Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William Gregory Gensheimer, M.D.

Ophthalmology Physician in Lebanon, NH · enumerated 2010 · practices at Dartmouth Hitchcock Psychiatric Associates.

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

National Provider Identifier

1275858656

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Registry record

Entity type Individual (Type 1)

Name Dr. William Gregory Gensheimer

Credential M.D.

Sex Male

Practice address 1 Medical Center Drive, Lebanon, NH, 03756

Phone (603) 650-5123

Enumeration date Mar 29, 2010

Last updated in NPPES Sep 14, 2021

Taxonomy & licenses

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License DR.0053423 (CO) Secondary

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

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License 21873 (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 William Gensheimer?

William Gensheimer is registered in NPPES with the primary taxonomy of Ophthalmology 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 2021-09-14.