Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Jeffrey A Willis, PA

Physician Assistant in Mequon, WI · enumerated 2006.

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

National Provider Identifier

1558388520

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Registry record

Entity type Individual (Type 1)

Name Jeffrey A Willis

Credential PA

Sex Male

Practice address 10945 N Port Washington Rd Ste 201, Mequon, WI, 53092

Phone (262) 292-3151

Enumeration date Jul 16, 2006

Last updated in NPPES Dec 10, 2025

Taxonomy & licenses

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 1730 (WI) Primary

PA · Physician Assistant: A licensed clinician who practices medicine in collaboration with physicians, trained in a graduate PA program. About the PA credential

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 Jeffrey Willis's NPI record?

Cross-check NPI 1558388520 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1558388520 active?

Yes, as of the latest NPPES snapshot, NPI 1558388520 is active (record last updated 2025-12-10).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-12-10.