Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. John D Tassinari, O.D

Optometrist in Pomona, CA · enumerated 2006.

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

National Provider Identifier

1689770489

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Registry record

Entity type Individual (Type 1)

Name Dr. John D Tassinari

Credential O.D

Sex Male

Practice address 795 E 2nd St, Suite 2, Pomona, CA, 91766

Phone (909) 706-3899

Fax (909) 469-8640

Enumeration date Sep 16, 2006

Last updated in NPPES Oct 27, 2016

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License OPT8873TPG (CA) Primary

152WP0200X Pediatric Optometrist Eye and Vision Services Providers · License OPT8873TPG (CA) Secondary

152WV0400X Vision Therapy Optometrist Eye and Vision Services Providers · License OPT8873TPG (CA) Secondary

OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses. About the OD 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

Where does John Tassinari practice?

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

What is the NPI number for John Tassinari?

The National Provider Identifier (NPI) for John Tassinari is 1689770489, 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 2016-10-27.