Alexander Leffler
NPI 1255692430 · Social Worker · Brooklyn, NY
Enrolled with Medicare as Practitioner - Clinical Social Worker · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Alexander Leffler is a Social Worker provider in Brooklyn, NY (NPI 1255692430).
Provider details
- NPI number
- 1255692430
- Entity type
- Individual
- Primary specialty
- Social WorkerBehavioral Health & Social Service Providers
- Sex
- Male
- Sole proprietor
- Yes
- License
- 086093-1 (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
14 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
- 2012-06-04
- Last updated
- 2012-06-04
Frequently asked questions
- What is Alexander Leffler's NPI number?
- Alexander Leffler's National Provider Identifier (NPI) is 1255692430, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Alexander Leffler's specialty?
- Alexander Leffler is listed in the NPPES registry with a primary specialty of Social Worker (Behavioral Health & Social Service Providers).
- Where is Alexander Leffler located?
- Alexander Leffler's practice location on file with NPPES is 1273 53rd St, Brooklyn, NY 11219-3865.
- What is Alexander Leffler's phone number?
- The practice phone number listed in the NPPES registry for Alexander Leffler is (212) 632-4400.
- Does Alexander Leffler accept Medicare?
- Alexander Leffler is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Alexander Leffler's NPI active?
- Yes — Alexander Leffler's NPI (1255692430) is active in the NPPES registry as of the last update on 2012-06-04.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.