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Drs. Leahy & Disalvo-Ost, P.C.

Optometrist in Oak Lawn, IL · enumerated 2007 · authorized official Margaret Pawelski, Manager.

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

National Provider Identifier

1093851487

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Registry record

Entity type Organization (Type 2)
Legal business name Drs. Leahy & Disalvo-Ost, P.C.
Practice address 4445 W 95th St, Oak Lawn, IL, 60453
Phone (708) 425-6500
Fax (708) 425-1455
Enumeration date Jan 30, 2007
Last updated in NPPES Aug 17, 2018

Taxonomy & classification

152W00000X Optometrist Eye and Vision Services Providers · License 060.003768 (IL) Primary

Authorized official

Name Margaret Pawelski
Title Manager
Phone (708) 425-6500

Other identifiers

Identifier Type State Issuer
CN3870 Other IL RR MEDICARE

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.

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Frequently asked questions

What type of organization is Drs. Leahy & Disalvo-Ost, P.C.?
Drs. Leahy & Disalvo-Ost, P.C. is registered in NPPES as a Optometrist (its primary provider taxonomy).
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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-08-17.