Janet Greif, LCSW
NPI 1023143351 · Clinical Social Worker · Naperville, IL
Enrolled with Medicare as Practitioner - Clinical Social Worker · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Janet Greif, LCSW is a Clinical Social Worker provider in Naperville, IL (NPI 1023143351).
Provider details
- NPI number
- 1023143351
- Entity type
- Individual
- Primary specialty
- Clinical Social WorkerBehavioral Health & Social Service Providers
- Credential
- LCSW
- Sex
- Female
- Sole proprietor
- Yes
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
19 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
Mailing address
Registry dates
- Enumerated
- 2007-02-23
- Last updated
- 2007-07-08
Frequently asked questions
- What is Janet Greif's NPI number?
- Janet Greif's National Provider Identifier (NPI) is 1023143351, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Janet Greif's specialty?
- Janet Greif is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
- Where is Janet Greif located?
- Janet Greif's practice location on file with NPPES is 1555 N Naperville Wheaton Rd, Naperville, IL 60563-1557.
- What is Janet Greif's phone number?
- The practice phone number listed in the NPPES registry for Janet Greif is (630) 258-2133.
- Does Janet Greif accept Medicare?
- Janet Greif is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Janet Greif's NPI active?
- Yes — Janet Greif's NPI (1023143351) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.