Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Martin N. Seif, Ph.D., Psychologist, P.C.

Clinical Psychologist in Greenwich, CT · enumerated 2011 · authorized official Martin Seif, President.

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

National Provider Identifier

1982992491

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Registry record

Entity type Organization (Type 2)

Legal business name Martin N. Seif, Ph.D., Psychologist, P.C.

Practice address 270 Greenwich Ave, Greenwich, CT, 06830

Phone (914) 907-8023

Fax (203) 629-1212

Enumeration date Jul 18, 2011

Last updated in NPPES Apr 24, 2012

Taxonomy & classification

103TC0700X Clinical Psychologist Behavioral Health & Social Service Providers · License 5457 (NY) Primary

Authorized official

Name Martin Seif

Title President

Phone (914) 907-8023

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

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2012-04-24. Verify at npiregistry.cms.hhs.gov.

Where is Martin N. Seif, Ph.D., Psychologist, P.C. located?

The practice location on file with NPPES is in Greenwich, CT.

Providers at this address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-04-24.