Janet Ann Greif, LCSW
Clinical Social Worker · Naperville, IL
Janet Ann Greif, LCSW is a clinical social worker with a practice address in Naperville, Illinois, and NPI 1023143351, issued on Feb 23, 2007. Check the license with the Illinois board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Janet Ann Greif
- Credential
- LCSW
- Primary taxonomy
- Clinical Social Worker 1041C0700X
- Practice location
- 1555 N Naperville Wheaton RD, Naperville, IL 60563
- Phone
- (630) 258-2133
- Enumerated
- Feb 23, 2007
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (630) 961-9830
- Medicare enrollment
- Enrolled (PECOS I20150529001498); accepts Medicare assignment
- Medical or professional school
- University Of Wisconsin School Of Medicine, 1983
- Entity
- Type 1 · individual
8 nearest clinical social worker records → All 13,637 in Illinois → Look up another NPI →
Also registered at 1555 N Naperville Wheaton RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Janet Ann Greif in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Illinois board licenses this professionCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Janet Ann Greif among 13,637 clinical social worker records in Illinois
Janet Ann Greif, LCSW is one of 13,637 clinical social worker records with a practice address in Illinois. 14% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2007, is newer than 10% of them.
- NPI issued2007 · 10% of these records are older, 80% newer
- In a Medicare fileNo · 14% of these records are
- In the CMS Doctors and Clinicians fileYes · 21% of these records are
- Graduated1983 · median 2010 among the 2,895 with a school on file
- Record last updated2007 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 1041C0700X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
307 clinical social worker records list a practice address in Naperville
They are 307 of the 4,634 NPPES records with a practice address in Naperville, and 13,637 clinical social worker records in Illinois. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 13,637 in Illinois → Every provider in Naperville → Clinical Social Worker nationwide →
The 8 clinical social worker records with the nearest ZIP codes
- Karen Bailey, LCSWNaperville, IL 605631861579120
- Christina Cal Shane, LCSWNaperville, IL 605631699888503
- Glen Cannon, LCPCNaperville, IL 605631588749550
- Laura Discipio, LCSWNaperville, IL 605631942289756
- Lisa Gray, LCSWNaperville, IL 605631831107002
- John Konny, LCSWNaperville, IL 605631992881742
- Lori Lee, LCSWNaperville, IL 605631144314691
- Christian Locke, LCSWNaperville, IL 605631407949720
Common questions
What is Janet Ann Greif, LCSW's NPI number?
Janet Ann Greif, LCSW's National Provider Identifier (NPI) is 1023143351, issued on Feb 23, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Janet Ann Greif, LCSW located?
The NPPES record lists a practice address at 1555 N Naperville Wheaton RD, Naperville, IL, 60563. Phone: (630) 258-2133. Providers update this record themselves, so call before visiting.
How can I verify Janet Ann Greif, LCSW's license?
Search the Illinois board that licenses this profession; the NPPES record confirms identity only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.