NPI Portal NPI Lookup & Verification

Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Melissa S Kostial-Janos P.C.

Adult Mental Health Clinic/Center in Gurnee, IL · enumerated 2015 · authorized official Melissa Kostial-Janos, President/ Owner.

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

National Provider Identifier

1932577376

Verified

See something wrong? Report a correction

Registry record

Entity type Organization (Type 2)
Legal business name Melissa S Kostial-Janos P.C.
Other name <Unavail>
Practice address 135 N Greenleaf St, Ste 228, Gurnee, IL, 60031
Phone (224) 603-1199
Enumeration date Sep 2, 2015
Last updated in NPPES Sep 2, 2015

Taxonomy & classification

261QM0850X Adult Mental Health Clinic/Center Ambulatory Health Care Facilities · License 149001506 (IL) Primary

Authorized official

Name Melissa Kostial-Janos
Title President/ Owner
Phone (224) 603-1199

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 Melissa S Kostial-Janos P.C.?
Melissa S Kostial-Janos P.C. is registered in NPPES as a Adult Mental Health Clinic/Center (its primary provider taxonomy).

Providers at this address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-09-02.