Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William D Gay, DDS

Oral & Maxillofacial Surgery (D.M.D.) in Saint Louis, MO · enumerated 2006 · practices at Mohamed Elsafi, DDS LLC.

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

National Provider Identifier

1063435089

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Registry record

Entity type Individual (Type 1)

Name Dr. William D Gay

Credential DDS

Sex Male

Practice address 517 S Euclid Ave, 8th Floor, Saint Louis, MO, 63110

Phone (314) 362-8574

Fax (314) 747-4635

Enumeration date Jul 25, 2006

Last updated in NPPES Jul 17, 2009

Taxonomy & licenses

204E00000X Oral & Maxillofacial Surgery (D.M.D.) Allopathic & Osteopathic Physicians · License 013212 (MO) Primary

DDS · Doctor of Dental Surgery: A licensed dentist; DDS and DMD are equivalent dental degrees. About the DDS credential

Other identifiers

Identifier	Type	State	Issuer
400971404	Medicaid	MO	-

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

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is William Gay?

William Gay is registered in NPPES with the primary taxonomy of Oral & Maxillofacial Surgery (D.M.D.). The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-07-17.