Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Gregory S Neilley, MD

Internal Medicine Physician in Peterborough, NH · enumerated 2006.

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

National Provider Identifier

1336117852

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Registry record

Entity type Individual (Type 1)

Name Gregory S Neilley

Credential MD

Sex Male

Practice address 454 Old Street Rd, Suite 301, Peterborough, NH, 03458

Phone (603) 924-4680

Fax (603) 924-4977

Enumeration date Mar 9, 2006

Last updated in NPPES Nov 9, 2015

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 8060 (NH) Primary

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

Other identifiers

Identifier	Type	State	Issuer
30002991	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 the NPI number for Gregory Neilley?

The National Provider Identifier (NPI) for Gregory Neilley is 1336117852, a Type 1 (individual) record in the CMS NPPES registry.

Where does Gregory Neilley practice?

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

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-11-09.