Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

William J. Harker LCSW, PC

Organization Clinical Social Worker · NPI 1275848004

William J. Harker LCSW, PC is a Clinical Social Worker in Chester, New York. Licensed in New York. Registered with an NPI since 2010.

Licensed in
NY
In the registry since
2010
What do these letters mean?
PC — Professional corporation
A form of business registration, not a clinical qualification.

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Practice location Address checks out

105 Main St
Chester, NY 10918-1354
Phone: (845) 469-5395
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Clinical Social Worker (primary) Taxonomy 1041C0700X · Licence PR020169 (NY)

Record details

NPI number1275848004
Entity typeOrganization (Type 2)
Organization subpartNo
Authorized official William Harker — Owner · (845) 469-5395
NPI enumeratedAugust 17, 2010
Last updated in NPPESAugust 17, 2010
Mailing address105 Main St, Chester, NY 10918-1354

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