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

William Guyler Niver, CSW

Individual provider Addiction (Substance Use Disorder) Counselor · NPI 1821318254

William Guyler Niver, CSW is an Addiction (Substance Use Disorder) Counselor in Cortland, New York. Practices as a sole proprietor. Licensed in New York.

Licensed in
NY
In the registry since
2010

Practice location Address checks out

17 Main St
Cortland, NY 13045-6606
Phone: (607) 756-4167
Fax: (607) 753-0608
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Addiction (Substance Use Disorder) Counselor (primary) Taxonomy 101YA0400X · Licence 8695 (NY)

Record details

NPI number1821318254
Entity typeIndividual (Type 1)
GenderMale
Credentials CSW
Sole proprietorYes
NPI enumeratedJune 8, 2010
Last updated in NPPESJune 8, 2010
Mailing address17 Main St, Cortland, NY 13045-6606

Other providers in Cortland