity type Individual (Type 1)

Name Arianna Monica Williams

Credential LMHC

Sex Female

Practice address 481 Main St Ste 401, New Rochelle, NY, 10801

Phone (914) 355-2440

Enumeration date Jan 8, 2024

Last updated in NPPES Jan 29, 2026

Taxonomy & licenses

101YM0800X Mental Health Counselor Behavioral Health & Social Service Providers Secondary

101YM0800X Mental Health Counselor Behavioral Health & Social Service Providers · License 017433 (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 Arianna Williams practice?

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

What is the NPI number for Arianna Williams?

The National Provider Identifier (NPI) for Arianna Williams is 1891565099, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Yhatrid Algarin Clinical Social Worker · New Rochelle, NY NPI 1447293642 Alssaro Counseling Services, Lcsw, Pllc Clinical Social Worker · New Rochelle, NY NPI 1790890135 Joshua Despain Mental Health Counselor · New Rochelle, NY NPI 1295009504 Katherine Gallagher Clinical Social Worker · New Rochelle, NY NPI 1457798183 Pilar Walker Mental Health Counselor · New Rochelle, NY NPI 1447755160 Tamar Romano Marriage & Family Therapist · New Rochelle, NY NPI 1215421011 Joi Britt Clinical Social Worker · New Rochelle, NY NPI 1194208850 Jessica Carpio Clinical Social Worker · New Rochelle, NY NPI 1003399429

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-01-29.