Addiction Therapist

William Guyler Niver, CSW

17 Main St, Cortland, New York, 13045-6606

About William Guyler Niver

William Guyler Niver is a therapist based in Cortland, New York who is specialized in Addiction (Substance Use Disorder) Counselor. Active license number of William Guyler Niver is 8695 for Addiction (Substance Use Disorder) Counselor in New York. His current practice location is 17 Main St, Cortland. Patients can reach him at 607-756-4167 or can fax him at 607-753-0608. William Guyler Niver is CSW in Addiction (Substance Use Disorder) Counselor and his NPI number (Unique professional ID assigned by NPPES) is 1821318254.

William Guyler Niver is a licensed mental health therapist who help individuals struggling with addiction of alcohol, drug, or other substance use disorder. He helps his clients by manage and overcome the psychological, emotional, and behavioral challenges related to substance use. Counselors also work closely with families and support systems to help them better understand their loved one’s illness. SUD counselors help to promote long-term sobriety, emotional stability, and overall mental wellness for both the individual and their family.

Practice Information

William Guyler Niver speciality, credentials, practice address, contact phone number and fax are as below. Patients can call on the below given phone number for appointment.

Provider Name William Guyler Niver
Specialization Addiction (Substance Use Disorder) Counselor
Credentials CSW
Gender Male
Practice Address: 17 Main St,
Cortland, NY - 13045-6606
Fax 607-753-0608

Professional Identification Codes

NPI number stands for National Provider Identifier which is a unique 10-digit identification number issued to health care providers in the United States by the Centers for Medicare and Medicaid Services (CMS). NPI details are as mentioned below.

NPI Number1821318254
NPI Enumeration Date: 08 Jun, 2010
NPI Last Update On: 08 Jun, 2010

Medical Licenses:

Healthcare professionals can hold one or more medical licenses for different specialities in the same state or different states. Related medical licenses for William Guyler Niver are as mentioned below.

License NumberSpecializationStateStatus
8695Addiction (Substance Use Disorder) Counselor New YorkPrimary

Other Medical Identifiers

Other legacy medical identifiers associated with William Guyler Niver such as Medicaid, Medicare PIN, NSC, UPIN etc. are mentioned as below.
IdentifierTypeStateIssuer
02525840MedicaidNew York

Mailing Address

Business mailing address can be used for mailing purpose only, for visiting purpose patients need to refer above mentioned Practice address.

William Guyler Niver
17 Main St,
Cortland, NY - 13045-6606
Phone: 607-756-4167
Fax: 607-753-0608

Book an Appointment with William Guyler Niver

To schedule an appointment, contact William Guyler Niver at 17 Main St, Cortland, New York or call on below stated phone number.

Call to Book an Appointment

Frequently Asked Questions

Below are some commonly asked questions about William Guyler Niver:

William Guyler Niver is a therapist specializing in Addiction (Substance Use Disorder) Counselor. He is a licensed mental health therapist who help individuals struggling with addiction of alcohol, drug, or other substance use disorder. He helps his clients by manage and overcome the psychological, emotional, and behavioral challenges related to substance use. Counselors also work closely with families and support systems to help them better understand their loved one’s illness. SUD counselors help to promote long-term sobriety, emotional stability, and overall mental wellness for both the individual and their family.

Yes, William Guyler Niver is currently accepting new patients. To schedule an appointment, contact the office directly and schedule an appointment.

William Guyler Niver practices at 17 Main St, Cortland, New York, 13045-6606.

To schedule an appointment with William Guyler Niver, please contact the office at 607-756-4167.

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**Data of this site is collected from Medicare & Medicaid Services (CMS) and NPPES. Last updated on 14 September, 2026.