Mark J. Charman, M.D.

NPI 1033197637ActiveIndividual· Internal Medicine· Buffalo Grove, IL

Internal Medicine (M.D.) in Buffalo Grove, Illinois, trained at University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb) (class of 1980). Their prescriptions cost Medicare Part D more than their services did: $386,634 for 2,956 claims, against $79,603 paid for services in 2024. Pfizer Inc. was the largest of 17 companies reporting payments in 2025, $1,292 in all, mostly food and beverage.

Overview

NPI	1033197637
Status	Active
Entity type	Individual
Credential	M.D.
Sole proprietor	No
NPI issued	Jan 4, 2006
Last updated in NPPES	Apr 26, 2021
Certified by provider	Apr 26, 2021

Specialties and licenses

Taxonomy	Code	License	State
Internal Medicine Primary	207R00000X	036062258	IL

About license numbers in NPPES

Exclusion screening

List	Result	Details
HHS-OIG LEIE · Oct 9, 2026	No match	Checked by NPI and by name + state
North Carolina Medicaid · Nov 10, 2026	No match	—
New York OMIG · Nov 10, 2026	No match	—
Ohio Medicaid · Nov 10, 2026	No match	—
Pennsylvania Medicheck · Nov 10, 2026	No match	—
Washington HCA · Nov 10, 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	178
Services billed	1,182 across 37 procedure codes
Paid by Medicare	$79,603

Part D prescriptions in 2024

Prescriptions (claims)	2,956 · 7,363 30-day fills
Patients	217
Total drug cost	$386,634
Generic share	83% of claims

Medicare sources and data years

Education and affiliations

Medical school	University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb)
Graduation year	1980
Medicare specialty	Internal Medicine
Telehealth	Offers telehealth