Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

M. Jennifer Demarco D.O., LLC

Q: What type of organization is M. Jennifer Demarco D.O., LLC?

M. Jennifer Demarco D.O., LLC is registered in NPPES as a Family Medicine Physician (its primary provider taxonomy).

Family Medicine Physician in Amityville, NY · enumerated 2006 · authorized official Mary Demarco, Doctor.

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

National Provider Identifier

1588749535

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Registry record

Entity type Organization (Type 2)

Legal business name M. Jennifer Demarco D.O., LLC

Practice address 191 Grand Central Ave, Amityville, NY, 11701

Phone (631) 598-2318

Enumeration date Oct 26, 2006

Last updated in NPPES Oct 1, 2007

Taxonomy & classification

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License 219063 (NY) Primary

Authorized official

Name Mary Demarco

Title Doctor

Phone (631) 598-2318

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

What type of organization is M. Jennifer Demarco D.O., LLC?

M. Jennifer Demarco D.O., LLC is registered in NPPES as a Family Medicine Physician (its primary provider taxonomy).

What is a Type 2 NPI?

A Type 2 NPI identifies an organization (group practice, hospital, pharmacy, lab), while Type 1 NPIs identify individual providers. Organizations bill under their Type 2 NPI.

Providers at this address

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M. Demarco Family Medicine Physician · Amityville, NY NPI 1265611131

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-10-01.