Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

John Tomashek, M.D.

Vascular & Interventional Radiology Physician in Mequon, WI · enumerated 2005.

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

National Provider Identifier

1013999564

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name John Tomashek

Credential M.D.

Sex Male

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

Phone (262) 292-3151

Enumeration date Nov 18, 2005

Last updated in NPPES Sep 11, 2024

Taxonomy & licenses

2085R0202X Diagnostic Radiology Physician Allopathic & Osteopathic Physicians · License 44063 (WI) Secondary

2085R0204X Vascular & Interventional Radiology Physician Allopathic & Osteopathic Physicians · License 44063 (WI) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD 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

What is the NPI number for John Tomashek?

The National Provider Identifier (NPI) for John Tomashek is 1013999564, a Type 1 (individual) record in the CMS NPPES registry.

Where does John Tomashek practice?

The practice location on file with NPPES is in Mequon, WI. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-09-11.