Clarence Stephen Denis, OD
Optometrist · Chicago, IL
Clarence Stephen Denis, OD is an optometrist with a practice address in Chicago, Illinois, and NPI 1427822014, issued on Nov 14, 2023. Check the license (Illinois 46011839, as entered in NPPES) with the Illinois board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Clarence Stephen Denis
- Credential
- OD
- Primary taxonomy
- Optometrist 152W00000X
- License numbers
- 46011839 IL
OPC6780 FL
18004459A IN
Self-reported in NPPES; status is on the state search - Practice location
- 3500 W Peterson Ave Ste 401, Chicago, IL 60659
- Phone
- (773) 588-3090
- Enumerated
- Nov 14, 2023
- Record last updated
- Sep 30, 2025
- Medicare enrollment
- Enrolled (PECOS I20250814004631); accepts Medicare assignment
- Medical or professional school
- Midwestern University College Of Dental Medicine, Downers Grove, 2023
- Entity
- Type 1 · individual
8 nearest optometrist records → All 2,697 in Illinois → Look up another NPI →
Also registered at 3500 W Peterson Ave Ste 401
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Jacob Conditt, ODOptometrist1609490531
- Jessica Lee, ODOptometrist1194204578
- Maancy Mehta, O.DOptometrist1336556083
Verify Clarence Stephen Denis in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Illinois board licenses this profession
Search for license 46011839Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
94% fewer Medicare Part D claims than the average optometrist in 2024
18 Medicare Part D claims, against an average of 277 among the 33,128 providers of this specialty who prescribed in Part D.
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.
Bills Medicare through one group practice
- Charles S Ovitsky PCChicago, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Clarence Stephen Denis among 2,697 optometrist records in Illinois
Clarence Stephen Denis, OD is one of 2,697 optometrist records with a practice address in Illinois. 71% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2023, is newer than 90% of them.
- NPI issued2023 · 90% of these records are older, 7% newer
- In a Medicare fileYes · 71% of these records are
- In the CMS Doctors and Clinicians fileYes · 56% of these records are
- Graduated2023 · median 2008 among the 1,513 with a school on file
- Record last updated2025 · 68% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 152W00000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Optometrist providers in Illinois
There are 2,697 optometrist records in Illinois.
All 2,697 in Illinois → Every provider in Chicago → Optometrist nationwide →
The 8 optometrist records with the nearest ZIP codes
- Marianna Bilis, O.D.Chicago, IL 606591912976044
- Julie Bruce, O.D.Chicago, IL 606591144419847
- Jennifer Bulmann, O.D.Chicago, IL 606591811980964
- James Chikaraishi, O.D.Chicago, IL 606591376690784
- Jane Cho, O.D.Chicago, IL 606591760697379
- Ralph Gebert, ODChicago, IL 606591720151152
- Shira Gelb, O.D.Chicago, IL 606591427148915
- Justin Gordon, ODChicago, IL 606591366459711
Common questions
What is Clarence Stephen Denis, OD's NPI number?
Clarence Stephen Denis, OD's National Provider Identifier (NPI) is 1427822014, issued on Nov 14, 2023. An NPI identifies a provider in billing; it is not a license.
Where is Clarence Stephen Denis, OD located?
The NPPES record lists a practice address at 3500 W Peterson Ave Ste 401, Chicago, IL, 60659. Phone: (773) 588-3090. Providers update this record themselves, so call before visiting.
How can I verify Clarence Stephen Denis, OD's license?
NPPES lists Illinois license number 46011839, as entered by the provider. Search the Illinois board that licenses this profession; the NPPES record confirms identity only.
How much does Clarence Stephen Denis, OD prescribe under Medicare Part D?
In 2024, Clarence Stephen Denis, OD had 18 Medicare Part D claims; the average among optometrist prescribers was 277. 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.