Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Karen Grante Bonnanzio, O.D.

Optometrist in Stratford, CT · enumerated 2006.

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

National Provider Identifier

1508955873

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Registry record

Entity type Individual (Type 1)

Name Karen Grante Bonnanzio

Credential O.D.

Sex Female

Practice address 7365 Main St, Stratford, CT, 06614

Phone (203) 377-3937

Fax (888) 741-0620

Enumeration date Oct 12, 2006

Last updated in NPPES Oct 13, 2016

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License 002346 (CT) Primary

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

Other identifiers

Identifier	Type	State	Issuer
004160983	Medicaid	CT	-
020346	Other	CT	CONNECTICARE
50ORONOQUCT01	Other	CT	ANTHEM
1040121	Other	CT	WELLCARE
115529	Other	CT	EYEMED
0297743	Other	CT	AETNA
1801834247	Other	CT	OXFORD
204142248	Other	CT	CIGNA

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

Where does Karen Bonnanzio practice?

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

What is the NPI number for Karen Bonnanzio?

The National Provider Identifier (NPI) for Karen Bonnanzio is 1508955873, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-10-13.