Leslie Duff, L.C.S.W
NPI 1447593090 · Clinical Social Worker · Glen Ellyn, IL
Leslie Duff, L.C.S.W is a Clinical Social Worker provider in Glen Ellyn, IL (NPI 1447593090).
Provider details
- NPI number
- 1447593090
- Entity type
- Individual
- Primary specialty
- Clinical Social WorkerBehavioral Health & Social Service Providers
- Credential
- L.C.S.W
- Sex
- Female
- Sole proprietor
- Yes
- License
- 149014634 (IL)
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
13 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
- 2013-04-02
- Last updated
- 2014-07-31
Frequently asked questions
- What is Leslie Duff's NPI number?
- Leslie Duff's National Provider Identifier (NPI) is 1447593090, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Leslie Duff's specialty?
- Leslie Duff is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
- Where is Leslie Duff located?
- Leslie Duff's practice location on file with NPPES is 460 N Main St, Glen Ellyn, IL 60137-5176.
- What is Leslie Duff's phone number?
- The practice phone number listed in the NPPES registry for Leslie Duff is (847) 845-5698.
- Is Leslie Duff's NPI active?
- Yes — Leslie Duff's NPI (1447593090) is active in the NPPES registry as of the last update on 2014-07-31.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.