Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Stephannie Anne Siwik-Simpson, NP

Adult Health Nurse Practitioner in Greenwich, NY · enumerated 2022.

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

National Provider Identifier

1578272597

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Registry record

Entity type Individual (Type 1)

Name Stephannie Anne Siwik-Simpson

Credential NP

Sex Female

Practice address 1134 Ny State Route 29, Greenwich, NY, 12834

Phone (185) 692-9861

Enumeration date Nov 17, 2022

Last updated in NPPES Aug 24, 2023

Taxonomy & licenses

363LA2200X Adult Health Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 310919 (NY) Primary

NP · Nurse Practitioner: An advanced practice registered nurse with graduate training, licensed to diagnose and treat, often with prescriptive authority. About the NP 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 Stephannie Siwik-Simpson practice?

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

What is the NPI number for Stephannie Siwik-Simpson?

The National Provider Identifier (NPI) for Stephannie Siwik-Simpson is 1578272597, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-08-24.