NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

William O Arnold

Social Worker in Newark, OH · enumerated 2018.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1336638543

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name William O Arnold
Sex Male
Practice address 195 Union St Ste B1, Newark, OH, 43055
Phone (740) 349-7066
Enumeration date May 2, 2018
Last updated in NPPES May 2, 2018

Taxonomy & licenses

104100000X Social Worker Behavioral Health & Social Service Providers Primary

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.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does William Arnold practice?
The practice location on file with NPPES is in Newark, OH. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for William Arnold?
The National Provider Identifier (NPI) for William Arnold is 1336638543, 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 2018-05-02.