Quick answers
- Which hospitals does Ronald A. Zimmermann work at?
- Medicare's official clinician data lists Ronald A. Zimmermann at 4 hospitals: Copley Memorial Hospital, Edward Hospital, OSF Sacred Heart Medical Center and Swedish Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Ronald A. Zimmermann see patients?
- Medicare's clinician data lists 2 practice locations, including Elmhurst, IL and Danville, IL. Call before your visit to confirm the address.
- What is Ronald A. Zimmermann's specialty?
- Medicare lists Internal Medicine as the primary specialty, and also Hospitalist.
- Does Ronald A. Zimmermann accept Medicare assignment?
- Yes. Medicare's clinician data says Ronald A. Zimmermann 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 Ronald A. Zimmermann?
- (331) 221-0096, as listed in official Medicare / NPI Registry data.
- What is Ronald A. Zimmermann's NPI number?
- 1346404985. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Ronald A. Zimmermann works
Medicare's Facility Affiliation Data lists Ronald A. Zimmermann at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Copley Memorial HospitalAurora, IL · Acute Care Hospital · CCN 140029
- Edward HospitalNaperville, IL · Acute Care Hospital · CCN 140231
- OSF Sacred Heart Medical CenterDanville, IL · Acute Care Hospital · CCN 140093
- Swedish HospitalChicago, IL · Acute Care Hospital · CCN 140114
Practice locations
Addresses where Ronald A. Zimmermann is enrolled with Medicare (CMS data updated 2026-10-02).
- 155 E Brush Hill RdElmhurst, IL 60126 (331) 221‑0096
- 812 N Logan AveDanville, IL 61832 (217) 443‑5000
Group practices
Medicare enrollment lists Ronald A. Zimmermann as a member of these groups (CMS data updated 2026-10-02).
- Endeavor Health Medical Group3,350 clinicians in the group
- Sound Physicians of Illinois LLC193 clinicians in the group
Specialties
- Internal Medicineprimary
- Hospitalistalso
Other internal medicine doctors in Elmhurst
Clinicians with the same Medicare primary specialty in Elmhurst, IL — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Medical school | Lake Erie College Of Osteopathic Medicine, Erie |
| Graduation year | 2008 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1346404985 |
| 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