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

Dr. John P Diponziano, DDS

Dentist in San Leandro, CA · enumerated 2005.

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

National Provider Identifier

1770569600

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Registry record

Entity type Individual (Type 1)

Name Dr. John P Diponziano

Credential DDS

Sex Male

Practice address San Leandro, CA, 94577

Phone (510) 569-0218

Fax (510) 569-9714

Enumeration date Dec 22, 2005

Last updated in NPPES Apr 18, 2011

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

Taxonomy & licenses

122300000X Dentist Dental Providers · License 55315 (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.

Read the full guide → Validate an NPI →

Frequently asked questions

What is the NPI number for John Diponziano?

The National Provider Identifier (NPI) for John Diponziano is 1770569600, a Type 1 (individual) record in the CMS NPPES registry.

Where does John Diponziano practice?

The practice location on file with NPPES is in San Leandro, 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 2011-04-18.