Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Geoffrey Robert Sinner, MD

Psychiatry Physician in Lebanon, NH · enumerated 2007.

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

National Provider Identifier

1851517585

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Registry record

Entity type Individual (Type 1)

Name Geoffrey Robert Sinner

Credential MD

Sex Male

Practice address Dartmouth-Hitchcock Medical Center, One Medical Center Drive, Lebanon, NH, 03756

Phone (603) 650-5748

Enumeration date Apr 18, 2007

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

2084P0800X Psychiatry Physician Allopathic & Osteopathic Physicians · License AMO443173-6356 (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

Where does Geoffrey Sinner practice?

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

What is the NPI number for Geoffrey Sinner?

The National Provider Identifier (NPI) for Geoffrey Sinner is 1851517585, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.