Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

John M Evelsizer Olson, PA-C

Surgical Physician Assistant in Decorah, IA · enumerated 2010.

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

National Provider Identifier

1639483001

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Registry record

Entity type Individual (Type 1)

Name John M Evelsizer Olson

Credential PA-C

Sex Male

Practice address 901 Montgomery St, Decorah, IA, 52101

Phone (563) 382-2911

Fax (563) 387-3102

Enumeration date Jul 28, 2010

Last updated in NPPES Jan 13, 2025

Taxonomy & licenses

363AM0700X Medical Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 082179 (IA) Secondary

363AS0400X Surgical Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 082179 (IA) Primary

Other identifiers

Identifier	Type	State	Issuer
1639483001	Medicaid	IA	-

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 1639483001 active?

Yes, as of the latest NPPES snapshot, NPI 1639483001 is active (record last updated 2025-01-13).

How do I verify John Evelsizer Olson's NPI record?

Cross-check NPI 1639483001 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-01-13.