Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

William J Ennis, DO

Individual provider Family Medicine Physician · NPI 1649225988

William J Ennis, DO is registered under Family Practice in Chicago, Illinois. Graduated from New York College of Osteo Medicine of New York Institute of Technology in 1985, 41 years ago. Practices with The Board of Trustees of the University of Illinois, a 1,142-clinician group and accepts Medicare assignment. Licensed in Illinois.

Years since qualifying
41
Trained at
New York College of Osteo Medicine of New York Institute of Technology
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.

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Practice location Address checks out

1801 W Taylor St
Chicago, IL 60612
Phone: (312) 996-3253
Fax: (312) 413-0495
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence 036084083 (IL)

Record details

NPI number1649225988
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedMay 24, 2006
Last updated in NPPESJune 16, 2018

Medicare enrollment

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

Medicare specialtyFAMILY PRACTICE
Also practisesVASCULAR SURGERY
Medical schoolNEW YORK COLLEGE OF OSTEO MEDICINE OF NEW YORK INSTITUTE OF TECHNOLOGY
Graduated 1985 (41 years in practice)
Group practice The Board Of Trustees Of The University Of Illinois — 1142 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations5 on file with Medicare

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Removal of tissue 80 times · 83rd percentile
Removal or shaving of skin growth 1–10 times
Skin biopsy 1–10 times

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

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 patients191
Services billed 821 a service is one billed item, such as a visit, a test or a procedure
Average patient age66

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 The Board of Trustees of the University of Illinois

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 1142 clinicians in the practice; 12 are shown here.

Other providers in Chicago