Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Patrick Duff, MD

Pediatrics Physician in Nashua, NH · enumerated 2018.

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

National Provider Identifier

1659876332

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Registry record

Entity type Individual (Type 1)

Name Patrick Duff

Credential MD

Sex Male

Practice address 116 Spit Brook Rd, Nashua, NH, 03062

Phone (603) 891-0083

Fax (603) 891-6940

Enumeration date Mar 26, 2018

Last updated in NPPES Aug 12, 2022

Taxonomy & licenses

208000000X Pediatrics Physician Allopathic & Osteopathic Physicians · License 042.0015364 (VT) Secondary

390200000X Student in an Organized Health Care Education/Training Program Student, Health Care Secondary

208000000X Pediatrics Physician Allopathic & Osteopathic Physicians · License 22957 (NH) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD 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

What specialty is Patrick Duff?

Patrick Duff is registered in NPPES with the primary taxonomy of Pediatrics Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-08-12.