Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

John William Poss, NP

Nurse Practitioner in Oshkosh, WI · enumerated 2005.

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

National Provider Identifier

1578551172

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Registry record

Entity type Individual (Type 1)

Name John William Poss

Credential NP

Sex Male

Practice address 855 N Westhaven Dr, Oshkosh, WI, 54904

Phone (920) 456-7408

Enumeration date Oct 10, 2005

Last updated in NPPES Dec 1, 2021

Taxonomy & licenses

363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 88433 (WI) Primary

NP · Nurse Practitioner: An advanced practice registered nurse with graduate training, licensed to diagnose and treat, often with prescriptive authority. About the NP credential

Other identifiers

Identifier	Type	State	Issuer
43812500	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 John Poss's NPI record?

Cross-check NPI 1578551172 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1578551172 active?

Yes, as of the latest NPPES snapshot, NPI 1578551172 is active (record last updated 2021-12-01).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-12-01.