Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Louis Christiansen
Social Worker in Eureka, CA · enumerated 2024.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1154165173
See something wrong? Report a correction
Registry record
Entity type Individual (Type 1)
Name Louis Christiansen
Sex Male
Practice address 310 F St, Eureka, CA, 95501
Phone (707) 390-0393
Enumeration date Jun 24, 2024
Last updated in NPPES Jun 9, 2026
Taxonomy & licenses
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 Louis Christiansen?
Louis Christiansen is registered in NPPES with the primary taxonomy of 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 → Tamela Christiansen Mental Health Counselor · Eureka, CA NPI 1902305279 Humboldt Counseling Connection Mental Health Clinic/Center (Including Community Mental Health Center) · Eureka, CA NPI 1710768411 Humboldt Counseling Connection Mental Health Counselor · Eureka, CA NPI 1184423386 Vanessa Laird Student in an Organized Health Care Education/Training Program · Eureka, CA NPI 1407722242
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-06-09.