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

Nancy F Duncan, MSW, ACSW

Q: What is the NPI number for Nancy Duncan?

The National Provider Identifier (NPI) for Nancy Duncan is 1225213036, a Type 1 (individual) record in the CMS NPPES registry.

Counselor in Rancho Cordova, CA · enumerated 2007.

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

National Provider Identifier

1225213036

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Registry record

Entity type Individual (Type 1)

Name Nancy F Duncan

Credential MSW, ACSW

Sex Female

Practice address Rancho Cordova, CA, 95670

Phone (916) 379-2997

Enumeration date Dec 31, 2007

Last updated in NPPES Dec 31, 2007

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

Taxonomy & licenses

101Y00000X Counselor 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.

Read the full guide → Validate an NPI →

Frequently asked questions

What is the NPI number for Nancy Duncan?

The National Provider Identifier (NPI) for Nancy Duncan is 1225213036, a Type 1 (individual) record in the CMS NPPES registry.

Where does Nancy Duncan practice?

The practice location on file with NPPES is in Rancho Cordova, 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 2007-12-31.