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

Ms. Mary Therese Harrington, LCSW

Addiction (Substance Use Disorder) Counselor in Irvington, NY · enumerated 2005 · practices at Sloane Stecker Physical Therapy PC.

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

National Provider Identifier

1124004254

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Registry record

Entity type Individual (Type 1)

Name Ms. Mary Therese Harrington

Credential LCSW

Sex Female

Practice address Irvington, NY, 10533

Phone (914) 589-3293

Fax (914) 667-1494

Enumeration date Dec 20, 2005

Last updated in NPPES Sep 11, 2025

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

Taxonomy & licenses

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License R055967 (NY) Secondary

106H00000X Marriage & Family Therapist Behavioral Health & Social Service Providers · License R055967 (NY) Secondary

101YA0400X Addiction (Substance Use Disorder) Counselor Behavioral Health & Social Service Providers · License R055967 (NY) Primary

LCSW · Licensed Clinical Social Worker: A social worker licensed for clinical practice including mental-health therapy. About the LCSW credential

Other identifiers

Identifier	Type	State	Issuer
02753280	Medicaid	NY	-
789463	Other	NY	AETNA
P3663895	Other	NY	OXFORD

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.

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Frequently asked questions

What specialty is Mary Harrington?

Mary Harrington is registered in NPPES with the primary taxonomy of Addiction (Substance Use Disorder) Counselor. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

Other providers at this practice address

Browse all →

Sloane Stecker Physical Therapy PC Physical Therapist · Irvington, NY NPI 1083717870 Heather Goldman Clinical Psychologist · Irvington, NY NPI 1881714608 Michael Mermin Clinical Social Worker · Irvington, NY NPI 1639385545 Adam Stein Clinical Psychologist · Irvington, NY NPI 1225230055 Pooja Mehta Physical Therapist · Irvington, NY NPI 1003228834 Nicolo Potestio Orthopedic Physical Therapist · Irvington, NY NPI 1447600382

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-09-11.