Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Donald S. Clem III, D.D.S.

Periodontics in Fullerton, CA · enumerated 2006.

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

National Provider Identifier

1770673287

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Registry record

Entity type Individual (Type 1)

Name Dr. Donald S. Clem III

Credential D.D.S.

Sex Male

Practice address 220 Laguna Rd, Suite 3, Fullerton, CA, 92835

Phone (714) 441-0436

Fax (714) 441-0439

Enumeration date Oct 13, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

1223P0300X Periodontics Dental Providers · License 29240 (CA) 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.

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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 Donald Clem?

Donald Clem is registered in NPPES with the primary taxonomy of Periodontics. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Other providers at this practice address

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Donald Tormey General Practice Dentistry · Fullerton, CA NPI 1922027903 Nelson T. Yen DDS, Ms Inc. Periodontics · Fullerton, CA NPI 1538254396 Louis Mcnabb Pulmonary Disease Physician · Fullerton, CA NPI 1346329323 James Hardeman Pulmonary Disease Physician · Fullerton, CA NPI 1043399017 Panagiotis Bougas Internal Medicine Physician · Fullerton, CA NPI 1295814275 North Orange County Pediatrics Chiles Dan W Et Al Gen Ptrs Pediatric Adolescent Medicine Physician · Fullerton, CA NPI 1356525182 Sarah Dejesus Nurse Practitioner · Fullerton, CA NPI 1689063273

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.