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

Dr. Stephan Andrew Olaya

Individual provider Internal Medicine Physician · NPI 1801477047

Dr. Stephan Andrew Olaya is a Hospitalist in Chicago, Illinois. Graduated from University of Maryland School of Medicine in 2021, 5 years ago. Practices with The University of Chicago Medical Center, a 909-clinician group and accepts Medicare assignment. Licensed in Illinois.

Years since qualifying
5
Trained at
University of Maryland School of Medicine
Licensed in
IL
In the registry since
2021
Specialties on file
3
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Practice location Address checks out

5841 S Maryland Ave
Chicago, IL 60637-1443
Phone: (773) 702-6840
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Hospitalist Physician (primary) Taxonomy 208M00000X · Licence 036169885 (IL)
Internal Medicine Physician Taxonomy 207R00000X · Licence 125.078276 (IL)
Student in an Organized Health Care Education/Training Program Taxonomy 390200000X

Record details

NPI number1801477047
Entity typeIndividual (Type 1)
GenderMale
Sole proprietorNo
NPI enumeratedApril 19, 2021
Last updated in NPPESJuly 10, 2024
Certification dateJuly 10, 2024

Medicare enrollment

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

Medicare specialtyHOSPITALIST
Also practisesINTERNAL MEDICINE
Medical schoolUNIVERSITY OF MARYLAND SCHOOL OF MEDICINE
Graduated 2021 (5 years in practice)
Group practice The University Of Chicago Medical Center — 909 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 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 patients74
Services billed 162 a service is one billed item, such as a visit, a test or a procedure
Average patient age71

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 University of Chicago Medical Center

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 909 clinicians in the practice; 12 are shown here.

Other providers in Chicago