IndividualActive
Mark Hennessey, LCSW-R
NPI 1427366772 · Clinical Social Worker · Brewster, NY
Mark Hennessey, LCSW-R is a Clinical Social Worker provider in Brewster, NY (NPI 1427366772).
Provider details
- NPI number
- 1427366772
- Entity type
- Individual
- Primary specialty
- Clinical Social WorkerBehavioral Health & Social Service Providers
- Credential
- LCSW-R
- Sex
- Male
- Sole proprietor
- No
- License
- 070709-1 (NY)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
Detailed profile(83/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
15 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
400 Doansburg Rd
Brewster, NY 10509-5902
Phone: (845) 279-2995
Fax: (845) 279-2077
Street-level locationGet directions
Mailing address
400 Doansburg Rd
Brewster, NY 10509-5902
Registry dates
- Enumerated
- 2010-09-21
- Last updated
- 2010-09-21
Frequently asked questions
- What is Mark Hennessey's NPI number?
- Mark Hennessey's National Provider Identifier (NPI) is 1427366772, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Hennessey's specialty?
- Mark Hennessey is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
- Where is Mark Hennessey located?
- Mark Hennessey's practice location on file with NPPES is 400 Doansburg Rd, Brewster, NY 10509-5902.
- What is Mark Hennessey's phone number?
- The practice phone number listed in the NPPES registry for Mark Hennessey is (845) 279-2995.
- Is Mark Hennessey's NPI active?
- Yes — Mark Hennessey's NPI (1427366772) is active in the NPPES registry as of the last update on 2010-09-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.