Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

John Diune, D.D.S.

Endodontics in Nashua, NH · enumerated 2008 · authorized official John Diune, Dentist Owner.

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

National Provider Identifier

1821266776

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Registry record

Entity type Organization (Type 2)

Legal business name John Diune, D.D.S.

Practice address 451 Amherst St, Suite 104, Nashua, NH, 03063

Phone (603) 883-3777

Fax (603) 883-3778

Enumeration date Feb 13, 2008

Last updated in NPPES Feb 13, 2008

Taxonomy & classification

1223E0200X Endodontics Dental Providers · License 3437 (NH) Primary

Authorized official

Name John Diune

Title Dentist Owner

Phone (603) 883-3777

Other identifiers

Identifier	Type	State	Issuer
30304600	Medicaid	NH	-
0215112	Medicaid	MA	-

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 is John Diune, D.D.S. located?

The practice location on file with NPPES is in Nashua, NH.

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2008-02-13. Verify at npiregistry.cms.hhs.gov.

Providers at this address

Browse all →

Thomas F Scadova Pllc Optometrist · Nashua, NH NPI 1235169475 Richard Robillard Optometrist · Nashua, NH NPI 1891727632 Thomas Scadova Optometrist · Nashua, NH NPI 1356459846 John Diune Endodontics · Nashua, NH NPI 1285731869 Gerald Astorino Optometrist · Nashua, NH NPI 1154497691

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-02-13.