Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mrs. Mary Katherine Duncan, ASW
Clinical Social Worker in Chico, CA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1083774095
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Registry record
Entity type Individual (Type 1)
Name Mrs. Mary Katherine Duncan
Credential ASW
Sex Female
Practice address 7 Governors Ln, Suite 110, Chico, CA, 95926
Phone (530) 267-1718
Fax (530) 267-1775
Enumeration date Dec 11, 2006
Last updated in NPPES Jul 8, 2007
Taxonomy & licenses
1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 18386 (CA) Primary
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 18386 | Other | CA | ASSOCIATE SOCIAL WORKER |
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
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.
What specialty is Mary Duncan?
Mary Duncan is registered in NPPES with the primary taxonomy of Clinical Social Worker. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Other providers at this practice address
Browse all → Tammy Whitman Marriage & Family Therapist · Chico, CA NPI 1215029749 Lisa Weiss Marriage & Family Therapist · Chico, CA NPI 1295822773 Genesee Salamon Clinical Social Worker · Chico, CA NPI 1306998158 Pha Lor Case Manager/Care Coordinator · Chico, CA NPI 1164576195 Sharon Eschen Counselor · Chico, CA NPI 1528258225 Shan Baig Mental Health Counselor · Chico, CA NPI 1386831063 Lena Correa Clinical Social Worker · Chico, CA NPI 1184853376 Timothy Garcia Counselor · Chico, CA NPI 1851523930
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.