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

Mr. Clarence Spencer Tang, DDS, MD

Oral and Maxillofacial Surgery (Dentist) in Poway, CA · enumerated 2007 · practices at Ellen Im DDS Inc.

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

National Provider Identifier

1790987972

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Registry record

Entity type Individual (Type 1)
Name Mr. Clarence Spencer Tang
Credential DDS, MD
Sex Male
Practice address Poway, CA, 92064
Phone (847) 769-5381
Enumeration date Jun 1, 2007
Last updated in NPPES Nov 30, 2023

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

Taxonomy & licenses

1223S0112X Oral and Maxillofacial Surgery (Dentist) Dental Providers · License 109682 (CA) Primary
1223S0112X Oral and Maxillofacial Surgery (Dentist) Dental Providers · License 019.030300 (IL) Secondary
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

What is the NPI number for Clarence Tang?
The National Provider Identifier (NPI) for Clarence Tang is 1790987972, a Type 1 (individual) record in the CMS NPPES registry.
Where does Clarence Tang practice?
The practice location on file with NPPES is in Poway, CA. Providers can have multiple locations; NPPES lists the primary practice address.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-11-30.