Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Mark J Friedman MD

Psychiatry Physician in Glenview, IL · enumerated 2016 · authorized official Roman Hnatiw, Acct Manager.

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

National Provider Identifier

1932652377

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Registry record

Entity type Organization (Type 2)

Legal business name Mark J Friedman MD

Practice address 400 Wilmette Ave, Glenview, IL, 60025

Phone (630) 241-1495

Fax (630) 241-1543

Enumeration date Aug 3, 2016

Last updated in NPPES Aug 3, 2016

Taxonomy & classification

2084P0800X Psychiatry Physician Allopathic & Osteopathic Physicians · License 036103961 (IL) Primary

Authorized official

Name Roman Hnatiw

Title Acct Manager

Phone (630) 241-1495

Other identifiers

Identifier	Type	State	Issuer
036103961	Medicaid	IL	-

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 current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2016-08-03. Verify at npiregistry.cms.hhs.gov.

Where is Mark J Friedman MD located?

The practice location on file with NPPES is in Glenview, IL.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-08-03.