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

Dr. Nathan D Ontrop, MD

Individual provider Psychiatry Physician · NPI 1760778468

Dr. Nathan D Ontrop, MD is a Psychiatry in Chicago, Illinois. Graduated from Loyola University of Chicago, Stritch School of Medicine in 2011, 15 years ago. Practices with Osf Multi-Specialty Group, a 2,128-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Illinois.

Years since qualifying
15
Trained at
Loyola University of Chicago, Stritch School of Medicine
Licensed in
IL
In the registry since
2011
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

25 E Washington St Ste 1601
Chicago, IL 60602
Phone: (312) 725-2347
Fax: (312) 577-1574
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 836 W Wellington Ave, Chicago, IL 60657-5147 — (773) 296-3220

Specialties & licences

Psychiatry Physician (primary) Taxonomy 2084P0800X · Licence 036133952 (IL)
Psychiatry Physician Taxonomy 2084P0800X · Licence 125059575 (IL)

Record details

NPI number1760778468
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedJune 22, 2011
Last updated in NPPESAugust 7, 2025
Certification dateAugust 7, 2025

Medicare enrollment

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

Medicare specialtyPSYCHIATRY
Medical schoolLOYOLA UNIVERSITY OF CHICAGO, STRITCH SCHOOL OF MEDICINE
Graduated 2011 (15 years in practice)
Group practice Osf Multi-Specialty Group — 2128 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations4 on file with Medicare

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