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DAVID KORSAK
NPI 1659940492
Optometrist in Chicago, IL

Active since June 24, 2021PECOS Enrolled
845 N ASHLAND AVE, CHICAGO, IL 60622(312) 942-0407 Get Directions Write a Review

NPPES record last updated: June 24, 2021. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About David Korsak NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DAVID KORSAK (NPI 1659940492) is an individual optometrist in Chicago, Illinois, licensed in Illinois (046.011509) and active in the NPI registry since June 2021. He is enrolled in Medicare PECOS and is a graduate of Illinois College Of Optometry At Chicago (2021).

NPPES Registry Identity

NPI1659940492
Entity TypeIndividualMale
Primary Taxonomy152W00000X
Provider Legal NameDAVID KORSAK
Location Address845 N ASHLAND AVEChicago, IL 60622-5149
Mailing Address845 N Ashland AveChicago, IL 60622-5149 · (312) 942-0407
Phone(312) 942-0407
Sole ProprietorNo
Medical School CMSIllinois College Of Optometry At ChicagoGraduated 2021
Enumeration DateJune 24, 2021
NPPES CertifiedJune 24, 2021
✔ NPI 1659940492 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyOptometristEye and Vision Services Providers
Taxonomy Code152W00000X
License✔ Licensed in IL · 046.011509
Definition
Doctors of optometry (ODs) are the primary health care professionals for the eye. Optometrists examine, diagnose, treat, and manage diseases, injuries, and disorders of the visual system, the eye, and associated structures as well as identify related systemic conditions affecting the eye. An optometrist has completed pre-professional undergraduate education in a college or university and four years of professional education at a college of optometry, leading to the doctor of optometry (O.D.) degree. Some optometrists complete an optional residency in a specific area of practice. Optometrists are eye health care professionals state-licensed to diagnose and treat diseases and disorders of the eye and visual system.
845 N ASHLAND AVE, Chicago, IL 60622
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Blue Cross and Blue Shield of Louisiana, Blue Cross Blue Shield of Wyoming.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

David Korsak is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID7214334333
PECOS Enrollment IDI20251003000757
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency– Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show David Korsak reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Visionworks, Inc.
14 mi
Optometrist
239 GOLF MILL CTR, STE 255
Niles, IL 60714
  • Reassigned Medicare billing, Illinois enrollment
  • 108 clinicians in this Medicare group
NPI 1831115906 (847) 297-2286

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 60622 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$138.86 typical visit price
range $60.08 – $183.39
Typical copayment $34.71 (range $15.02 – $45.84)
Most-billed visit code 99204
Established Patient
$74.80 typical visit price
range $18.97 – $148.12
Typical copayment $18.70 (range $4.74 – $37.03)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. BRANDI STEWART OD
Optometrist
845 N ASHLAND AVE
CHICAGO, IL 60622
Cook County (312) 942-0407

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 David Korsak's NPI number?

The NPI number for David Korsak is 1659940492. It was assigned to this individual provider in the NPPES registry on June 24, 2021.

Where is David Korsak located?

David Korsak practices at 845 N Ashland Ave, Chicago, IL 60622. The listed phone number is (312) 942-0407.

What is David Korsak's specialty?

The primary specialty registered for this NPI is Optometrist with taxonomy code 152W00000X.

Is David Korsak enrolled in Medicare?

Yes. David Korsak is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for David Korsak's services?

According to the CMS Revalidation Reassignment List (October 2026 release), David Korsak reassigns Medicare benefits to Visionworks, Inc. (Niles, IL). The 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 David Korsak's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does David Korsak accept?

Health plans from Blue Cross Blue Shield of Wyoming and Blue Cross and Blue Shield of Louisiana list David Korsak 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 David Korsak was last updated on June 24, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 years 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.