IndividualActive
Leonard Marks
NPI 1033231659 · Clinical Social Worker · Brooklyn, NY
Leonard Marks is a Clinical Social Worker provider in Brooklyn, NY (NPI 1033231659).
Provider details
- NPI number
- 1033231659
- Entity type
- Individual
- Primary specialty
- Clinical Social WorkerBehavioral Health & Social Service Providers
- Sex
- Male
- Sole proprietor
- No
- License
- 024934 (NY)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
Detailed profile(89/100 index)
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
44 Court St
Suite 900
Brooklyn, NY 11201-4405
Phone: (718) 855-9890
Fax: (718) 855-3897
Street-level locationGet directions
Mailing address
189 Montague St
Brooklyn, NY 11201-3610
Registry dates
- Enumerated
- 2007-04-04
- Last updated
- 2008-01-11
Frequently asked questions
- What is Leonard Marks's NPI number?
- Leonard Marks's National Provider Identifier (NPI) is 1033231659, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Leonard Marks's specialty?
- Leonard Marks is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
- Where is Leonard Marks located?
- Leonard Marks's practice location on file with NPPES is 44 Court St, Brooklyn, NY 11201-4405.
- What is Leonard Marks's phone number?
- The practice phone number listed in the NPPES registry for Leonard Marks is (718) 855-9890.
- Is Leonard Marks's NPI active?
- Yes — Leonard Marks's NPI (1033231659) is active in the NPPES registry as of the last update on 2008-01-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.