NPI Portal NPI Lookup & Verification

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

Mrs. Katherine Helen Mittelbrun

Peer Specialist in Elgin, IL · enumerated 2024.

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

National Provider Identifier

1659103802

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Registry record

Entity type Individual (Type 1)
Name Mrs. Katherine Helen Mittelbrun
Sex Female
Practice address Elgin, IL, 60123
Phone (331) 901-7476
Enumeration date Aug 16, 2024
Last updated in NPPES Aug 16, 2024

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

Taxonomy & licenses

175T00000X Peer Specialist Other Service Providers 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.

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Frequently asked questions

How do I verify Katherine Mittelbrun's NPI record?
Cross-check NPI 1659103802 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1659103802 active?
Yes, as of the latest NPPES snapshot, NPI 1659103802 is active (record last updated 2024-08-16).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-08-16.