Quick answers
- Which hospitals does Jonathan C. Tiemann work at?
- Medicare's official clinician data lists Jonathan C. Tiemann at 5 hospitals: Fort Memorial Hospital, Javon Bea Hospital, Mercy Health System Corp, Mercy Walworth Hospital & Medical Center and Mercyhealth Hospital & Physician Clinic-Crystal LA…. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Jonathan C. Tiemann see patients?
- Medicare's clinician data lists 8 practice locations, including Janesville, WI, Freeport, IL and Roscoe, IL. Call before your visit to confirm the address.
- What is Jonathan C. Tiemann's specialty?
- Medicare lists Emergency Medicine as the primary specialty.
- Does Jonathan C. Tiemann accept Medicare assignment?
- Yes. Medicare's clinician data says Jonathan C. Tiemann 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 Jonathan C. Tiemann?
- (608) 756-6000, as listed in official Medicare / NPI Registry data.
- What is Jonathan C. Tiemann's NPI number?
- 1437732708. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Jonathan C. Tiemann works
Medicare's Facility Affiliation Data lists Jonathan C. Tiemann at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Fort Memorial HospitalFort Atkinson, WI · Acute Care Hospital · CCN 520071
- Javon Bea HospitalRockford, IL · Acute Care Hospital · closed, according to its website · CCN 140239
- Mercy Health System CorpJanesville, WI · Acute Care Hospital · CCN 520066
- Mercy Walworth Hospital & Medical CenterLake Geneva, WI · Critical Access Hospital · CCN 521357
- Mercyhealth Hospital & Physician Clinic-Crystal LA…Crystal Lake, IL · Acute Care Hospital · CCN 140308
Practice locations
Addresses where Jonathan C. Tiemann is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 8; the Medicare profile lists all.
- 1000 Mineral Point AveJanesville, WI 53548 (608) 756‑6000
- 1045 W Stephenson StFreeport, IL 61032 (815) 599‑6000
- 5000 Prairie Rose DrRoscoe, IL 61073 (815) 971‑2000
- 611 Sherman Ave EFort Atkinson, WI 53538 (920) 568‑5475
- 8201 E Riverside BlvdRockford, IL 61114 (815) 971‑2000
Group practices
Medicare enrollment lists Jonathan C. Tiemann as a member of these groups (CMS data updated 2026-10-02).
- Mercy Health System Corporation753 clinicians in the group
- Rockford Health Physicians521 clinicians in the group
- Freeport Memorial Hospital178 clinicians in the group
- Swea Fort SC52 clinicians in the group
Specialties
- Emergency Medicineprimary
Other emergency medicine doctors in Janesville
Clinicians with the same Medicare primary specialty in Janesville, WI — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Medical school | Midwestern University, Chicago College Of Osteopathic Med |
| Graduation year | 2021 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1437732708 |
| 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