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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 30 days.

DR. WILLIAM JOSEPH LEONARD DDS
NPI 1710948310
Dentist - General Practice in Bethesda, MD

Active since March 31, 2006
8901 WISCONSIN AVENUE, BETHESDA, MD 20889(301) 319-4794 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: July 19, 2026.

About Dr. William Joseph Leonard Dds NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. WILLIAM JOSEPH LEONARD DDS (NPI 1710948310) is an individual general practice provider in Bethesda, Maryland, licensed in Texas (12588) and active in the NPI registry since March 2006.

NPPES Registry Identity

NPI1710948310
Entity TypeIndividualMale
Primary Taxonomy1223G0001X
Provider Legal NameDR. WILLIAM JOSEPH LEONARDCredential: DDS
Location Address8901 WISCONSIN AVENUEBethesda, MD 20889-5600
Mailing Address22 Hayek StBeaufort, SC 29907-2068 · (843) 525-6358
Phone(301) 319-4794
Sole ProprietorNo
Enumeration DateMarch 31, 2006
Last NPPES UpdateJuly 13, 2026
✔ NPI 1710948310 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyDentist · General PracticeDental Providers
Taxonomy Code1223G0001X
License✔ Licensed in TX · 12588
Definition

A general dentist is the primary dental care provider for patients of all ages. The general dentist is responsible for the diagnosis, treatment, management and overall coordination of services related to patients' oral health needs.

8901 WISCONSIN AVENUE, Bethesda, MD 20889
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Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. DANIEL RICARDO ELIZONDO M.D.
Ophthalmology
8901 WISCONSIN AVENUE
BETHESDA, MD 20889
Montgomery County (301) 295-1339
DR. MARIA TERESA MAGONE DE QUADROS COSTA M.D.
Ophthalmology
8901 WISCONSIN AVENUE
BETHESDA, MD 20889
Montgomery County (301) 295-1339
DR. DAVID B MCLEAN M.D.
Family Medicine
8901 WISCONSIN AVENUE
BETHESDA, MD 20889
Montgomery County (301) 295-0196
DR. HYEJIN ESTHER CHO DMD
Dentist (General Practice)
8901 WISCONSIN AVENUE, NATIONAL NAVAL MEDICAL CENTER
BETHESDA, MD 20889
Montgomery County (301) 319-4793
DR. THOMAS GEORGE FRIEDRICH M.D.
Emergency Medicine
8901 WISCONSIN AVENUE
BETHESDA, MD 20889
Montgomery County (301) 319-5009
DR. ANGELINE ABRAHAM LAZARUS MD
Internal Medicine (Pulmonary Disease)
8901 WISCONSIN AVENUE, NATIONAL NAVAL MEDICAL CENTER
BETHESDA, MD 20889
Montgomery County (301) 295-4218
MS. CAROL GUZEWICZ PETRIE P.T.
Physical Therapist
8901 WISCONSIN AVENUE
BETHESDA, MD 20889
Montgomery County (301) 295-2883
DR. MARY PURUCKER M.D., PH.D.
Internal Medicine (Pulmonary Disease)
8901 WISCONSIN AVENUE
BETHESDA, MD 20889
Montgomery County (301) 295-4191

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is William Leonard's NPI number?

The NPI number for William Leonard is 1710948310. It was assigned to this individual provider in the NPPES registry on March 31, 2006.

Where is William Leonard located?

William Leonard practices at 8901 Wisconsin Avenue, Bethesda, MD 20889. The listed phone number is (301) 319-4794.

What is William Leonard's specialty?

The primary specialty registered for this NPI is Dentist, specializing in General Practice, with taxonomy code 1223G0001X.

When was this NPI record last updated?

The NPPES record for William Leonard was last updated on July 13, 2026. NPI Profile syncs with the weekly NPPES data releases published by CMS.