William M. Callahan, DDS, PC

William M. Callahan, DDS, PC is a healthcare organization registered as Dental Clinic/Center in Westminster, SC, holding Type 2 (organization) NPI 1346473683 since 2009. The authorized official on file is Debbie Smith, Office Manager.

✓ Active NPI ✓ Valid NPI checksum

NPI	1346473683
Entity type	Organization (Type 2)
Legal business name	William M. Callahan, DDS, PC
Practice address	104 W OAK HWY, Westminster, SC, 29693
Phone	8646479000
Fax	8646477873
Enumeration date	2009-09-03
Last updated in NPPES	2009-09-03

Authorized official

Name	Debbie Smith
Title	Office Manager
Phone	8646479000

Taxonomy & classification

Taxonomy code	Specialty	Primary	License	State
261QD0000X	Dental Clinic/Center	Primary	4167	SC

Copy-ready billing details

Provider: William M. Callahan, DDS, PC
NPI: 1346473683
Taxonomy: 261QD0000X (Dental Clinic/Center)
Address: 104 W OAK HWY, Westminster, SC, 29693

Providers at this address

NPI	Name	Type	Specialty	Location
1821140617	East End Dental Clinic, PC	Organization	General Practice Dentistry	Westminster, SC
1316493430	Raymond Trudeau	Individual	General Practice Dentistry	Westminster, SC
1235673740	Ambassador Practice Management, LLC	Organization	Dental Clinic/Center	Westminster, SC

Verify this record

Cross-check NPI 1346473683 against the authoritative CMS record: view William M. Callahan, DDS, PC on the official NPPES registry .

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 or validate an NPI number.

Frequently asked questions

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2009-09-03. Verify at npiregistry.cms.hhs.gov.

Where is William M. Callahan, DDS, PC located?

The practice location on file with NPPES is in Westminster, SC.

Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2009-09-03.