DR. KARL MICHAEL NAPEKOSKI M.D.
NPI 1235372301
Pathology - Anatomic Pathology & Clinical Pathology in Downers Grove, IL
About Dr. Karl Michael Napekoski M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. KARL MICHAEL NAPEKOSKI M.D. (NPI 1235372301) is an individual anatomic pathology & clinical pathology provider in Downers Grove, Illinois, licensed in Illinois (036.134795) and active in the NPI registry since April 2009. He is enrolled in Medicare PECOS, is affiliated with Advocate Sherman Hospital, and maintains a secondary practice location in La Grange Highlands.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
Group Practice 1
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. Karl Michael Napekoski M.d. 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
9Medicare enrollment records show Karl Napekoski reassigns Medicare billing to 9 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Downers Grove, IL 60515
- Reassigned Medicare billing, Illinois enrollment
- 1,061 clinicians in this Medicare group
La Grange Highlands, IL 60525
- Reassigned Medicare billing, Illinois enrollment
- 17 clinicians in this Medicare group
Naperville, IL 60540
- Reassigned Medicare billing, Illinois enrollment
- 16 clinicians in this Medicare group
Batavia, IL 60510
- Reassigned Medicare billing, Illinois enrollment
- 2 clinicians in this Medicare group
Park Ridge, IL 60068
- Reassigned Medicare billing, Illinois enrollment
- Medicare enrollment name: Midwest Diagnostic Pathology, S.C.
- 54 clinicians in this Medicare group
Orland Park, IL 60467
- Reassigned Medicare billing, Illinois enrollment
- 13 clinicians in this Medicare group
New Lenox, IL 60451
- Reassigned Medicare billing, Illinois enrollment
- 3 clinicians in this Medicare group
Tinley Park, IL 60477
- Reassigned Medicare billing, Illinois enrollment
- 6 clinicians in this Medicare group
Elgin, IL 60123
- Reassigned Medicare billing, Illinois enrollment
- 12 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.
Areas of Expertise CMS Part B claims 15
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 5
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Advocate Sherman Hospital
Acute Care Hospitals · Elgin, ILAdvocate Trinity Hospital
Acute Care Hospitals · Chicago, ILAdvocate Christ Hospital & Medical Center
Acute Care Hospitals · Oak Lawn, ILAdvocate Lutheran General Hospital
Acute Care Hospitals · Park Ridge, ILAdvocate Good Samaritan Hospital
Acute Care Hospitals · Downers Grove, ILPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 60515 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 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
DOWNERS GROVE, IL 60515
DOWNERS GROVE, IL 60515
DOWNERS GROVE, IL 60515
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 Karl Napekoski's NPI number?
The NPI number for Karl Napekoski is 1235372301. It was assigned to this individual provider in the NPPES registry on April 19, 2009.
Where is Karl Napekoski located?
Karl Napekoski practices at 3815 Highland Ave, Downers Grove, IL 60515. The listed phone number is (630) 275-1027.
What is Karl Napekoski's specialty?
The primary specialty registered for this NPI is Pathology, specializing in Anatomic Pathology & Clinical Pathology, with taxonomy code 207ZP0102X.
Is Karl Napekoski enrolled in Medicare?
Yes. Karl Napekoski 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 Karl Napekoski's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Karl Napekoski reassigns Medicare benefits to 9 organizations: Dupage Medical Group Ltd (Downers Grove, IL), Dermatology Associates Of Lagrange Sc (La Grange Highlands, IL), Associated Pathologists And Laboratory Physicians, LLC (Naperville, IL), Sharon L. Horton, MD, PC (Batavia, IL), Midwest Diagnostic Pathology Sc (Park Ridge, IL) and 4 more organizations, listed in the Medicare section above. 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 Karl Napekoski's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Karl Napekoski accept?
Health plans from Oscar Health and Oscar Insurance Company list Karl Napekoski 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.
Is Karl Napekoski affiliated with any hospitals?
According to CMS data, Karl Napekoski is affiliated with Advocate Sherman Hospital, Advocate Trinity Hospital, Advocate Christ Hospital & Medical Center, Advocate Lutheran General Hospital and Advocate Good Samaritan Hospital.
When was this NPI record last updated?
The NPPES record for Karl Napekoski was last updated on April 23, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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. Karl Michael Napekoski, M.D. · NPI 1235372301
Anatomic Pathology & Clinical Pathology physician in Downers Grove, Illinois. Individual provider, active in the CMS NPPES registry since April 19, 2009.
## Identity
- **NPI:** 1235372301 (Entity type: Individual)
- **Enumerated:** April 19, 2009
- **Primary specialty:** Pathology - Anatomic Pathology & Clinical Pathology · taxonomy 207ZP0102X
- **State license:** 036.134795 (Illinois)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 3815 HIGHLAND AVE, Downers Grove, IL 60515-1500
- **Phone:** (630) 275-1027
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 9 organizations under Medicare reassignment (form CMS-855R): Dupage Medical Group Ltd (NPI 1801833983, Downers Grove, IL); Dermatology Associates Of Lagrange Sc (NPI 1780795856, La Grange Highlands, IL); Associated Pathologists And Laboratory Physicians, LLC (NPI 1568903565, Naperville, IL); Sharon L. Horton, MD, PC (NPI 1962525154, Batavia, IL); Midwest Diagnostic Pathology Sc (NPI 1982606380, Park Ridge, IL); and 4 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2009
## Record status
- **NPPES last updated:** April 23, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1235372301) · Data from the CMS NPPES public registry.