Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Jacob Sidney Iwaszewski, M.S.

Student in an Organized Health Care Education/Training Program in Sierra Madre, CA · enumerated 2007.

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

National Provider Identifier

1679777973

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Registry record

Entity type Individual (Type 1)

Name Mr. Jacob Sidney Iwaszewski

Credential M.S.

Sex Male

Practice address 665 W Sierra Madre Blvd Apt 2, Sierra Madre, CA, 91024

Phone (626) 355-2468

Enumeration date Jun 12, 2007

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

390200000X Student in an Organized Health Care Education/Training Program Student, Health Care 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 1679777973 active?

Yes, as of the latest NPPES snapshot, NPI 1679777973 is active (record last updated 2007-07-08).

How do I verify Jacob Iwaszewski's NPI record?

Cross-check NPI 1679777973 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 2007-07-08.