Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Christina Marie Holst Tyhurst, LCSW

Clinical Social Worker in Fairfield, CA · enumerated 2007.

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

National Provider Identifier

1821297904

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Registry record

Entity type Individual (Type 1)

Name Christina Marie Holst Tyhurst

Credential LCSW

Sex Female

Practice address 5184 Julia Berger Cir, Fairfield, CA, 94534

Phone (650) 224-2113

Enumeration date Jul 17, 2007

Last updated in NPPES Dec 12, 2024

Taxonomy & licenses

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 115112 (CA) Primary

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

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

How do I verify Christina Tyhurst's NPI record?

Cross-check NPI 1821297904 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1821297904 active?

Yes, as of the latest NPPES snapshot, NPI 1821297904 is active (record last updated 2024-12-12).

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-12-12.