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Leonard Leffler
NPI 1437518735 · Specialist · Brooklyn, NY
Leonard Leffler is a Specialist provider in Brooklyn, NY (NPI 1437518735).
Provider details
- NPI number
- 1437518735
- Entity type
- Individual
- Primary specialty
- SpecialistOther Service Providers
- Sex
- Male
- Sole proprietor
- Yes
Specialties & taxonomies
Other Service Providers
Profile Score
Established profile(66/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
10 yrs in NPPES registry
- Profile completeness38% of score
83% 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
1323 E 66th St
Brooklyn, NY 11234-5632
Phone: (646) 400-1661
Street-level locationGet directions
Mailing address
1323 E 66th St
Brooklyn, NY 11234-5632
Registry dates
- Enumerated
- 2016-02-15
- Last updated
- 2022-07-21
Frequently asked questions
- What is Leonard Leffler's NPI number?
- Leonard Leffler's National Provider Identifier (NPI) is 1437518735, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Leonard Leffler's specialty?
- Leonard Leffler is listed in the NPPES registry with a primary specialty of Specialist (Other Service Providers).
- Where is Leonard Leffler located?
- Leonard Leffler's practice location on file with NPPES is 1323 E 66th St, Brooklyn, NY 11234-5632.
- What is Leonard Leffler's phone number?
- The practice phone number listed in the NPPES registry for Leonard Leffler is (646) 400-1661.
- Is Leonard Leffler's NPI active?
- Yes — Leonard Leffler's NPI (1437518735) is active in the NPPES registry as of the last update on 2022-07-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.