Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Matthew J Armstrong, APNP

Nurse Practitioner in Appleton, WI · enumerated 2006.

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

National Provider Identifier

1326121898

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Registry record

Entity type Individual (Type 1)

Name Matthew J Armstrong

Credential APNP

Sex Male

Practice address 2575 E Evergreen Drive, Pediatric Urology, Appleton, WI, 54913

Phone (920) 969-5353

Fax (414) 337-7201

Enumeration date Oct 20, 2006

Last updated in NPPES Jul 10, 2023

Taxonomy & licenses

363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 2420-083 (WI) Primary

Other identifiers

Identifier	Type	State	Issuer
1326121898	Medicaid	WI	-
41192600	Medicaid	WI	-

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

How do I verify Matthew Armstrong's NPI record?

Cross-check NPI 1326121898 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1326121898 active?

Yes, as of the latest NPPES snapshot, NPI 1326121898 is active (record last updated 2023-07-10).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-07-10.