Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Theresa Karyn Cassidy, OD

Optometrist in Memphis, TN · enumerated 2018.

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

National Provider Identifier

1124511266

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Registry record

Entity type Individual (Type 1)

Name Dr. Theresa Karyn Cassidy

Credential OD

Sex Female

Practice address 1689 Nonconnah Blvd, Memphis, TN, 38132

Phone (901) 523-8990

Enumeration date Jun 13, 2018

Last updated in NPPES Dec 30, 2019

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License 3470 (TN) 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

What specialty is Theresa Cassidy?

Theresa Cassidy is registered in NPPES with the primary taxonomy of Optometrist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-12-30.