Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Leon B Bastajian, DDS

Dentist in Watertown, MA · enumerated 2005.

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

National Provider Identifier

1639155831

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Registry record

Entity type Individual (Type 1)

Name Leon B Bastajian

Credential DDS

Sex Male

Practice address 521 Mount Auburn St, Ste 207, Watertown, MA, 02472

Phone (617) 926-1146

Enumeration date Dec 20, 2005

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

122300000X Dentist Dental Providers · License 14467 (MA) Primary

DDS · Doctor of Dental Surgery: A licensed dentist; DDS and DMD are equivalent dental degrees. About the DDS 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 Leon Bastajian practice?

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

What is the NPI number for Leon Bastajian?

The National Provider Identifier (NPI) for Leon Bastajian is 1639155831, 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 2007-07-08.