William O'Leary, LCSW
NPI 1649481912 · Clinical Social Worker · South Setauket, NY
Enrolled with Medicare as Practitioner - Clinical Social Worker · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William O'Leary, LCSW is a Clinical Social Worker provider in South Setauket, NY (NPI 1649481912).
Provider details
- NPI number
- 1649481912
- Entity type
- Individual
- Primary specialty
- Clinical Social WorkerBehavioral Health & Social Service Providers
- Credential
- LCSW
- Sex
- Male
- Sole proprietor
- Yes
- License
- 072250 (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
19 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
- 2007-05-25
- Last updated
- 2007-07-08
Frequently asked questions
- What is William O'Leary's NPI number?
- William O'Leary's National Provider Identifier (NPI) is 1649481912, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William O'Leary's specialty?
- William O'Leary is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
- Where is William O'Leary located?
- William O'Leary's practice location on file with NPPES is 3771 Nesconset Hwy, South Setauket, NY 11720-1163.
- What is William O'Leary's phone number?
- The practice phone number listed in the NPPES registry for William O'Leary is (631) 921-9138.
- Does William O'Leary accept Medicare?
- William O'Leary is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William O'Leary's NPI active?
- Yes — William O'Leary's NPI (1649481912) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.