Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

John B Duncan, LCSW

Clinical Social Worker in Springfield, MO · enumerated 2006 · practices at Duncan, Brown, & Associates.

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

National Provider Identifier

1730267691

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Registry record

Entity type Individual (Type 1)

Name John B Duncan

Credential LCSW

Sex Male

Practice address 604 S Pickwick Ave, Springfield, MO, 65802

Phone (417) 831-7999

Fax (417) 831-7989

Enumeration date Nov 1, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 000657 (MO) 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

Is NPI 1730267691 active?

Yes, as of the latest NPPES snapshot, NPI 1730267691 is active (record last updated 2007-07-08).

How do I verify John Duncan's NPI record?

Cross-check NPI 1730267691 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.