Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Michael J. Hartmann, MD

Individual provider Emergency Medicine Physician · NPI 1013073253

Michael J. Hartmann, MD is an Emergency Medicine Physician in Naperville, Illinois. Works from 2 locations. Licensed in Illinois and Wisconsin.

Licensed in
IL, WI
In the registry since
2006
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

801 S Washington St
Naperville, IL 60540-7430
Phone: (630) 527-3000
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 1000 Mineral Point Ave, Janesville, WI 53548 — (608) 756-6111

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence 036109982 (IL)
Emergency Medicine Physician Taxonomy 207P00000X · Licence 60901-20 (WI)

Record details

NPI number1013073253
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedDecember 30, 2006
Last updated in NPPESNovember 25, 2025
Certification dateNovember 25, 2025

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients459
Services billed 847 a service is one billed item, such as a visit, a test or a procedure
Average patient age75

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Other providers in Naperville