Quick answers
- Which hospitals does Michael J. Oleyar work at?
- Medicare's official clinician data lists Michael J. Oleyar at 4 hospitals: MyMichigan Medical Center Clare, MyMichigan Medical Center Midland, Northwest Community Hospital 1 and Northwestern Medicine Delnor Community Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Michael J. Oleyar see patients?
- Medicare's clinician data lists 3 practice locations, including Chicago, IL, Evanston, IL and Arlington Heights, IL. Call before your visit to confirm the address.
- What is Michael J. Oleyar's specialty?
- Medicare lists Anesthesiology as the primary specialty.
- Does Michael J. Oleyar accept Medicare assignment?
- Yes. Medicare's clinician data says Michael J. Oleyar accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Michael J. Oleyar?
- (312) 926-2280, as listed in official Medicare / NPI Registry data.
- What is Michael J. Oleyar's NPI number?
- 1386969848. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Michael J. Oleyar works
Medicare's Facility Affiliation Data lists Michael J. Oleyar at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- MyMichigan Medical Center ClareClare, MI · Acute Care Hospital · CCN 230180
- MyMichigan Medical Center MidlandMidland, MI · Acute Care Hospital · CCN 230222
- Northwest Community Hospital 1Arlington Heights, IL · Acute Care Hospital · CCN 140252
- Northwestern Medicine Delnor Community HospitalGeneva, IL · Acute Care Hospital · CCN 140211
Practice locations
Addresses where Michael J. Oleyar is enrolled with Medicare (CMS data updated 2026-10-02).
- 251 E Huron, 704 Dept of AnesChicago, IL 60611 (312) 926‑2280
- 2650 Ridge AveEvanston, IL 60201
- 800 W Central RdArlington Heights, IL 60005 (847) 618‑1000
Group practices
Medicare enrollment lists Michael J. Oleyar as a member of these groups (CMS data updated 2026-10-02).
- Northwestern Medical Faculty Foundation4,503 clinicians in the group
- Endeavor Health Medical Group3,350 clinicians in the group
Specialties
- Anesthesiologyprimary
Other anesthesiologists in Chicago
Clinicians with the same Medicare primary specialty in Chicago, IL — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Medical school | Michigan State University College Of Osteopathic Medicine |
| Graduation year | 2010 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1386969848 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians