Andrew Heisler, MD

NPI 1043639933ActiveIndividual· Internal Medicine, Rheumatology· Kalamazoo, MI

Internal Medicine, Rheumatology (MD) in Kalamazoo, Michigan, trained at Loyola University of Chicago, Stritch School of Medicine (class of 2014). Their prescriptions cost Medicare Part D more than their services did: $2,289,186 for 2,442 claims, against $36,910 paid for services in 2024. Abbvie Inc. was the largest of 5 companies reporting payments in 2025, $360.82 in all, mostly food and beverage.

Overview

NPI	1043639933
Status	Active
Entity type	Individual
Credential	MD
Sole proprietor	No
NPI issued	Apr 8, 2014
Last updated in NPPES	Sep 3, 2020
Certified by provider	Sep 3, 2020

Specialties and licenses

Taxonomy	Code	License	State
Internal Medicine, Rheumatology Primary	207RR0500X	036142788	IL
Internal Medicine	207R00000X	036142788	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 - Rheumatology (MI)
Accepts assignment	Yes (participating)

Medicare services in 2024

Medicare patients	226
Services billed	866 across 11 procedure codes
Paid by Medicare	$36,910

Part D prescriptions in 2024

Prescriptions (claims)	2,442 · 5,350 30-day fills
Patients	452
Total drug cost	$2,289,186
Generic share	83% of claims

Medicare sources and data years

Education and affiliations

Medical school	Loyola University of Chicago, Stritch School of Medicine
Graduation year	2014
Medicare specialty	Rheumatology
Secondary specialties	Internal Medicine
Telehealth	Offers telehealth