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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. DIANE CATHERINE SIZGORICH D.D.S.
NPI 1821033689
Dentist - Pediatric Dentistry in San Pedro, CA

Active since June 17, 2006
1411 W 7TH ST, SUITE C, SAN PEDRO, CA 90732(310) 831-8861(310) 831-0010 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

About Dr. Diane Catherine Sizgorich D.d.s. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. DIANE CATHERINE SIZGORICH D.D.S. (NPI 1821033689) is an individual pediatric dentistry provider in San Pedro, California, licensed in California (42422) and active in the NPI registry since June 2006.

NPPES Registry Identity

NPI1821033689
Entity TypeIndividualFemale
Primary Taxonomy1223P0221X
Provider Legal NameDR. DIANE CATHERINE SIZGORICHCredential: D.D.S.
Location Address1411 W 7TH ST, SUITE CSan Pedro, CA 90732-3522
Mailing Address1411 W 7th St, Suite CSan Pedro, CA 90732-3522 · (310) 831-8861 · Fax (310) 831-0010
Phone(310) 831-8861
Fax(310) 831-0010
Sole ProprietorNo
Enumeration DateJune 17, 2006
Last NPPES UpdateJuly 13, 2026
✔ NPI 1821033689 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyDentist · Pediatric DentistryDental Providers
Taxonomy Code1223P0221X
License✔ Licensed in CA · 42422
Definition
An age-defined specialty that provides both primary and comprehensive preventive and therapeutic oral health care for infants and children through adolescence, including those with special health care needs.
1411 W 7TH ST, San Pedro, CA 90732
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Other Identifiers 1

Other975558CA · United Concordia

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Blue Cross and Blue Shield of Montana, Blue Cross and Blue Shield of Oklahoma, Blue Cross and Blue Shield of Texas and more.Insurance ›

Other Providers at the Same Location NPPES 2

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. JERRINE SUSAN SUMMER DDS
Dentist
1411 W 7TH ST, SUITE C
SAN PEDRO, CA 90732
Los Angeles County (310) 831-4516
DR. JACK NEELAN BURNS JR. D.C.
Chiropractor
1411 W 7TH ST, SUITE A
SAN PEDRO, CA 90732
Los Angeles County (310) 831-5550

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Diane Sizgorich's NPI number?

The NPI number for Diane Sizgorich is 1821033689. It was assigned to this individual provider in the NPPES registry on June 17, 2006.

Where is Diane Sizgorich located?

Diane Sizgorich practices at 1411 W 7th St Suite C, San Pedro, CA 90732. The listed phone number is (310) 831-8861.

What is Diane Sizgorich's specialty?

The primary specialty registered for this NPI is Dentist, specializing in Pediatric Dentistry, with taxonomy code 1223P0221X.

What insurance does Diane Sizgorich accept?

Health plans from Blue Cross and Blue Shield of Montana, Blue Cross and Blue Shield of Oklahoma, Blue Cross and Blue Shield of Texas, Florida Combined Life and Humana and 1 other insurer list Diane Sizgorich as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Diane Sizgorich was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 26 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.