Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Ms. Lynn E Duffield, MSW., LCSW
Counselor in Saint Louis, MO · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1588757686
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Registry record
Entity type Individual (Type 1)
Name Ms. Lynn E Duffield
Credential MSW., LCSW
Sex Female
Practice address 8631 Delmar Blvd, Saint Louis, MO, 63124
Phone (314) 787-5100
Fax (314) 754-2800
Enumeration date Oct 2, 2006
Last updated in NPPES Jul 8, 2007
Taxonomy & licenses
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.
Frequently asked questions
What specialty is Lynn Duffield?
Lynn Duffield is registered in NPPES with the primary taxonomy of Counselor. 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.
Other providers at this practice address
Browse all → Alex Arnold Case Management Agency · St Louis, MO NPI 1841225935 Joanna Burton Case Management Agency · St Louis, MO NPI 1225063316 Lisa Ottolini Case Management Agency · Saint Louis, MO NPI 1164447611 Nancy Miller Case Management Agency · Saint Louis, MO NPI 1487679916 Julie Diaz Mental Health Counselor · Saint Louis, MO NPI 1023183159 Carol Mack Mental Health Counselor · Saint Louis, MO NPI 1356566293 Paulette Foerster Mental Health Counselor · Saint Louis, MO NPI 1386841955 Therese Jacques Counselor · Saint Louis, MO NPI 1083918296
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.