Quick answers
- Which hospitals does Thomas Isaacson work at?
- Medicare's official clinician data lists Thomas Isaacson at 3 hospitals: Gundersen Lutheran Medical Center, Mercy Health System Corp and Oconomowoc Memorial Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Thomas Isaacson see patients?
- Medicare's clinician data lists 3 practice locations, including Janesville, WI, Dearborn, MI and La Crosse, WI. Call before your visit to confirm the address.
- What is Thomas Isaacson's specialty?
- Medicare lists Cardiovascular Disease (Cardiology) as the primary specialty.
- Does Thomas Isaacson accept Medicare assignment?
- Yes. Medicare's clinician data says Thomas Isaacson 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 Thomas Isaacson?
- (608) 756-6000, as listed in official Medicare / NPI Registry data.
- What is Thomas Isaacson's NPI number?
- 1104884311. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Thomas Isaacson works
Medicare's Facility Affiliation Data lists Thomas Isaacson at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Gundersen Lutheran Medical CenterLa Crosse, WI · Acute Care Hospital · CCN 520087
- Mercy Health System CorpJanesville, WI · Acute Care Hospital · CCN 520066
- Oconomowoc Memorial HospitalOconomowoc, WI · Acute Care Hospital · CCN 520062
Practice locations
Addresses where Thomas Isaacson is enrolled with Medicare (CMS data updated 2026-10-02).
- 1000 Mineral Point AveJanesville, WI 53548 (608) 756‑6000
- 1213 Mason StDearborn, MI 48124 (800) 855‑6020
- 1836 S AveLa Crosse, WI 54601 (608) 783‑7300
Group practices
Medicare enrollment lists Thomas Isaacson as a member of these groups (CMS data updated 2026-10-02).
- Gundersen Lutheran Medical Center Inc895 clinicians in the group
- Mercy Health System Corporation753 clinicians in the group
- Corazon Medical PC4 clinicians in the group
Specialties
Find other Cardiovascular Disease (Cardiology) doctors in Wisconsin →
Other cardiologists in Janesville
Clinicians with the same Medicare primary specialty in Janesville, WI — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1987 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1104884311 |
| 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