Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Douglas Williamson, MD

Pediatrics Physician in Lebanon, NH · enumerated 2005 · practices at Alice Peck Day Memorial Hospital.

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

National Provider Identifier

1265428221

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Registry record

Entity type Individual (Type 1)

Name Douglas Williamson

Credential MD

Sex Male

Practice address 5 Alice Peck Day Dr, Lebanon, NH, 03766

Phone (603) 448-3122

Fax (603) 448-7491

Enumeration date Sep 26, 2005

Last updated in NPPES Apr 8, 2013

Taxonomy & licenses

208000000X Pediatrics Physician Allopathic & Osteopathic Physicians · License 9573 (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
26P017	Other	NH	MVP
30009508	Medicaid	NH	-
0104124YPNH01	Other	NH	ANTHEM
G27109	Other	NH	HARVARD PILGRIM
00028912	Other	VT	BC BS VT

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.

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Frequently asked questions

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.

What specialty is Douglas Williamson?

Douglas Williamson 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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-04-08.