IndividualActive
Leslie Leff, MSS, LCSW
NPI 1992173074 · Social Worker · Northampton, MA
Leslie Leff, MSS, LCSW is a Social Worker provider in Northampton, MA (NPI 1992173074).
Provider details
- NPI number
- 1992173074
- Entity type
- Individual
- Primary specialty
- Social WorkerBehavioral Health & Social Service Providers
- Credential
- MSS, LCSW
- Sex
- Female
- Sole proprietor
- Yes
- License
- 220941 (MA)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
Established profile(74/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
11 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
15 Brewster Court the Children'S Clinic,
Cutchins Programs for Children and Families
Northampton, MA 01060-3801
Phone: (215) 870-3609
Street-level locationGet directions
Mailing address
15 Brewster Court the Children'S Clinic,
Northampton, MA 01060
Registry dates
- Enumerated
- 2015-09-08
- Last updated
- 2015-09-08
Frequently asked questions
- What is Leslie Leff's NPI number?
- Leslie Leff's National Provider Identifier (NPI) is 1992173074, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Leslie Leff's specialty?
- Leslie Leff is listed in the NPPES registry with a primary specialty of Social Worker (Behavioral Health & Social Service Providers).
- Where is Leslie Leff located?
- Leslie Leff's practice location on file with NPPES is 15 Brewster Court the Children'S Clinic,, Northampton, MA 01060-3801.
- What is Leslie Leff's phone number?
- The practice phone number listed in the NPPES registry for Leslie Leff is (215) 870-3609.
- Is Leslie Leff's NPI active?
- Yes — Leslie Leff's NPI (1992173074) is active in the NPPES registry as of the last update on 2015-09-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.