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

Mrs. Elizabeth Indiana Siliezar

Peer Specialist in Antioch, CA · enumerated 2007.

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

National Provider Identifier

1023297900

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Registry record

Entity type Individual (Type 1)

Name Mrs. Elizabeth Indiana Siliezar

Sex Female

Practice address Antioch, CA, 94509

Phone (925) 608-8700

Fax (925) 608-8715

Enumeration date Oct 29, 2007

Last updated in NPPES Sep 29, 2023

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

Taxonomy & licenses

175T00000X Peer Specialist Other Service Providers Primary

172V00000X Community Health Worker Other Service Providers Secondary

Other identifiers

Identifier	Type	State	Issuer
101YM0800X	Medicaid	CA	-

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 Elizabeth Siliezar?

The National Provider Identifier (NPI) for Elizabeth Siliezar is 1023297900, a Type 1 (individual) record in the CMS NPPES registry.

Where does Elizabeth Siliezar practice?

The practice location on file with NPPES is in Antioch, 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 2023-09-29.