William O'Connor, CASAC
NPI 1538343835 · Addiction (Substance Use Disorder) Counselor · New York, NY
William O'Connor, CASAC is a Addiction (Substance Use Disorder) Counselor provider in New York, NY (NPI 1538343835).
Provider details
- NPI number
- 1538343835
- Entity type
- Individual
- Primary specialty
- Addiction (Substance Use Disorder) CounselorBehavioral Health & Social Service Providers
- Credential
- CASAC
- Sex
- Male
- Sole proprietor
- No
- License
- 18694 (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
18 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
- 2007-12-21
- Last updated
- 2007-12-21
Frequently asked questions
- What is William O'Connor's NPI number?
- William O'Connor's National Provider Identifier (NPI) is 1538343835, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William O'Connor's specialty?
- William O'Connor is listed in the NPPES registry with a primary specialty of Addiction (Substance Use Disorder) Counselor (Behavioral Health & Social Service Providers).
- Where is William O'Connor located?
- William O'Connor's practice location on file with NPPES is 2 Washington St, New York, NY 10004-1008.
- What is William O'Connor's phone number?
- The practice phone number listed in the NPPES registry for William O'Connor is (212) 425-2900.
- Is William O'Connor's NPI active?
- Yes — William O'Connor's NPI (1538343835) is active in the NPPES registry as of the last update on 2007-12-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.