Gregory D. Kaczmarek, MD

NPI 1629032958ActiveIndividual· Internal Medicine· Skokie, IL

Internal Medicine (MD) in Skokie, Illinois, trained at Loyola University of Chicago, Stritch School of Medicine (class of 1988). Their prescriptions cost Medicare Part D more than their services did: $404,095 for 5,407 claims, against $126,894 paid for services in 2024. Pfizer Inc. was the largest of 21 companies reporting payments in 2025, $2,541 in all, mostly food and beverage.

Overview

NPI	1629032958
Status	Active
Entity type	Individual
Credential	MD
Sole proprietor	Yes
NPI issued	Apr 13, 2006
Last updated in NPPES	May 12, 2008

Specialties and licenses

Taxonomy	Code	License	State
Internal Medicine Primary	207R00000X	036081697	IL

About license numbers in NPPES

Exclusion screening

List	Result	Details
HHS-OIG LEIE · Nov 10, 2026	No match	Checked by NPI and by name + state
North Carolina Medicaid · Nov 11, 2026	No match	—
New York OMIG · Nov 11, 2026	No match	—
Ohio Medicaid · Nov 11, 2026	No match	—
Pennsylvania Medicheck · Nov 11, 2026	No match	—
Washington HCA · Nov 11, 2026	No match	—

Official OIG search · How matching works ·Bulk check a roster

Medicare

Enrollment (PECOS)	Enrolled Practitioner - Internal Medicine (IL)
Accepts assignment	Yes (participating)

Medicare services in 2024

Medicare patients	421
Services billed	2,192 across 61 procedure codes
Paid by Medicare	$126,894

Part D prescriptions in 2024

Prescriptions (claims)	5,407 · 11,182 30-day fills
Patients	450
Total drug cost	$404,095
Generic share	88% of claims

Medicare sources and data years

Education and affiliations

Medical school	Loyola University of Chicago, Stritch School of Medicine
Graduation year	1988
Medicare specialty	Internal Medicine
Telehealth	Offers telehealth