William Niver, CSW
NPI 1821318254 · Addiction (Substance Use Disorder) Counselor · Cortland, NY
William Niver, CSW is a Addiction (Substance Use Disorder) Counselor provider in Cortland, NY (NPI 1821318254).
Provider details
- NPI number
- 1821318254
- Entity type
- Individual
- Primary specialty
- Addiction (Substance Use Disorder) CounselorBehavioral Health & Social Service Providers
- Credential
- CSW
- Sex
- Male
- Sole proprietor
- Yes
- License
- 8695 (NY)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
16 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2010-06-08
- Last updated
- 2010-06-08
Frequently asked questions
- What is William Niver's NPI number?
- William Niver's National Provider Identifier (NPI) is 1821318254, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Niver's specialty?
- William Niver is listed in the NPPES registry with a primary specialty of Addiction (Substance Use Disorder) Counselor (Behavioral Health & Social Service Providers).
- Where is William Niver located?
- William Niver's practice location on file with NPPES is 17 Main St, Cortland, NY 13045-6606.
- What is William Niver's phone number?
- The practice phone number listed in the NPPES registry for William Niver is (607) 756-4167.
- Is William Niver's NPI active?
- Yes — William Niver's NPI (1821318254) is active in the NPPES registry as of the last update on 2010-06-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.