Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Demy Ann Sebastian, FNP

Family Nurse Practitioner in Valhalla, NY · enumerated 2021.

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

National Provider Identifier

1629667100

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Registry record

Entity type Individual (Type 1)

Name Demy Ann Sebastian

Credential FNP

Sex Female

Practice address 100 Woods Rd, Valhalla, NY, 10595

Phone (914) 493-7031

Enumeration date Jan 11, 2021

Last updated in NPPES Jan 11, 2021

Taxonomy & licenses

363LF0000X Family Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License F345558-01 (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

How do I verify Demy Sebastian's NPI record?

Cross-check NPI 1629667100 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1629667100 active?

Yes, as of the latest NPPES snapshot, NPI 1629667100 is active (record last updated 2021-01-11).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-01-11.