Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum Organization subpart

Onsite Health Ancillary Services

Internal Medicine Physician in Lincolnwood, IL · enumerated 2013 · authorized official Issam Maatouk, President.

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

National Provider Identifier

1497188692

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Registry record

Entity type Organization (Type 2)

Legal business name Onsite Health Ancillary Services

Parent organization Onsite Healthcare, Inc., Sc

Practice address 7301 N Lincoln Ave, Suite 183, Lincolnwood, IL, 60712

Phone (708) 937-8125

Fax (847) 674-0892

Enumeration date Aug 12, 2013

Last updated in NPPES Aug 12, 2013

Taxonomy & classification

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians Secondary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians Primary

207RG0300X Geriatric Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians Secondary

208VP0000X Pain Medicine Physician Allopathic & Osteopathic Physicians Secondary

Authorized official

Name Issam Maatouk

Title President

Phone (847) 810-9095

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

Where is Onsite Health Ancillary Services located?

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

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2013-08-12. Verify at npiregistry.cms.hhs.gov.

Providers at this address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-08-12.