Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Edward Lloyd Williamson, M.D.

Neurology Physician in Greensburg, PA · enumerated 2005.

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

National Provider Identifier

1669473492

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Registry record

Entity type Individual (Type 1)

Name Edward Lloyd Williamson

Credential M.D.

Sex Male

Practice address 426 Pellis Rd, Greensburg, PA, 15601

Phone (724) 838-0090

Fax (724) 838-7717

Enumeration date Aug 2, 2005

Last updated in NPPES Nov 16, 2010

Taxonomy & licenses

2084N0400X Neurology Physician Allopathic & Osteopathic Physicians · License MD014362E (PA) 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
0627455	Medicaid	PA	-
80330	Other	PA	U.S.HEALTHCARE
0006513	Other	PA	U.M.W.

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 Edward Williamson?

The National Provider Identifier (NPI) for Edward Williamson is 1669473492, a Type 1 (individual) record in the CMS NPPES registry.

Where does Edward Williamson practice?

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

Other providers at this practice address

Browse all →

Bharat Jain Internal Medicine Physician · Greensburg, PA NPI 1366448508 Karuna Mandava Neurology Physician · Greensburg, PA NPI 1255305397 Edward L Williamson, M.D.,P.C. Neurology Physician · Greensburg, PA NPI 1629191531 Southwest PA Neurology, LLC Neurology Physician · Greensburg, PA NPI 1851574644 Westmoreland Sleep Medicine Durable Medical Equipment & Medical Supplies · Greensburg, PA NPI 1316278237 Westmoreland Sleep Medicine, P.C. Sleep Medicine (Internal Medicine) Physician · Greensburg, PA NPI 1780990770 Westmoreland Sleep Medicine-Dme, Inc. Durable Medical Equipment & Medical Supplies · Greensburg, PA NPI 1992011969

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-11-16.