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

Donald Tanis, MD

Individual provider Cardiovascular Disease Physician · NPI 1902822158

Donald Tanis, MD practises Interventional Cardiology in Chicago, Illinois. Qualified in 1985, 41 years ago. Practices with Loyola University Medical Center, a 946-clinician group and accepts Medicare assignment. Licensed in Illinois.

Years since qualifying
41
Licensed in
IL
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.

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Practice location Address checks out

1725 W Harrison St Ste 1159
Chicago, IL 60612-3841
Phone: (312) 942-5020
Fax: (312) 942-4039
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Adult Congenital Heart Disease Physician (primary) Taxonomy 207RA0002X · Licence 036083772 (IL)
Cardiovascular Disease Physician Taxonomy 207RC0000X · Licence 036-083772 (IL)

Record details

NPI number1902822158
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 14, 2006
Last updated in NPPESApril 22, 2026
Certification dateApril 22, 2026

Medicare enrollment

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

Medicare specialtyINTERVENTIONAL CARDIOLOGY
Also practisesCARDIOVASCULAR DISEASE (CARDIOLOGY)
Medical schoolOTHER
Graduated 1985 (41 years in practice)
Group practice Loyola University Medical Center — 946 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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.

Coronary angioplasty and stenting 1–10 times
Pacemaker insertion or repair 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 patients913
Services billed 1,408 a service is one billed item, such as a visit, a test or a procedure
Average patient age76

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 Loyola University Medical Center

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 946 clinicians in the practice; 12 are shown here.

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