Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Emmet Michael Cassidy, MD

Ophthalmology Physician in Homewood, IL · enumerated 2006 · practices at Mission Optical, Inc..

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

National Provider Identifier

1770544462

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Registry record

Entity type Individual (Type 1)

Name Dr. Emmet Michael Cassidy

Credential MD

Sex Male

Practice address 18646 Dixie Hwy, Homewood, IL, 60430

Phone (708) 647-6635

Fax (708) 647-6649

Enumeration date Mar 31, 2006

Last updated in NPPES Feb 1, 2011

Taxonomy & licenses

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License 036092971 (IL) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
01620861	Other	IL	BLUE CROSS AND BLUE SHIELD
205785	Other	IL	PTAN IL MEDICARE COOK COUNTY
036092971	Medicaid	IL	-
180046212	Other	IL	MEDICARE RAILROAD
1083684922	Other	IL	THE ESC GROUP NPI
P00379235	Other	IL	MEDICARE RAILROAD

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 Emmet Cassidy?

The National Provider Identifier (NPI) for Emmet Cassidy is 1770544462, a Type 1 (individual) record in the CMS NPPES registry.

Where does Emmet Cassidy practice?

The practice location on file with NPPES is in Homewood, IL. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

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Mission Optical, Inc. Ophthalmology Physician · Homewood, IL NPI 1538246996

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-02-01.