Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Cornelia Verna Mathilde Seiffert, LCSW

Clinical Social Worker in Orange, CA · enumerated 2018.

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

National Provider Identifier

1821576828

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Registry record

Entity type Individual (Type 1)

Name Cornelia Verna Mathilde Seiffert

Credential LCSW

Sex Female

Practice address 1820 W Orangewood Ave Ste 105, Orange, CA, 92868

Phone (323) 886-2417

Fax (626) 565-1565

Enumeration date Aug 1, 2018

Last updated in NPPES Jun 2, 2022

Taxonomy & licenses

101YM0800X Mental Health Counselor Behavioral Health & Social Service Providers Secondary

101YM0800X Mental Health Counselor Behavioral Health & Social Service Providers · License 81461 (CA) Secondary

104100000X Social Worker Behavioral Health & Social Service Providers · License 81461 (CA) Secondary

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 104102 (CA) Primary

LCSW · Licensed Clinical Social Worker: A social worker licensed for clinical practice including mental-health therapy. About the LCSW 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 Cornelia Seiffert?

The National Provider Identifier (NPI) for Cornelia Seiffert is 1821576828, a Type 1 (individual) record in the CMS NPPES registry.

Where does Cornelia Seiffert practice?

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

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-06-02.