Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mr. James Colebrook Seymour III, LCSW
Social Worker in Vallejo, CA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1366504946
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Registry record
Entity type Individual (Type 1)
Name Mr. James Colebrook Seymour III
Credential LCSW
Sex Male
Practice address 355 Tuolumne St Ste 1200, Vallejo, CA, 94590
Phone (707) 553-5816
Enumeration date Dec 14, 2006
Last updated in NPPES May 30, 2023
Taxonomy & licenses
1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 25642 (CA) Secondary
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
How do I verify James Seymour's NPI record?
Cross-check NPI 1366504946 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1366504946 active?
Yes, as of the latest NPPES snapshot, NPI 1366504946 is active (record last updated 2023-05-30).
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-05-30.