Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Medical Associates of Illinois Sc

Q: What is the NPI number for Medical Associates of Illinois Sc?

The NPI for Medical Associates of Illinois Sc is 1164868618, a Type 2 (organization) record in the CMS NPPES registry.

Internal Medicine Physician in Elmwood Park, IL · enumerated 2013 · authorized official Frederick Tiesenga, President.

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

National Provider Identifier

1164868618

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Registry record

Entity type Organization (Type 2)

Legal business name Medical Associates of Illinois Sc

Practice address 1950 N Harlem Ave, Elmwood Park, IL, 60707

Phone (708) 452-2800

Fax (708) 452-7515

Enumeration date May 10, 2013

Last updated in NPPES Feb 6, 2014

Taxonomy & classification

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians Primary

Authorized official

Name Frederick Tiesenga

Title President

Phone (708) 452-2800

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 Medical Associates of Illinois Sc?

The NPI for Medical Associates of Illinois Sc is 1164868618, a Type 2 (organization) record in the CMS NPPES registry.

Who is the authorized official for Medical Associates of Illinois Sc?

NPPES lists Frederick Tiesenga (President) as the authorized official for this organization.

Providers at this address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-02-06.