Kathryn Casamassimo
Clinical Social Worker · Oak Brook, IL
Kathryn Casamassimo is a clinical social worker with a practice address in Oak Brook, Illinois, and NPI 1205333531, issued on Apr 12, 2018. Check the license (Illinois 149.012427, as entered in NPPES) with the Illinois board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Kathryn Casamassimo
- Primary taxonomy
- Clinical Social Worker 1041C0700X
- License number
- 149.012427 IL
Self-reported in NPPES; status is on the state search - Practice location
- 2021 Midwest RD Ste 100C, Oak Brook, IL 60523
- Phone
- (708) 223-8405
- Enumerated
- Apr 12, 2018
- Record last updated
- Apr 12, 2018 (not updated in 8 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20250515000974); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest clinical social worker records → All 13,637 in Illinois → Look up another NPI →
Also registered at 2021 Midwest RD Ste 100C
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Tiffany Bellamy, PSYDMental Health Counselor1740816362
Verify Kathryn Casamassimo in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Illinois board licenses this profession
Search for license 149.012427Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through one group practice
- Guided Discovery Mental Health PLLCElmhurst, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Kathryn Casamassimo among 13,637 clinical social worker records in Illinois
Kathryn Casamassimo 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. Its NPI, issued in 2018, is newer than 54% of them.
- NPI issued2018 · 54% of these records are older, 41% newer
- In a Medicare fileYes · 14% of these records are
- In the CMS Doctors and Clinicians fileYes · 21% of these records are
- Graduated2004 · median 2010 among the 2,895 with a school on file
- Record last updated2018 · 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).
94 clinical social worker records list a practice address in Oak Brook
They are 94 of the 950 NPPES records with a practice address in Oak Brook, and 13,637 clinical social worker records in Illinois.
All 13,637 in Illinois → Every provider in Oak Brook → Clinical Social Worker nationwide →
The 8 clinical social worker records with the nearest ZIP codes
- Mary Anstiss, LCPCOak Brook, IL 605231508954868
- Martha Cook, M.S.W.Oak Brook, IL 605231457402810
- Deborah Fullilove, LCSWOak Brook, IL 605231306934518
- Tonya Gilkerson-Sobol, LCSWOak Brook, IL 605231447270673
- Leslie Gum, LCSWOak Brook, IL 605231437239027
- Jennifer Hassler, LCSWOak Brook, IL 605231487742557
- Ron Jordan, LCSWOak Brook, IL 605231689762767
- Hans Lonnroth, LCSWOak Brook, IL 605231518966365
Common questions
What is Kathryn Casamassimo's NPI number?
Kathryn Casamassimo's National Provider Identifier (NPI) is 1205333531, issued on Apr 12, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Kathryn Casamassimo located?
The NPPES record lists a practice address at 2021 Midwest RD Ste 100C, Oak Brook, IL, 60523. Phone: (708) 223-8405. Providers update this record themselves, so call before visiting.
How can I verify Kathryn Casamassimo's license?
NPPES lists Illinois license number 149.012427, as entered by the provider. 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. Medicare files from data.cms.gov. 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.