Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. William Lee O'Neill, D.D.S.
Pediatric Dentistry in Desoto, TX · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1356380547
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Registry record
Entity type Individual (Type 1)
Name Dr. William Lee O'Neill
Credential D.D.S.
Sex Male
Practice address 2611 Bolton Boone Dr, Desoto, TX, 75115
Phone (972) 296-9976
Fax (976) 296-2280
Enumeration date Jun 5, 2006
Last updated in NPPES Jul 8, 2007
Taxonomy & licenses
DDS · Doctor of Dental Surgery: A licensed dentist; DDS and DMD are equivalent dental degrees.
About the DDS credential
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.
Frequently asked questions
Is NPI 1356380547 active?
Yes, as of the latest NPPES snapshot, NPI 1356380547 is active (record last updated 2007-07-08).
How do I verify William O'Neill's NPI record?
Cross-check NPI 1356380547 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.