Quick answers
- Which hospitals does Michael J. Brennan work at?
- Medicare's official clinician data lists Michael J. Brennan at 3 hospitals: Advocate Christ Hospital & Medical Center, Advocate Trinity Hospital and Rush Oak Park Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Michael J. Brennan see patients?
- Medicare's clinician data lists 3 practice locations, including Kankakee, IL, Oak Lawn, IL and Oak Park, IL. Call before your visit to confirm the address.
- What is Michael J. Brennan's specialty?
- Medicare lists Critical Care (Intensivists) as the primary specialty.
- Does Michael J. Brennan accept Medicare assignment?
- Yes. Medicare's clinician data says Michael J. Brennan 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. Brennan?
- (815) 933-1671, as listed in official Medicare / NPI Registry data.
- What is Michael J. Brennan's NPI number?
- 1811550981. 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. Brennan works
Medicare's Facility Affiliation Data lists Michael J. Brennan at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Advocate Christ Hospital & Medical CenterOak Lawn, IL · Acute Care Hospital · CCN 140208
- Advocate Trinity HospitalChicago, IL · Acute Care Hospital · CCN 140048
- Rush Oak Park HospitalOak Park, IL · Acute Care Hospital · CCN 140063
Practice locations
Addresses where Michael J. Brennan is enrolled with Medicare (CMS data updated 2026-10-02).
- 350 N Wall StKankakee, IL 60901 (815) 933‑1671
- 4440 W 95th StOak Lawn, IL 60453 (708) 684‑4393
- 520 S Maple AveOak Park, IL 60304 (708) 660‑2240
Group practices
Medicare enrollment lists Michael J. Brennan as a member of these groups (CMS data updated 2026-10-02).
- Advocate Health and Hospitals Corporation3,118 clinicians in the group
- Rush University Medical Group1,551 clinicians in the group
- Riverside Emergency Physicians LLC39 clinicians in the group
- Rush Oak Park ER Physicians Group28 clinicians in the group
Specialties
- Critical Care (Intensivists)primary
Find other Critical Care (Intensivists) doctors in Illinois →
Other critical care doctors in Illinois
Clinicians with the same Medicare primary specialty in Illinois — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Medical school | Lake Erie Col Of Osteopathic Medicine, Bradenton |
| Graduation year | 2019 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1811550981 |
| 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