DR. CLARENCE STEPHEN DENIS OD
NPI 1427822014
Optometrist in Chicago, IL
About Dr. Clarence Stephen Denis Od NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. CLARENCE STEPHEN DENIS OD (NPI 1427822014) is an individual optometrist in Chicago, Illinois, licensed in Illinois (46011839) and active in the NPI registry since November 2023. He is enrolled in Medicare PECOS and is a graduate of Midwestern University College Of Dental Medicine, Downers Grove (2023).
NPPES Registry Identity
Specialties & Licenses
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Clarence Stephen Denis Od is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
3Medicare enrollment records show Clarence Denis reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Chicago, IL 60659
- Reassigned Medicare billing, Illinois enrollment
- 27 clinicians in this Medicare group
Milwaukee, WI 53224
- Reassigned Medicare billing, Wisconsin enrollment
- 9 clinicians in this Medicare group
Indianapolis, IN 46204
- Reassigned Medicare billing, Indiana enrollment
- 8 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 60659 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 11
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Clarence Denis's NPI number?
The NPI number for Clarence Denis is 1427822014. It was assigned to this individual provider in the NPPES registry on November 14, 2023.
Where is Clarence Denis located?
Clarence Denis practices at 3500 W Peterson Ave Ste 401, Chicago, IL 60659. The listed phone number is (773) 588-3090.
What is Clarence Denis's specialty?
The primary specialty registered for this NPI is Optometrist with taxonomy code 152W00000X.
Is Clarence Denis enrolled in Medicare?
Yes. Clarence Denis is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Clarence Denis's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Clarence Denis reassigns Medicare benefits to 3 organizations: Charles S Ovitsky PC (Chicago, IL), Ovitsky Vision Care Of Wisconsin Ltd (Milwaukee, WI) and Ovitsky Vision Care Of Indiana PC (Indianapolis, IN). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Clarence Denis's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Clarence Denis accept?
Health plans from Ambetter Health, Ambetter Health of Delaware, Anthem Blue Cross and Blue Shield, Blue Cross Blue Shield of Wyoming and Blue Cross and Blue Shield of Louisiana and 4 other insurers list Clarence Denis as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for Clarence Denis was last updated on September 30, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. Clarence Stephen Denis, OD · NPI 1427822014
Optometrist provider in Chicago, Illinois. Individual provider, active in the CMS NPPES registry since November 14, 2023.
## Identity
- **NPI:** 1427822014 (Entity type: Individual)
- **Enumerated:** November 14, 2023
- **Primary specialty:** Optometrist · taxonomy 152W00000X
- **State license:** 46011839 (Illinois)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 3500 W PETERSON AVE STE 401, Chicago, IL 60659-3307
- **Phone:** (773) 588-3090
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health
- **Bills Medicare through:** 3 organizations under Medicare reassignment (form CMS-855R): Charles S Ovitsky PC (NPI 1568647220, Chicago, IL); Ovitsky Vision Care Of Wisconsin Ltd (NPI 1699262170, Milwaukee, WI); Ovitsky Vision Care Of Indiana PC (NPI 1831694330, Indianapolis, IN) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Midwestern University College Of Dental Medicine, Downers Grove, class of 2023
## Record status
- **NPPES last updated:** September 30, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1427822014) · Data from the CMS NPPES public registry.