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

Mrs. Mary Theresa Giammanco

Specialist in East Islip, NY · enumerated 2013.

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

National Provider Identifier

1568890267

Verified

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Registry record

Entity type Individual (Type 1)

Name Mrs. Mary Theresa Giammanco

Sex Female

Practice address East Islip, NY, 11730

Phone (631) 835-6936

Enumeration date Oct 16, 2013

Last updated in NPPES Oct 16, 2013

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

Taxonomy & licenses

174400000X Specialist Other Service Providers · License 980594 (NY) Primary

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.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does Mary Giammanco practice?

The practice location on file with NPPES is in East Islip, NY. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Mary Giammanco?

The National Provider Identifier (NPI) for Mary Giammanco is 1568890267, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-10-16.