Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Alyssa Flanagan Keyser, OD

Optometrist in Hampton Bays, NY · enumerated 2019 · practices at Legacy Optical Inc.

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

National Provider Identifier

1427618123

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Registry record

Entity type Individual (Type 1)

Name Alyssa Flanagan Keyser

Credential OD

Sex Female

Practice address 4 Springville Rd Ste A, Hampton Bays, NY, 11946

Phone (631) 728-3132

Fax (316) 728-0976

Enumeration date Jun 17, 2019

Last updated in NPPES Jun 15, 2021

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License 988 (NH) 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

Where does Alyssa Keyser practice?

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

What is the NPI number for Alyssa Keyser?

The National Provider Identifier (NPI) for Alyssa Keyser is 1427618123, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Lisa Pfleger Optician · Hampton Bays, NY NPI 1801359146 Legacy Optical Inc Optician · Hampton Bays, NY NPI 1114515467

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-06-15.