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

Ms. Sierra Nicole Genster

Psychiatric/Mental Health Nurse Practitioner in Streamwood, IL · enumerated 2025.

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

National Provider Identifier

1124983523

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Registry record

Entity type Individual (Type 1)

Name Ms. Sierra Nicole Genster

Sex Female

Practice address Streamwood, IL, 60107

Phone (847) 281-5394

Enumeration date Dec 17, 2025

Last updated in NPPES Dec 17, 2025

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

Taxonomy & licenses

363LP0808X Psychiatric/Mental Health Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 043136335 (IL) 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.

Read the full guide → Validate an NPI →

Frequently asked questions

Is NPI 1124983523 active?

Yes, as of the latest NPPES snapshot, NPI 1124983523 is active (record last updated 2025-12-17).

How do I verify Sierra Genster's NPI record?

Cross-check NPI 1124983523 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-12-17.