Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

David Tierney, OD

Optometrist in Somerville, MA · enumerated 2006.

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

National Provider Identifier

1265597439

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Registry record

Entity type Individual (Type 1)

Name David Tierney

Credential OD

Sex Male

Practice address 40 Holland St, Somerville, MA, 02144

Phone (617) 629-6280

Fax (617) 629-6275

Enumeration date Dec 27, 2006

Last updated in NPPES Jun 8, 2011

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License 3316 (MA) 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
0014536	Other	MA	NHP
0300110	Medicaid	MD	-
E178	Other	MA	HPHC
W15896	Other	MA	BCBS
1954814-001	Other	MA	CIGNA
003316	Other	MA	TUFTS

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

Is NPI 1265597439 active?

Yes, as of the latest NPPES snapshot, NPI 1265597439 is active (record last updated 2011-06-08).

How do I verify David Tierney's NPI record?

Cross-check NPI 1265597439 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-06-08.