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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 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: August 16, 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.

TONYA M CONLEY MD
General Practice
8901 WISCONSIN AVENUE, WALTER REED NATIONAL MILITARY MEDICAL CENTER
BETHESDA, MD 20889
Montgomery County (301) 295-4600
ERIC SILVESTRE SUAREZ MD
Pathology (Anatomic Pathology)
8901 WISCONSIN AVENUE, PATHOLOGY DEPT., BUILDING 9
BETHESDA, MD 20889
Montgomery County (301) 319-8216
DR. BRADLEY A. SERWER M.D.
Internal Medicine (Interventional Cardiology)
8901 WISCONSIN AVENUE
BETHESDA, MD 20889
Montgomery County (301) 295-0390
DR. STEVEN HENRY MCILWAIN DPM
Podiatrist (Foot & Ankle Surgery)
8901 WISCONSIN AVENUE
BETHESDA, MD 20889
Montgomery County (301) 295-4295
DR. ROBERT MICHAEL TAFT
Dentist (Prosthodontics)
8901 WISCONSIN AVENUE, BLDG 1, RM 16125
BETHESDA, MD 20889
Montgomery County (301) 319-4509
DR. BRETT JAMES THEELER M.D.
Psychiatry & Neurology (Neurology)
8901 WISCONSIN AVENUE
BETHESDA, MD 20889
Montgomery County (301) 295-4771
DR. DALLIN ROWLEY M.D.
Student in an Organized Health Care Education/Training Program
8901 WISCONSIN AVENUE, WALTER REED NATIONAL MILITARY MEDICAL CENTER
BETHESDA, MD 20889
Montgomery County (301) 295-4503
DR. ALICE JEAN SITHOLE PHARM.D.
Pharmacist
8901 WISCONSIN AVENUE, OUTPATIENT PHARMACY
BETHESDA, MD 20889
Montgomery County (301) 295-2121

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 weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 42 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.