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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

MARA NELLIS LCSW
NPI 1003878331
Social Worker - Clinical in New York, NY

Active since April 03, 2006Opted out of Medicare · through Oct 12, 2027
161 W 54TH ST, APT 202, NEW YORK, NY 10019(212) 252-2116 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Jul 13, 2026, Feb 23, 2016 (2 updates tracked since 2016).

About Mara Nellis Lcsw NPPES

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

MARA NELLIS LCSW (NPI 1003878331) is an individual clinical provider in New York, New York, licensed in New York (072722-1) and active in the NPI registry since April 2006. She has opted out of Medicare through October 12, 2027.

NPPES Registry Identity

NPI1003878331
Entity TypeIndividualFemale
Primary Taxonomy1041C0700X
Provider Legal NameMARA NELLISCredential: LCSW
Location Address161 W 54TH ST, APT 202New York, NY 10019-5454
Mailing Address161 W 54th St, Apt 202New York, NY 10019-5454
Phone(212) 252-2116
Sole ProprietorNo
Enumeration DateApril 3, 2006
Last NPPES UpdateJuly 13, 20262 updates tracked since enumeration
✔ NPI 1003878331 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySocial Worker · ClinicalBehavioral Health & Social Service Providers
Taxonomy Code1041C0700X
License✔ Licensed in NY · 072722-1
Definition
A social worker who holds a master's or doctoral degree in social work from an accredited school of social work in addition to at least two years of post-master's supervised experience in a clinical setting. The social worker must be licensed, certified, or registered at the clinical level in the jurisdiction of practice. A clinical social worker provides direct services, including interventions focused on interpersonal interactions, intrapsychic dynamics, and life management issues. Clinical social work services are based on bio-psychosocial perspectives. Services consist of assessment, diagnosis, treatment (including psychotherapy and counseling), client-centered advocacy, consultation, evaluation, and prevention of mental illness, emotional, or behavioral disturbances.
161 W 54TH ST, New York, NY 10019
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

ⓘ

Opted out of Medicare

Mara Nellis Lcsw has filed a Medicare opt-out affidavit. Services are provided under private contract between the provider and the patient, and are not billed to or reimbursed by Medicare. The opt-out is on file from October 12, 2023 through October 12, 2027.

Opt-Out Effective DateOctober 12, 2023
Opt-Out In Effect ThroughOctober 12, 2027Opt-out affidavits renew automatically every two years unless cancelled

Other Providers at the Same Location NPPES 8

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

MS. LETITIA LOUISE MAUN M.A.., M.ED, LMSW
Counselor (Mental Health)
161 W 54TH ST
NEW YORK, NY 10019
New York County (917) 566-4068
MEGAN CLOSE
Marriage & Family Therapist
161 W 54TH ST, SUITE 203
NEW YORK, NY 10019
New York County (860) 983-1544
MS. JILL M. POLLACK LCSW
Social Worker (Clinical)
161 W 54TH ST
NEW YORK, NY 10019
New York County (212) 724-7205
JULIE IANNONE LCSW
Social Worker (Clinical)
161 W 54TH ST
NEW YORK, NY 10019
New York County (917) 940-7555
DR. LAURA NEIMAN PSYD
Psychologist
161 W 54TH ST, SUITE 804
NEW YORK, NY 10019
New York County (917) 690-8744
STRAIGHT TALK PSYCHOTHERAY
Social Worker
161 W 54TH ST, SUITE 804
NEW YORK, NY 10019
New York County (917) 972-6640
MRS. CYNTHIA A. HANNON LCSW
Social Worker (Clinical)
161 W 54TH ST
NEW YORK, NY 10019
New York County (516) 236-6639
DR. YOSHIHIRO YAMAGUCHI L.A.C
Acupuncturist
161 W 54TH ST, SUITE 21
NEW YORK, NY 10019
New York County (212) 246-7588

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 Mara Nellis's NPI number?

The NPI number for Mara Nellis is 1003878331. It was assigned to this individual provider in the NPPES registry on April 3, 2006.

Where is Mara Nellis located?

Mara Nellis practices at 161 W 54th St Apt 202, New York, NY 10019. The listed phone number is (212) 252-2116.

What is Mara Nellis's specialty?

The primary specialty registered for this NPI is Social Worker, specializing in Clinical, with taxonomy code 1041C0700X.

Is Mara Nellis enrolled in Medicare?

No. Mara Nellis has opted out of Medicare through October 12, 2027. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out.

When was this NPI record last updated?

The NPPES record for Mara Nellis was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 36 days 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.