Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

William L. Downey Jr., M.D.

Pediatrics Physician in Las Vegas, NV · enumerated 2006.

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

National Provider Identifier

1477533867

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Registry record

Entity type Individual (Type 1)

Name William L. Downey Jr.

Credential M.D.

Sex Male

Practice address 10105 Banburry Cross Dr, Suite 370, Las Vegas, NV, 89144

Phone (702) 260-4525

Fax (702) 869-0133

Enumeration date Jan 20, 2006

Last updated in NPPES Sep 27, 2013

Taxonomy & licenses

208000000X Pediatrics Physician Allopathic & Osteopathic Physicians · License 5189 (NV) Primary

208000000X Pediatrics Physician Allopathic & Osteopathic Physicians · License MD00042163 (WA) Secondary

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
002002690	Medicaid	NV	-

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 William Downey practice?

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

What is the NPI number for William Downey?

The National Provider Identifier (NPI) for William Downey is 1477533867, 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 2013-09-27.