Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Gregory Thomas Marshall, M.D.

Surgery Physician in Farmington, ME · enumerated 2006 · practices at Mainehealth.

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

National Provider Identifier

1225134174

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Registry record

Entity type Individual (Type 1)

Name Dr. Gregory Thomas Marshall

Credential M.D.

Sex Male

Practice address 181 Franklin Health Commons, Farmington, ME, 04938

Phone (207) 778-6579

Fax (207) 778-6409

Enumeration date Sep 16, 2006

Last updated in NPPES Jan 5, 2012

Taxonomy & licenses

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License 013945 (ME) 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 is the NPI number for Gregory Marshall?

The National Provider Identifier (NPI) for Gregory Marshall is 1225134174, a Type 1 (individual) record in the CMS NPPES registry.

Where does Gregory Marshall practice?

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

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-01-05.