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

Mariana Ostapiuk, AGNP-C

Adult Health Nurse Practitioner in Algonquin, IL · enumerated 2025.

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

National Provider Identifier

1265318927

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Registry record

Entity type Individual (Type 1)

Name Mariana Ostapiuk

Credential AGNP-C

Sex Female

Practice address Algonquin, IL, 60102

Phone (815) 440-7454

Enumeration date Aug 15, 2025

Last updated in NPPES Dec 18, 2025

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

Taxonomy & licenses

363LA2200X Adult Health Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 209033794 (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

Where does Mariana Ostapiuk practice?

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

What is the NPI number for Mariana Ostapiuk?

The National Provider Identifier (NPI) for Mariana Ostapiuk is 1265318927, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-12-18.