Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Thomas C Pomierski DDS John S Sullivan DDS

General Practice Dentistry in Mundelein, IL · enumerated 2007 · authorized official Linda Walsh, Administrative.

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

National Provider Identifier

1548393598

Verified

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Registry record

Entity type Organization (Type 2)

Legal business name Thomas C Pomierski DDS John S Sullivan DDS

Other name <Unavail>

Practice address 328 N Lake Street, Mundelein, IL, 60060

Phone (847) 566-5560

Fax (847) 566-1311

Enumeration date Mar 13, 2007

Last updated in NPPES Aug 22, 2020

Taxonomy & classification

1223G0001X General Practice Dentistry Dental Providers Primary

Authorized official

Name Linda Walsh

Title Administrative

Phone (847) 566-5560

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 a Type 2 NPI?

A Type 2 NPI identifies an organization (group practice, hospital, pharmacy, lab), while Type 1 NPIs identify individual providers. Organizations bill under their Type 2 NPI.

What type of organization is Thomas C Pomierski DDS John S Sullivan DDS?

Thomas C Pomierski DDS John S Sullivan DDS is registered in NPPES as a General Practice Dentistry (its primary provider taxonomy).

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-08-22.