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

Dr. Mark P Demus, MD

Individual provider General Acute Care Hospital · NPI 1477571479

Dr. Mark P Demus, MD practises Internal Medicine in Hoffman Estates, Illinois. Graduated from Northwestern University Feinberg Medical School in 1981, 45 years ago. Practices with Endeavor Health Medical Group, a 3,348-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Illinois.

Years since qualifying
45
Trained at
Northwestern University Feinberg Medical School
Licensed in
IL
In the registry since
2006
Specialties on file
3
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

1555 Barrington Rd
Hoffman Estates, IL 60169-1019
Phone: (847) 490-6930
Show map & directions

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

Additional practice locations (1)

  • 21481 N Rand Rd, Kildeer, IL 60047-3061 — (847) 618-9500

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence 036-065552 (IL)
General Acute Care Hospital Taxonomy 282N00000X · Licence 036065552 (IL)
General Acute Care Hospital Taxonomy 282N00000X

Record details

NPI number1477571479
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedJuly 17, 2006
Last updated in NPPESApril 28, 2021
Certification dateApril 28, 2021

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Also practisesEMERGENCY MEDICINE
Medical schoolNORTHWESTERN UNIVERSITY FEINBERG MEDICAL SCHOOL
Graduated 1981 (45 years in practice)
Group practice Endeavor Health Medical Group — 3348 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations7 on file with Medicare

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 patients639
Services billed 734 a service is one billed item, such as a visit, a test or a procedure
Average patient age77

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.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Endeavor Health Medical Group

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 3348 clinicians in the practice; 12 are shown here.

Other providers in Hoffman Estates