Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Niels William Nielsen, LISW
Social Worker in Willoughby, OH · enumerated 2007.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1013040963
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Registry record
Entity type Individual (Type 1)
Name Niels William Nielsen
Credential LISW
Sex Male
Practice address 38879 Mentor Ave, Suite C, Willoughby, OH, 44094
Phone (440) 953-9999
Fax (440) 918-3839
Enumeration date Mar 13, 2007
Last updated in NPPES Sep 11, 2025
Taxonomy & licenses
1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License I2504 (OH) Secondary
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
Where does Niels Nielsen practice?
The practice location on file with NPPES is in Willoughby, OH. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Niels Nielsen?
The National Provider Identifier (NPI) for Niels Nielsen is 1013040963, a Type 1 (individual) record in the CMS NPPES registry.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-09-11.