NPI Portal NPI Lookup & Verification

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

Eleonor Eustace

Internal Medicine Physician in Brewster, NY · enumerated 2016 · practices at Eastern New York Medical Services PC.

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

National Provider Identifier

1558723809

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Registry record

Entity type Individual (Type 1)
Name Eleonor Eustace
Sex Female
Practice address Brewster, NY, 10509
Phone (845) 279-7200
Fax (203) 739-1883
Enumeration date Mar 25, 2016
Last updated in NPPES Mar 29, 2022

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

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 66910 (CT) Secondary
390200000X Student in an Organized Health Care Education/Training Program Student, Health Care Secondary
207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 1696095 (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.

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Frequently asked questions

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.
What specialty is Eleonor Eustace?
Eleonor Eustace is registered in NPPES with the primary taxonomy of Internal Medicine Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-03-29.