NINA YTHIER LCSW
NPI 1770755340
Social Worker in Ossining, NY

Q: What is Nina Ythier's NPI number?

The NPI number for Nina Ythier is 1770755340. It was assigned to this individual provider in the NPPES registry on March 24, 2008.

Q: What is Nina Ythier's specialty?

The primary specialty registered for this NPI is Social Worker with taxonomy code 104100000X.

Q: When was this NPI record last updated?

The NPPES record for Nina Ythier was last updated on April 8, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.

Active since March 24, 2008PECOS EnrolledAccepts Medicare Assignment

17 DERBY LN, OSSINING, NY 10562(914) 426-7789 Get Directions Write a Review

NPPES record last updated: April 8, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

On this page

About Nina Ythier Lcsw NPPES

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

NINA YTHIER LCSW (NPI 1770755340) is an individual social worker in Ossining, New York, licensed in New York (0763831) and active in the NPI registry since March 2008. She is enrolled in Medicare PECOS and is a graduate of Other (2005).

NPPES Registry Identity

NPI1770755340

Entity TypeIndividualFemale

Primary Taxonomy104100000X

Provider Legal NameNINA YTHIERCredential: LCSW

Location Address17 DERBY LNOssining, NY 10562-2702

Mailing Address17 Derby LnOssining, NY 10562-2702 · (914) 426-7789

Phone(914) 426-7789

Sole ProprietorNo

Medical School CMSOtherGraduated 2005

Enumeration DateMarch 24, 2008

Last NPPES UpdateApril 8, 2026

NPPES CertifiedApril 8, 2026

✔ NPI 1770755340 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySocial WorkerBehavioral Health & Social Service Providers

Taxonomy Code104100000X

License✔ Licensed in NY · 0763831

Definition

A social worker is a person who is qualified by a Social Work degree, and licensed, certified or registered by the state as a social worker to practice within the scope of that license. A social worker provides assistance and counseling to clients and their families who are dealing with social, emotional and environmental problems. Social work services may be rendered to individuals, families, groups, and the public.

17 DERBY LN, Ossining, NY 10562

Open in Google Maps ↗

Other Identifiers 1

Other1285628552NY · Agency Npi

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 and accepts Medicare assignment

Nina Ythier Lcsw is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID1153738885

PECOS Enrollment IDI20210325001220

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 Reassignments

Medicare enrollment records show Nina Ythier reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Nina Ythier Lcsw PC

Same address

Social Worker

17 DERBY LN
Ossining, NY 10562

Reassigned Medicare billing, New York enrollment
4 clinicians in this Medicare group

NPI 1477210284 (914) 297-9998

Regional Neurological Associates, PC

20 mi

Specialist

4234 BRONX BLVD FRNT 1
Bronx, NY 10466

Reassigned Medicare billing, New York enrollment
14 clinicians in this Medicare group

NPI 1306800057 (718) 515-4347

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

Areas of Expertise CMS Part B claims

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Psychotherapy, 1 hour 90837

Psychotherapy is a therapeutic interaction or treatment between a trained professional and a patient. In a 1-hour session, you'll talk about your feelings, thoughts, and behaviors to help identify and manage mental health issues. This process aids in personal growth, healing, and improved well-being.

1,056 services24 patients

Other Providers at the Same Location NPPES 2

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

SARAH M GONEL

Local Education Agency (LEA)

17 DERBY LN
OSSINING, NY 10562

Westchester County (347) 997-5239

NINA YTHIER LCSW PC

Social Worker

17 DERBY LN
OSSINING, NY 10562

Westchester County (914) 297-9998

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 Nina Ythier's NPI number?

The NPI number for Nina Ythier is 1770755340. It was assigned to this individual provider in the NPPES registry on March 24, 2008.

Where is Nina Ythier located?

Nina Ythier practices at 17 Derby Ln, Ossining, NY 10562. The listed phone number is (914) 426-7789.

What is Nina Ythier's specialty?

The primary specialty registered for this NPI is Social Worker with taxonomy code 104100000X.

Is Nina Ythier enrolled in Medicare?

Yes. Nina Ythier is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Nina Ythier's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Nina Ythier reassigns Medicare benefits to 2 organizations: Nina Ythier Lcsw PC (Ossining, NY) and Regional Neurological Associates, PC (Bronx, NY). Each 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 Nina Ythier's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Nina Ythier accept?

Health plans from Oscar Health list Nina Ythier 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 Nina Ythier was last updated on April 8, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.