John Fred Cassiani, DDS
General Practice Dentistry · Downers Grove, IL
John Fred Cassiani, DDS is a general practice dentistry with a practice address in Downers Grove, Illinois, and NPI 1184820375, issued on Jun 25, 2007. Check the license (Illinois 1915958, as entered in NPPES) with the Illinois board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- John Fred Cassiani
- Credential
- DDS
- Primary taxonomy
- General Practice Dentistry 1223G0001X
- License number
- 1915958 IL
Self-reported in NPPES; status is on the state search - Practice location
- 6800 S Main St, Downers Grove, IL 60516
- Phone
- (630) 852-8855
- Enumerated
- Jun 25, 2007
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest general practice dentistry records → All 5,276 in Illinois → Look up another NPI →
Also registered at 6800 S Main St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Laura Jacobs, RDHDental Hygienist1598833014
- Lori Jepsen, RDHDental Hygienist1982772554
- Sarah Johnson, RDHDental Hygienist1689742231
- Yvonne Larose, RDHDental Hygienist1205904869
- Linda Reding, RDHDental Hygienist1730246711
- Lisa Williams, RDHDental Hygienist1205904851
Verify John Fred Cassiani in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Illinois board licenses this profession
Search for license 1915958Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
6% more Medicare Part D claims than the average general practice dentistry in 2024
88 Medicare Part D claims for 61 beneficiaries, against an average of 83 among the 70,290 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Most prescribed
- Amoxicillin65 claims
- Clindamycin Hcl16 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
John Fred Cassiani among 5,276 general practice dentistry records in Illinois
John Fred Cassiani, DDS is one of 5,276 general practice dentistry records with a practice address in Illinois. 64% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 32% of them.
- NPI issued2007 · 32% of these records are older, 43% newer
- In a Medicare fileYes · 64% of these records are
- In the CMS Doctors and Clinicians fileNo · under 1% of these records are
- Record last updated2007 · 75% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 1223G0001X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
44 general practice dentistry records list a practice address in Downers Grove
They are 44 of the 1,899 NPPES records with a practice address in Downers Grove, and 5,276 general practice dentistry records in Illinois.
All 5,276 in Illinois → Every provider in Downers Grove → General Practice Dentistry nationwide →
The 8 general practice dentistry records with the nearest ZIP codes
- Patrick Bannon, DDSDowners Grove, IL 605161881791507
- Deanne De LeonDowners Grove, IL 605161659700789
- Vincent Lin, D.D.S.Downers Grove, IL 605161760473839
- James McKee, DDSDowners Grove, IL 605161285701706
- Kevin Moss, D.M.D.Downers Grove, IL 605161437350238
- Sonia Saiz, D.D.S.Downers Grove, IL 605161588842751
- Lauren AbousslemanDowners Grove, IL 605151184440406
- Zayna Ajam, DMDDowners Grove, IL 605151588215248
Common questions
What is John Fred Cassiani, DDS's NPI number?
John Fred Cassiani, DDS's National Provider Identifier (NPI) is 1184820375, issued on Jun 25, 2007. An NPI identifies a provider in billing; it is not a license.
Where is John Fred Cassiani, DDS located?
The NPPES record lists a practice address at 6800 S Main St, Downers Grove, IL, 60516. Phone: (630) 852-8855. Providers update this record themselves, so call before visiting.
How can I verify John Fred Cassiani, DDS's license?
NPPES lists Illinois license number 1915958, as entered by the provider. Search the Illinois board that licenses this profession; the NPPES record confirms identity only.
How much does John Fred Cassiani, DDS prescribe under Medicare Part D?
In 2024, John Fred Cassiani, DDS had 88 Medicare Part D claims for 61 beneficiaries; the average among general practice dentistry prescribers was 83. Part D covers Medicare prescriptions 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.