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

Christopher Onderdonk, LCSW

Clinical Social Worker in La Mesa, CA · enumerated 2010.

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

National Provider Identifier

1194028951

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Registry record

Entity type Individual (Type 1)

Name Christopher Onderdonk

Credential LCSW

Sex Male

Practice address La Mesa, CA, 91941

Phone (805) 448-8473

Enumeration date Dec 15, 2010

Last updated in NPPES Dec 15, 2010

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

Taxonomy & licenses

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License LCS24368 (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

Where does Christopher Onderdonk practice?

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

What is the NPI number for Christopher Onderdonk?

The National Provider Identifier (NPI) for Christopher Onderdonk is 1194028951, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-12-15.