Individual provider · Type 1 NPI

Mark L. Collister, L.S.W.

Social Worker · Williamsport, PA

NPI number 1225078082 Active

Practice location

435 W 4th St
Williamsport, PA 17701-6001

Call (570) 322-7873 Map

Fax (570) 322-8026

Mailing address

10 Catherine Dr
Williamsport, PA 17701-1292

Specialties and licenses

TaxonomyCodeLicense
Social Worker Primary 104100000XSW124379 (PA)

Social Worker: A social worker is a person who is qualified by a Social Work degree, and licensed, certified or registered by the state as a social worker to practice within the scope of that license. A social worker provides assistance and counseling to clients and their families who are dealing with social, emotional and environmental problems. Social work services may be rendered to individuals, families, groups, and the public.

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About NPI 1225078082

Mark L. Collister, L.S.W.'s National Provider Identifier is 1225078082, issued on Jun 8, 2006. The primary taxonomy on file is Social Worker (104100000X), and the practice location is in Williamsport, PA. The record was last updated on Jul 13, 2026.