NPPES file of Aug 9, 2026

William Guyler Niver, CSW

Addiction (Substance Use Disorder) Counselor · Cortland, NY

William Guyler Niver, CSW is an addiction (substance use disorder) counselor with a practice address in Cortland, New York, and NPI 1821318254, issued on Jun 8, 2010. Check the license (New York 8695, as entered in NPPES) with the New York board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1821318254
Name
William Guyler Niver
Credential
CSW
Primary taxonomy
Addiction (Substance Use Disorder) Counselor 101YA0400X
License number
8695 NY
Self-reported in NPPES; status is on the state search
Practice location
17 Main St, Cortland, NY 13045
Phone
(607) 756-4167
Enumerated
Jun 8, 2010
Record last updated
Jun 8, 2010 (not updated in 16 years: call before relying on the address or phone)
Fax
(607) 753-0608
Medicaid ID
02525840 NY
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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8 nearest addiction (substance use disorder) counselor records → All 5,180 in New York → Look up another NPI →

Also registered at 17 Main St

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Melissa Bramley, LCSW-RClinical Social Worker1477662252
  2. Derrick CrowleyAddiction (Substance Use Disorder) Counselor1811289549
  3. Rebecca Dockstater, NPNurse Practitioner1952399099
  4. Kathleen Henecke, PNPPediatric Nurse Practitioner1740286608
  5. Lucinda Horn, LMHCMental Health Counselor1558409508
  6. Aaron KleinAddiction (Substance Use Disorder) Counselor1881082881

Verify William Guyler Niver in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich New York board licenses this profession
    Search for license 8695    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Find the New York license search

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William Guyler Niver among 5,180 addiction (substance use disorder) counselor records in New York

William Guyler Niver, CSW is one of 5,180 addiction (substance use disorder) counselor records with a practice address in New York. under 1% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2010, is newer than 19% of them.

  • NPI issued2010 · 19% of these records are older, 76% newer
  • In a Medicare fileNo · under 1% of these records are
  • In the CMS Doctors and Clinicians fileNo · 1% of these records are
  • Record last updated2010 · 65% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 101YA0400X and a New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

21 addiction (substance use disorder) counselor records list a practice address in Cortland

They are 21 of the 751 NPPES records with a practice address in Cortland, and 5,180 addiction (substance use disorder) counselor records in New York. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 5,180 in New York → Every provider in Cortland → Addiction (Substance Use Disorder) Counselor nationwide →

The 8 addiction (substance use disorder) counselor records with the nearest ZIP codes

  1. Jennifer Bayer, CASACCortland, NY 130451487082269
  2. Amanda Blackman, MSWCortland, NY 130451316196595
  3. Derrick CrowleyCortland, NY 130451811289549
  4. Mary Demunn, BS, CASACCortland, NY 130451639329808
  5. Martha Grazul, LPN, CASACCortland, NY 130451770893059
  6. Vickie Hadley, LMSW, CASACCortland, NY 130451215108071
  7. Peter Morse-Ackley, MS, CRC, CASACCortland, NY 130451396995965
  8. Susan Neufang, CASAC, LMSWCortland, NY 130451952550410

Common questions

What is William Guyler Niver, CSW's NPI number?

William Guyler Niver, CSW's National Provider Identifier (NPI) is 1821318254, issued on Jun 8, 2010. An NPI identifies a provider in billing; it is not a license.

Where is William Guyler Niver, CSW located?

The NPPES record lists a practice address at 17 Main St, Cortland, NY, 13045. Phone: (607) 756-4167. Providers update this record themselves, so call before visiting.

How can I verify William Guyler Niver, CSW's license?

NPPES lists New York license number 8695, as entered by the provider. Search the New York board that licenses this profession; the NPPES record confirms identity only.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.