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ARIANNA MONICA WILLIAMS LMHC
NPI 1891565099
Counselor - Mental Health in New Rochelle, NY

Active since January 08, 2024PECOS Enrolled
481 MAIN ST STE 401, NEW ROCHELLE, NY 10801(914) 355-2440 Get Directions Write a Review

NPPES record last updated: January 29, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Jan 29, 2026, Feb 17, 2025 (2 updates tracked since 2025).

About Arianna Monica Williams Lmhc NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

ARIANNA MONICA WILLIAMS LMHC (NPI 1891565099) is an individual mental health provider in New Rochelle, New York, licensed in New York (017433) and active in the NPI registry since January 2024. She is enrolled in Medicare PECOS and is a graduate of Other (2023).

NPPES Registry Identity

NPI1891565099
Entity TypeIndividualFemale
Primary Taxonomy101YM0800X
Provider Legal NameARIANNA MONICA WILLIAMSCredential: LMHC
Location Address481 MAIN ST STE 401New Rochelle, NY 10801-6360
Mailing Address481 Main St Ste 401New Rochelle, NY 10801-6360 · (914) 355-2440
Phone(914) 355-2440
Sole ProprietorNo
Medical School CMSOtherGraduated 2023
Enumeration DateJanuary 8, 2024
Last NPPES UpdateJanuary 29, 20262 updates tracked since enumeration
NPPES CertifiedJanuary 29, 2026
✔ NPI 1891565099 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyCounselor · Mental HealthBehavioral Health & Social Service Providers
Taxonomy Code101YM0800X
License✔ Licensed in NY · 017433
481 MAIN ST STE 401, New Rochelle, NY 10801
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Oscar Health.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Arianna Monica Williams Lmhc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID6103305917
PECOS Enrollment IDI20260211001080
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment– Home Health Agency– Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Arianna Williams reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Alssaro Counseling Services, Lcsw, PLLC
Same address
Clinical
481 MAIN ST STE 401
New Rochelle, NY 10801
  • Reassigned Medicare billing, New York enrollment
  • 28 clinicians in this Medicare group
NPI 1790890135 (914) 355-2440

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MS. JESSICA CARPIO
Social Worker (Clinical)
481 MAIN ST STE 401
NEW ROCHELLE, NY 10801
Westchester County (914) 668-8938
TAYLOR RIBOTSKY
Social Worker
481 MAIN ST STE 401
NEW ROCHELLE, NY 10801
Westchester County (914) 355-2440
ANGELA GIARDINA MSW
Social Worker
481 MAIN ST STE 401
NEW ROCHELLE, NY 10801
Westchester County (914) 355-2440
DIANA VILLADA
Social Worker
481 MAIN ST STE 401
NEW ROCHELLE, NY 10801
Westchester County (914) 355-2440
ROSELINE S TAYLOR LMSW
Social Worker
481 MAIN ST STE 401
NEW ROCHELLE, NY 10801
Westchester County (914) 355-2440
JOI BRITT LCSW
Social Worker (Clinical)
481 MAIN ST STE 401
NEW ROCHELLE, NY 10801
Westchester County (914) 355-2440
TAMAR ROMANO MFT
Marriage & Family Therapist
481 MAIN ST STE 401
NEW ROCHELLE, NY 10801
Westchester County (914) 355-2440
DIANNA JOSEPHINE TORRES
Counselor (Mental Health)
481 MAIN ST STE 401
NEW ROCHELLE, NY 10801
Westchester County (914) 355-2440

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Arianna Williams's NPI number?

The NPI number for Arianna Williams is 1891565099. It was assigned to this individual provider in the NPPES registry on January 8, 2024.

Where is Arianna Williams located?

Arianna Williams practices at 481 Main St Ste 401, New Rochelle, NY 10801. The listed phone number is (914) 355-2440.

What is Arianna Williams's specialty?

The primary specialty registered for this NPI is Counselor, specializing in Mental Health, with taxonomy code 101YM0800X.

Is Arianna Williams enrolled in Medicare?

Yes. Arianna Williams is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Arianna Williams's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Arianna Williams reassigns Medicare benefits to Alssaro Counseling Services, Lcsw, PLLC (New Rochelle, NY). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Arianna Williams's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Arianna Williams accept?

Health plans from Oscar Health list Arianna Williams as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Arianna Williams was last updated on January 29, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.