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

Duane Robert Westhoff, MSW

Social Worker in Menlo Park, CA · enumerated 2010.

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

National Provider Identifier

1194049320

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Registry record

Entity type Individual (Type 1)

Name Duane Robert Westhoff

Credential MSW

Sex Male

Practice address Menlo Park, CA, 94025

Phone (650) 493-5000

Fax (650) 617-2619

Enumeration date Mar 17, 2010

Last updated in NPPES Feb 19, 2018

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

Taxonomy & licenses

104100000X Social Worker Behavioral Health & Social Service Providers Primary

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.

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Frequently asked questions

What specialty is Duane Westhoff?

Duane Westhoff is registered in NPPES with the primary taxonomy of Social Worker. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-02-19.