Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Jenelle L Mallios Gialousakis, O.D.

Optometrist in Downers Grove, IL · enumerated 2010.

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

National Provider Identifier

1700190535

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Registry record

Entity type Individual (Type 1)

Name Jenelle L Mallios Gialousakis

Credential O.D.

Sex Female

Practice address 3450 Lacey Rd, Downers Grove, IL, 60515

Phone (630) 743-4500

Fax (630) 743-4537

Enumeration date Aug 4, 2010

Last updated in NPPES Nov 16, 2018

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License 046011190 (IL) Primary

OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses. About the OD credential

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

Is NPI 1700190535 active?

Yes, as of the latest NPPES snapshot, NPI 1700190535 is active (record last updated 2018-11-16).

How do I verify Jenelle Mallios Gialousakis's NPI record?

Cross-check NPI 1700190535 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-11-16.