NPI Portal NPI Lookup & Verification

Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

William J. Harker Lcsw, PC

Clinical Social Worker in Chester, NY · enumerated 2010 · authorized official William Harker, Owner.

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

National Provider Identifier

1275848004

Verified

See something wrong? Report a correction

Registry record

Entity type Organization (Type 2)
Legal business name William J. Harker Lcsw, PC
Practice address 105 Main St, Chester, NY, 10918
Phone (845) 469-5395
Enumeration date Aug 17, 2010
Last updated in NPPES Aug 17, 2010

Taxonomy & classification

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License PR020169 (NY) Primary

Authorized official

Name William Harker
Title Owner
Phone (845) 469-5395

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

What is a Type 2 NPI?
A Type 2 NPI identifies an organization (group practice, hospital, pharmacy, lab), while Type 1 NPIs identify individual providers. Organizations bill under their Type 2 NPI.
What type of organization is William J. Harker Lcsw, PC?
William J. Harker Lcsw, PC is registered in NPPES as a Clinical Social Worker (its primary provider taxonomy).

Providers at this address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-08-17.