Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Leonard H Mcwilliams DDS LLC

General Practice Dentistry in Deridder, LA · enumerated 2007 · authorized official Leonard Mcwilliams, Principal Officer.

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

National Provider Identifier

1598887572

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Registry record

Entity type Organization (Type 2)

Legal business name Leonard H Mcwilliams DDS LLC

Practice address 501 Bon Ami St, Deridder, LA, 70634

Phone (337) 462-1315

Fax (337) 462-6411

Enumeration date Apr 3, 2007

Last updated in NPPES Aug 22, 2020

Taxonomy & classification

1223G0001X General Practice Dentistry Dental Providers · License 3362 (LA) Primary

Authorized official

Name Leonard Mcwilliams

Title Principal Officer

Phone (337) 462-1315

Other identifiers

Identifier	Type	State	Issuer
1833622	Medicaid	LA	-

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 is Leonard H Mcwilliams DDS LLC located?

The practice location on file with NPPES is in Deridder, LA.

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2020-08-22. Verify at npiregistry.cms.hhs.gov.

Providers at this address

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Leonard Mcwilliams General Practice Dentistry · Deridder, LA NPI 1609988799 Jennifer Cooley Family Nurse Practitioner · Deridder, LA NPI 1982185799

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-08-22.