Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Alexander Martin, OD

Optometrist in Brookline, MA · enumerated 2017.

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

National Provider Identifier

1851816201

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Registry record

Entity type Individual (Type 1)

Name Dr. Alexander Martin

Credential OD

Sex Male

Practice address 24 Webster Pl, Brookline, MA, 02445

Phone (617) 202-2020

Fax (617) 734-3264

Enumeration date Aug 7, 2017

Last updated in NPPES Sep 23, 2026

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License 5272 (MA) Primary

152W00000X Optometrist Eye and Vision Services Providers · License 0979 (NH) Secondary

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 Alexander Martin practice?

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

What is the NPI number for Alexander Martin?

The National Provider Identifier (NPI) for Alexander Martin is 1851816201, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-09-23.