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

Dr. John Demask, DO

Individual provider Family Medicine Physician · NPI 1174501134

Dr. John Demask, DO is registered under Family Practice in Minooka, Illinois. Graduated from Chicago College of Osteopathy in 1993, 33 years ago. Accepts Medicare assignment. Licensed in Illinois.

Years since qualifying
33
Trained at
Chicago College of Osteopathy
Licensed in
IL
In the registry since
2006
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

201 S Wabena Ave
Minooka, IL 60447-8723 Not confirmed with CMS for 19 years — call before visiting
Phone: (815) 467-1518
Fax: (815) 467-7419
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

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

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence 036094869 (IL)

Record details

NPI number1174501134
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedJanuary 9, 2006
Last updated in NPPESJuly 8, 2007

Medicare enrollment

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

Medicare specialtyFAMILY PRACTICE
Medical schoolCHICAGO COLLEGE OF OSTEOPATHY
Graduated 1993 (33 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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 patients245
Services billed 1,107 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

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. Those with a page here are linked.

  • Saint Joseph Medical Center Hospital · Joliet, IL · listed as Saint Joseph Medical Center - Joliet LLC
  • Morris Hospital & Healthcare Centers Hospital · Morris, IL
  • At Home Quality Care - Morris Home health agency · Morris, IL
  • Newsome Home Health Care & Purpose Care Of Illinois - Joliet Home health agency · Joliet, IL

Other providers in Minooka