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

Dr. Isadora Guggenheim, FNP

Nurse Practitioner in Nyack, NY · enumerated 2008.

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

National Provider Identifier

1851551519

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Registry record

Entity type Individual (Type 1)

Name Dr. Isadora Guggenheim

Credential FNP

Sex Female

Practice address Nyack, NY, 10960

Phone (845) 893-2608

Fax (845) 358-2963

Enumeration date Jun 16, 2008

Last updated in NPPES Oct 6, 2020

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

Taxonomy & licenses

2083P0500X Preventive Medicine/Occupational Environmental Medicine Physician Allopathic & Osteopathic Physicians · License 000303 (CT) Secondary

363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License F342569-01 (NY) Primary

FNP · Family Nurse Practitioner: A nurse practitioner certified in family practice across the lifespan. About the FNP credential

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 Isadora Guggenheim practice?

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

What is the NPI number for Isadora Guggenheim?

The National Provider Identifier (NPI) for Isadora Guggenheim is 1851551519, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-10-06.