Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

William R Leahy, M.D.

Neurology with Special Qualifications in Child Neurology Physician in Greenbelt, MD · enumerated 2006.

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

National Provider Identifier

1164439550

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Registry record

Entity type Individual (Type 1)

Name William R Leahy

Credential M.D.

Sex Male

Practice address 7500 Hanover Pkwy, Suite 201, Greenbelt, MD, 20770

Phone (301) 982-7944

Fax (301) 441-8696

Enumeration date Aug 1, 2006

Last updated in NPPES Oct 11, 2022

Taxonomy & licenses

2084N0400X Neurology Physician Allopathic & Osteopathic Physicians · License D15593 (MD) Secondary

2084N0402X Neurology with Special Qualifications in Child Neurology Physician Allopathic & Osteopathic Physicians · License D0015593 (MD) 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
16540004	Other	MD	BCBS DC
23041	Other	MD	MAMSI
310511300	Medicaid	MD	-
32958002	Other	MD	BCBS MD
0500456	Other	MD	UNITED HEALTHCARE
528559	Other	MD	AETNA USHC

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

How do I verify William Leahy's NPI record?

Cross-check NPI 1164439550 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1164439550 active?

Yes, as of the latest NPPES snapshot, NPI 1164439550 is active (record last updated 2022-10-11).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-10-11.