Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Donald R. Welsh, Jr. D.M.D.,P.L.L.C

Dentist in Portsmouth, NH · enumerated 2008 · authorized official Donald Welsh, Dentist.

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

National Provider Identifier

1417135112

Verified

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Registry record

Entity type Organization (Type 2)

Legal business name Donald R. Welsh, Jr. D.M.D.,P.L.L.C

Practice address 320 Union St, Portsmouth, NH, 03801

Phone (603) 436-2144

Enumeration date Feb 5, 2008

Last updated in NPPES Feb 5, 2008

Taxonomy & classification

122300000X Dentist Dental Providers · License 2064 (NH) Primary

Authorized official

Name Donald Welsh

Title Dentist

Phone (603) 436-2144

Other identifiers

Identifier	Type	State	Issuer
30003323	Medicaid	NH	-

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

What is a Type 2 NPI?

A Type 2 NPI identifies an organization (group practice, hospital, pharmacy, lab), while Type 1 NPIs identify individual providers. Organizations bill under their Type 2 NPI.

What type of organization is Donald R. Welsh, Jr. D.M.D.,P.L.L.C?

Donald R. Welsh, Jr. D.M.D.,P.L.L.C is registered in NPPES as a Dentist (its primary provider taxonomy).

Providers at this address

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Donald Welsh General Practice Dentistry · Portsmouth, NH NPI 1407884679 Union Street Dental Pllc Prosthodontics · Portsmouth, NH NPI 1659806263

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-02-05.