Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Gregory Mark Clifford, D.D.S.

Dentist in Piedmont, OK · enumerated 2014.

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

National Provider Identifier

1861806069

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Registry record

Entity type Individual (Type 1)

Name Dr. Gregory Mark Clifford

Credential D.D.S.

Sex Male

Practice address Piedmont, OK, 73078

Phone (405) 820-9457

Enumeration date Jun 16, 2014

Last updated in NPPES Mar 17, 2016

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

122300000X Dentist Dental Providers · License 6583 (OK) Primary

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.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does Gregory Clifford practice?

The practice location on file with NPPES is in Piedmont, OK. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Gregory Clifford?

The National Provider Identifier (NPI) for Gregory Clifford is 1861806069, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-03-17.